Phillips Petroleum Co
Phillips PActive Patents
0
Total Holdings
478
Patent Holdings
Filter in Explorer →| Patent No. | Title | Status | Filing Date | Grant Date | Claims | Actions |
|---|---|---|---|---|---|---|
| DE1085670B | Molding compound based on olefin polymers and organopolysil… | Expired / Lapsed | 1957-10-17 | — | 0 | Details |
| US5587348A | Alkyne hydrogenation catalyst and process | Expired / Lapsed | 1995-04-19 | 1996-12-24 | 35 | Details |
| US5585318A | Alkyne hydrogenation process | Expired / Lapsed | 1995-11-20 | 1996-12-17 | 21 | Details |
| US5583274A | Alkyne hydrogenation process | Expired / Lapsed | 1995-01-20 | 1996-12-10 | 20 | Details |
| US4668461A | Polymers and rotationally molding same | Expired / Lapsed | 1984-05-08 | 1987-05-26 | 11 | Details |
| US4661935A | Seismic data processing | Expired / Lapsed | 1984-09-17 | 1987-04-28 | 13 | Details |
| US4542249A | Olefin conversions and catalysts | Expired / Lapsed | 1984-05-04 | 1985-09-17 | 24 | Details |
| US4503159A | Polyolefin polymerization process and catalyst | Expired / Lapsed | 1983-08-19 | 1985-03-05 | 15 | Details |
| US4484015A | Selective hydrogenation | Expired / Lapsed | 1983-06-22 | 1984-11-20 | 11 | Details |
| US4459158A | Sulfur based metal cleaners | Expired / Lapsed | 1982-09-29 | 1984-07-10 | 12 | Details |
| US4436865A | Poly(arylene sulfide) composition suitable for molding | Expired / Lapsed | 1982-11-29 | 1984-03-13 | 10 | Details |
| US4404124A | Selective hydrogenation catalyst | Expired / Lapsed | 1981-05-06 | 1983-09-13 | 10 | Details |
| US4342550A | Method and apparatus for the reduction of flare smoke emiss… | Expired / Lapsed | 1980-04-18 | 1982-08-03 | 35 | Details |
| US4307453A | Sloping baseline compensation for a chromatographic analyzer | Expired / Lapsed | 1979-06-07 | 1981-12-22 | 10 | Details |
| US4254479A | Sonic logging method for determining the need for sand cons… | Expired / Lapsed | 1979-03-22 | 1981-03-03 | 8 | Details |
| US4171084A | Closure assembly and container sealed therewith | Expired / Lapsed | 1978-07-21 | 1979-10-16 | 17 | Details |
| US4115508A | Polymers and rotationally molding same | Expired / Lapsed | 1977-05-31 | 1978-09-19 | 25 | Details |
| US4109941A | Coupling for plastic pipe | Expired / Lapsed | 1976-06-08 | 1978-08-29 | 7 | Details |
| US4091053A | Coupled resinous diene copolymer with good integral hinge f… | Expired / Lapsed | 1976-06-24 | 1978-05-23 | 17 | Details |
| US4075158A | Flexible product made from a poly(phenylene sulfide) blend … | Expired / Lapsed | 1975-12-15 | 1978-02-21 | 8 | Details |
| US4070044A | Polymer pipe connection and method to make it | Expired / Lapsed | 1976-01-22 | 1978-01-24 | 7 | Details |
| US4068720A | Method for acidizing subterranean formations | Expired / Lapsed | 1975-12-24 | 1978-01-17 | 24 | Details |
| US4039029A | Retreatment of wells to reduce water production | Expired / Lapsed | 1975-11-06 | 1977-08-02 | 11 | Details |
| US4013824A | Mixing of organosulfur molecular weight modifier with emuls… | Expired / Lapsed | 1974-11-18 | 1977-03-22 | 14 | Details |
| US3989787A | Method of rotational molding a thermosetting article with a… | Expired / Lapsed | 1975-07-28 | 1976-11-02 | 10 | Details |
| US3940972A | Chromatographic separation of olefins | Expired / Lapsed | 1974-06-28 | 1976-03-02 | 19 | Details |
| US3903201A | Suspension polymerization process | Expired / Lapsed | 1972-11-15 | 1975-09-02 | 24 | Details |
| US3886636A | Yarn processing | Expired / Lapsed | 1973-05-24 | 1975-06-03 | 9 | Details |
| US3884873A | Arylene sulfide polymer cured with the aid of certain compo… | Expired / Lapsed | 1973-11-29 | 1975-05-20 | 10 | Details |
| US3869417A | Modification of asphalt with ethylene-vinyl acetate copolym… | Expired / Lapsed | 1971-02-16 | 1975-03-04 | 11 | Details |
| US3857852A | Crackle finish coating of arylene sulfide polymer containin… | Expired / Lapsed | 1972-10-19 | 1974-12-31 | 10 | Details |
| US3856735A | Incorporation of high molecular weight fluorocarbon polymer… | Expired / Lapsed | 1972-10-19 | 1974-12-24 | 8 | Details |
| US3848549A | Two-stage smokeless incinerator with fluidized bed first st… | Expired / Lapsed | 1973-05-11 | 1974-11-19 | 23 | Details |
| US3843881A | Detection of elements by irradiating material and measuring… | Expired / Lapsed | 1973-01-11 | 1974-10-22 | 11 | Details |
| US3821349A | Internal cooling of polyethylene terephthalate tubing | Expired / Lapsed | 1972-06-15 | 1974-06-28 | 8 | Details |
| US3811263A | Non-twisted, heather yarn and method for producing same | Expired / Lapsed | 1972-02-23 | 1974-05-21 | 14 | Details |
| US3801690A | Closing mold halves on stretched portion of individual pari… | Expired / Lapsed | 1972-02-16 | 1974-04-02 | 0 | Details |
| US3786982A | Thermoformed snap closures | Expired / Lapsed | 1971-11-17 | 1974-01-22 | 9 | Details |
| US3785437A | Method for controlling formation permeability | Expired / Lapsed | 1972-10-04 | 1974-01-15 | 17 | Details |
| US3778872A | Method and apparatus for texturing yarn | Expired / Lapsed | 1971-04-12 | 1973-12-18 | 12 | Details |
| US3778490A | Polar compound adjuvants for improved block polymers prepar… | Expired / Lapsed | 1971-06-25 | 1973-12-11 | 0 | Details |
| US3751914A | Process and apparatus for improving the removal of harmful … | Expired / Lapsed | 1971-09-27 | 1973-08-14 | 7 | Details |
| US3721253A | Controlling apparatus and method | Expired / Lapsed | 1971-09-24 | 1973-03-20 | 12 | Details |
| US3684447A | Producing hydrogen by contact of steam with iron oxide prom… | Expired / Lapsed | 1970-10-06 | 1972-08-15 | 0 | Details |
| US3678547A | Yarn texturing | Expired / Lapsed | 1970-11-06 | 1972-07-25 | 17 | Details |
| US3663514A | Light-stable polyurethane coatings | Expired / Lapsed | 1970-04-09 | 1972-05-16 | 0 | Details |
| US3650001A | Yarn texturing apparatus | Expired / Lapsed | 1970-12-24 | 1972-03-21 | 11 | Details |
| US3638916A | Method and apparatus for blending materials | Expired / Lapsed | 1970-09-01 | 1972-02-01 | 4 | Details |
| US3630905A | Oil-extended vi improvers | Expired / Lapsed | 1968-11-19 | 1971-12-28 | 0 | Details |
| US3622376A | TiO{11 {0 IN POLY(ARYLENE SULFIDE) FOR COATING COMPOSITION | Expired / Lapsed | 1968-08-15 | 1971-11-23 | 11 | Details |
| US3618447A | Deterioration fasteners | Expired / Lapsed | 1969-09-15 | 1971-11-09 | 0 | Details |
| US3607987A | Coating composition comprising polyethylene and a visbroken… | Expired / Lapsed | 1967-07-20 | 1971-09-21 | 5 | Details |
| US3598181A | Oil recovery employing viscosifiers produced by the action … | Expired / Lapsed | 1970-02-17 | 1971-08-10 | 5 | Details |
| US3598799A | Lactone copolymers | Expired / Lapsed | 1969-12-10 | 1971-08-10 | 0 | Details |
| US3579618A | High speed fibrillation process | Expired / Lapsed | 1968-08-09 | 1971-05-18 | 0 | Details |
| US3565281A | Container | Expired / Lapsed | 1968-12-11 | 1971-02-23 | 5 | Details |
| US3555135A | Stress relieving of molded plastic structures | Expired / Lapsed | 1968-02-29 | 1971-01-12 | 0 | Details |
| US3554911A | Viscosity index improvers | Expired / Lapsed | 1967-11-30 | 1971-01-12 | 0 | Details |
| US3553130A | Oil recovery | Expired / Lapsed | 1968-05-20 | 1971-01-05 | 0 | Details |
| US3523345A | Yarn texturing method | Expired / Lapsed | 1967-12-18 | 1970-08-11 | 0 | Details |
| US3522337A | Method and apparatus for contacting the interior surface of… | Expired / Lapsed | 1968-04-26 | 1970-07-28 | 0 | Details |
| US3513319A | Refractometer having spaced light conducting rods | Expired / Lapsed | 1968-02-19 | 1970-05-19 | 0 | Details |
| US3497572A | High impact resin compositions | Expired / Lapsed | 1967-08-24 | 1970-02-24 | 0 | Details |
| US3496258A | Method of polymer molding | Expired / Lapsed | 1966-08-25 | 1970-02-17 | 0 | Details |
| US3491935A | Method of forming a peelable seal | Expired / Lapsed | 1966-08-08 | 1970-01-27 | 0 | Details |
| US3468994A | Dimethylsulfoxide in solvent system for polyolefin coating … | Expired / Lapsed | 1966-06-27 | 1969-09-23 | 0 | Details |
| US3462582A | Parison heating | Expired / Lapsed | 1967-02-07 | 1969-08-19 | 0 | Details |
| US3459824A | Removal of contaminants from unsaturated hydrocarbon-contai… | Expired / Lapsed | 1968-03-04 | 1969-08-05 | 0 | Details |
| US3457781A | Modified dynamometer | Expired / Lapsed | 1966-08-29 | 1969-07-29 | 0 | Details |
| US3456722A | Thermal-operated valve | Expired / Lapsed | 1966-12-29 | 1969-07-22 | 0 | Details |
| US3449479A | Method for coating the interior surface of a polyolefin art… | Expired / Lapsed | 1966-06-17 | 1969-06-10 | 0 | Details |
| US3439622A | Motor control circuit utilizing a voltage controlled rectif… | Expired / Lapsed | 1966-09-02 | 1969-04-22 | 0 | Details |
| US3424733A | Method and apparatus for handling of a fluid | Expired / Lapsed | 1963-04-16 | 1969-01-28 | 2 | Details |
| US3419369A | Manufacturing town gas from liquefied natural gas | Expired / Lapsed | 1965-03-19 | 1968-12-31 | 0 | Details |
| US3410394A | Packaging articles with heat shrinkable tubing | Expired / Lapsed | 1964-10-16 | 1968-11-12 | 0 | Details |
| US3409828A | Apparatus for testing electrical circuit boards | Expired / Lapsed | 1964-10-30 | 1968-11-05 | 0 | Details |
| US3406986A | Conduit coupling | Expired / Lapsed | 1967-06-16 | 1968-10-22 | 0 | Details |
| US3401400A | Apparatus for color display of seismic data | Expired / Lapsed | 1966-10-20 | 1968-09-10 | 0 | Details |
| US3399542A | Method and apparatus for cooling compressor recycle gas | Expired / Lapsed | 1967-05-25 | 1968-09-03 | 0 | Details |
| US3400041A | Pre-stretched plastic films | Expired / Lapsed | 1964-07-06 | 1968-09-03 | 2 | Details |
| US3392753A | Apparatus for blending of additives into fluid streams | Expired / Lapsed | 1966-01-03 | 1968-07-16 | 0 | Details |
| US3388425A | Apparatus for coating the interior surfaces of hollow shape… | Expired / Lapsed | 1963-11-14 | 1968-06-18 | 2 | Details |
| US3377404A | Polymerization method | Expired / Lapsed | 1964-10-06 | 1968-04-09 | 2 | Details |
| US3365593A | Piezoelectric transducers | Expired / Lapsed | 1965-10-21 | 1968-01-23 | 2 | Details |
| US3354129A | Production of polymers from aromatic compounds | Expired / Lapsed | 1963-11-27 | 1967-11-21 | 3 | Details |
| US3352944A | Blend of butadiene-styrene block copolymer with cis-polybut… | Expired / Lapsed | 1964-01-03 | 1967-11-14 | 0 | Details |
| US3351084A | Fluid level controller | Expired / Lapsed | 1964-12-04 | 1967-11-07 | 2 | Details |
| US3347729A | Apparatus for sealing thermoplastic materials including a r… | Expired / Lapsed | 1964-10-23 | 1967-10-17 | 2 | Details |
| US3348032A | Digital computer set point control system | Expired / Lapsed | 1963-07-11 | 1967-10-17 | 2 | Details |
| US3343598A | Protection of production well equipment in in situ combusti… | Expired / Lapsed | 1965-02-03 | 1967-09-26 | 2 | Details |
| US3338810A | Ultraviolet light reaction between an alkyl polythiol and a… | Expired / Lapsed | 1964-10-05 | 1967-08-29 | 3 | Details |
| US3337666A | Method of blow molding oriented containers | Expired / Lapsed | 1965-01-04 | 1967-08-22 | 2 | Details |
| US3334691A | Apparatus for shutting off water during air drilling | Expired / Lapsed | 1964-11-06 | 1967-08-08 | 2 | Details |
| US3333760A | Carrier | Expired / Lapsed | 1966-07-11 | 1967-08-01 | 2 | Details |
| US3323978A | Artificial textile fibres and their production | Expired / Lapsed | 1963-05-09 | 1967-06-06 | 1 | Details |
| US3322613A | Laminated sheet material | Expired / Lapsed | 1963-02-11 | 1967-05-30 | 3 | Details |
| US3318102A | Vapor-liquid mixing to control refrigerating temperature in… | Expired / Lapsed | 1964-08-24 | 1967-05-09 | 2 | Details |
| US3310505A | Production of thermoplastic materials | Expired / Lapsed | 1963-03-11 | 1967-03-21 | 2 | Details |
| US3308073A | Porous polyolefin objects | Expired / Lapsed | 1962-04-09 | 1967-03-07 | 2 | Details |
| US3303402A | Single phase induction motor | Expired / Lapsed | 1964-01-09 | 1967-02-07 | 2 | Details |
| US3293341A | Heat treatment of hollow-shaped structures | Expired / Lapsed | 1963-11-12 | 1966-12-20 | 2 | Details |
| US3293542A | Electrical well logging apparatus including a drill collar … | Expired / Lapsed | 1963-03-18 | 1966-12-20 | 2 | Details |
| US3286510A | Drilling mud test apparatus and process | Expired / Lapsed | 1964-05-18 | 1966-11-22 | 2 | Details |
| US3256902A | Automatic chemical injection control | Expired / Lapsed | 1961-10-30 | 1966-06-21 | 2 | Details |
| US3250825A | Blends of crystalline polyethylene or ethylene-butene copol… | Expired / Lapsed | 1962-11-09 | 1966-05-10 | 1 | Details |
| US3250757A | Method and apparatus for controlling feed to a polymerizati… | Expired / Lapsed | 1961-05-18 | 1966-05-10 | 2 | Details |
| US3248325A | Lubricating composition | Expired / Lapsed | 1964-08-21 | 1966-04-26 | 2 | Details |
| US3247703A | Automatic zeroing system | Expired / Lapsed | 1963-05-20 | 1966-04-26 | 1 | Details |
| US3247290A | Extrusion coating resin comprising a blend of low density p… | Expired / Lapsed | 1961-07-13 | 1966-04-19 | 2 | Details |
| US3245466A | Breaking oil-in-water emulsions and removal of solid matter… | Expired / Lapsed | 1962-08-03 | 1966-04-12 | 2 | Details |
| US3242720A | Apparatus for determining rheological properties | Expired / Lapsed | 1963-09-30 | 1966-03-29 | 2 | Details |
| US3235508A | Catalyst compositions and method for their preparation | Expired / Lapsed | 1962-03-19 | 1966-02-15 | 4 | Details |
| US3223738A | Cyclododecadienyl mercaptans and thioethers | Expired / Lapsed | 1963-03-15 | 1965-12-14 | 2 | Details |
| US3223630A | Increasing the base number of calcium petroleum sulfonate | Expired / Lapsed | 1961-10-09 | 1965-12-14 | 2 | Details |
| US3219803A | Electrical measuring apparatus | Expired / Lapsed | 1962-01-08 | 1965-11-23 | 2 | Details |
| US3218445A | Signal multiplier where one signal to be multiplied causes … | Expired / Lapsed | 1962-01-29 | 1965-11-16 | 1 | Details |
| US3217828A | Seismic prospecting | Expired / Lapsed | 1962-01-12 | 1965-11-16 | 2 | Details |
| US3216434A | Additive injection system | Expired / Lapsed | 1962-01-02 | 1965-11-09 | 1 | Details |
| US3217289A | Signal analysis | Expired / Lapsed | 1961-08-18 | 1965-11-09 | 2 | Details |
| US3215028A | Means and method for restricting a solid propellant | Expired / Lapsed | 1959-07-09 | 1965-11-02 | 2 | Details |
| US3214074A | Container provided with cover seal and removable inner lid | Expired / Lapsed | 1963-09-03 | 1965-10-26 | 2 | Details |
| US3211223A | Underwater well completion | Expired / Lapsed | 1961-12-26 | 1965-10-12 | 2 | Details |
| US3210296A | Supported noble metal catalyst | Expired / Lapsed | 1963-05-24 | 1965-10-05 | 0 | Details |
| US3196123A | Polymer surfaces enhanced for printing by addition of epoxi… | Expired / Lapsed | 1962-01-05 | 1965-07-20 | 2 | Details |
| US3193978A | Heat sealing thermoplastic packages | Expired / Lapsed | 1962-01-22 | 1965-07-13 | 1 | Details |
| US3188258A | Bonding of olefin polymers | Expired / Lapsed | 1957-12-30 | 1965-06-08 | 1 | Details |
| US3174298A | Process controller | Expired / Lapsed | 1962-01-02 | 1965-03-23 | 1 | Details |
| US3168193A | Formed container multipack | Expired / Lapsed | 1962-08-20 | 1965-02-02 | 2 | Details |
| US3166609A | Blends of trans-polybutadiene with rubber | Expired / Lapsed | 1960-11-21 | 1965-01-19 | 2 | Details |
| US3165563A | Method for the production of a fibrous material | Expired / Lapsed | 1960-06-22 | 1965-01-12 | 2 | Details |
| US3157604A | Polymerization initiators | Expired / Lapsed | 1960-10-24 | 1964-11-17 | 2 | Details |
| US3152301A | Electrical measuring apparatus | Expired / Lapsed | 1961-09-22 | 1964-10-06 | 1 | Details |
| US3146146A | Use of ionizing radiation to improve polymer-metal laminates | Expired / Lapsed | 1961-07-11 | 1964-08-25 | 2 | Details |
| US3139468A | Altering dimension of vulcanized transpolybutadiene and hea… | Expired / Lapsed | 1960-06-20 | 1964-06-30 | 2 | Details |
| US3135716A | Process for preparing terminally reactive polymers | Expired / Lapsed | 1958-11-06 | 1964-06-02 | 6 | Details |
| US3133437A | Measuring the water content in oil and water mixtures | Expired / Lapsed | 1961-05-22 | 1964-05-19 | 2 | Details |
| US3132194A | Preparation of microporous filamentous articles | Expired / Lapsed | 1962-04-09 | 1964-05-05 | 2 | Details |
| US3131521A | Heat sealing thermoplastic packages | Expired / Lapsed | 1961-03-23 | 1964-05-05 | 0 | Details |
| US3121160A | Electrical measuring apparatus | Expired / Lapsed | 1961-11-13 | 1964-02-11 | 2 | Details |
| US3119995A | Timing apparatus | Expired / Lapsed | 1962-02-20 | 1964-01-28 | 2 | Details |
| US3119992A | Dead time system for analog computer | Expired / Lapsed | 1958-10-30 | 1964-01-28 | 1 | Details |
| US3115245A | Formed container with paper label | Expired / Lapsed | 1961-03-27 | 1963-12-24 | 2 | Details |
| US3113831A | Method of forming a double-walled container | Expired / Lapsed | 1961-01-26 | 1963-12-10 | 2 | Details |
| US3112880A | Furnace control | Expired / Lapsed | 1962-11-21 | 1963-12-03 | 1 | Details |
| US3108324A | Method and means for manufacture of biaxially oriented ther… | Expired / Lapsed | 1960-11-10 | 1963-10-29 | 1 | Details |
| US3108929A | Fluid analyzer for control system | Expired / Lapsed | 1960-01-15 | 1963-10-29 | 2 | Details |
| US3105493A | Suture | Expired / Lapsed | 1960-04-21 | 1963-10-01 | 2 | Details |
| US3105896A | Measurement and control of polymerization reactions | Expired / Lapsed | 1957-12-04 | 1963-10-01 | 2 | Details |
| US3103036A | Method and apparatus for producing double-walled containers | Expired / Lapsed | 1961-05-29 | 1963-09-10 | 4 | Details |
| US3102050A | Method of coating particulated resinous material by polymer… | Expired / Lapsed | 1960-04-21 | 1963-08-27 | 2 | Details |
| US3099366A | Loading terminal metering system | Expired / Lapsed | 1961-10-19 | 1963-07-30 | 1 | Details |
| US3094875A | Low level voltage to frequency converter | Expired / Lapsed | 1961-09-29 | 1963-06-25 | 2 | Details |
| US3090683A | Control of absorber product | Expired / Lapsed | 1960-07-12 | 1963-05-21 | 2 | Details |
| US3087844A | Solid composite propellants containing aziridinyl curing ag… | Expired / Lapsed | 1959-07-24 | 1963-04-30 | 2 | Details |
| US3086958A | Blends of high pressure type polyethylene with cracked high… | Expired / Lapsed | 1958-11-17 | 1963-04-23 | 2 | Details |
| US3084489A | Method of sealing thermoplastic film overwrap | Expired / Lapsed | 1959-12-28 | 1963-04-09 | 2 | Details |
| US3078254A | High molecular polymers and method for their preparation | Expired / Lapsed | 1959-07-20 | 1963-02-19 | 2 | Details |
| US3070309A | Voltage-sensitive capacitor bridge multiplier | Expired / Lapsed | 1961-09-20 | 1962-12-25 | 0 | Details |
| US3070777A | Ghost elimination | Expired / Lapsed | 1959-01-02 | 1962-12-25 | 0 | Details |
| US3060989A | Blends of cis-polybutadiene with either natural rubber or c… | Expired / Lapsed | 1959-08-17 | 1962-10-30 | 3 | Details |
| US3056162A | Apparatus for polishing wet pelleted carbon black | Expired / Lapsed | 1959-02-02 | 1962-10-02 | 2 | Details |
| US3056265A | Underground storage | Expired / Lapsed | 1958-06-16 | 1962-10-02 | 0 | Details |
| US3054406A | Surgical mesh | Expired / Lapsed | 1958-10-17 | 1962-09-18 | 0 | Details |
| US3051037A | Differential refractometer | Expired / Lapsed | 1957-12-26 | 1962-08-28 | 0 | Details |
| US3050482A | Reaction product of a polyhydroxy compound and a polyisocya… | Expired / Lapsed | 1959-08-03 | 1962-08-21 | 2 | Details |
| US3049908A | Programmer-integrator for chromatographic analyzer | Expired / Lapsed | 1958-08-15 | 1962-08-21 | 0 | Details |
| US3050513A | Process and catalyst for production of rubbery polymers | Expired / Lapsed | 1956-04-20 | 1962-08-21 | 2 | Details |
| US3044236A | System for removal of gases from liquids | Expired / Lapsed | 1960-07-21 | 1962-07-17 | 0 | Details |
| US3043128A | Analyzer | Expired / Lapsed | 1958-09-17 | 1962-07-10 | 0 | Details |
| US3040833A | Seismic exploration | Expired / Lapsed | 1957-01-14 | 1962-06-26 | 0 | Details |
| US3039309A | Pneumatically actuated pump and sampling system | Expired / Lapsed | 1957-09-13 | 1962-06-19 | 0 | Details |
| US3035809A | Self-lubricating compressible slide gate | Expired / Lapsed | 1960-03-18 | 1962-05-22 | 2 | Details |
| US3036045A | Polymer compositions and improved process for vulcanization… | Expired / Lapsed | 1955-07-05 | 1962-05-22 | 2 | Details |
| US3032729A | Temperature stable transformer | Expired / Lapsed | 1957-05-16 | 1962-05-01 | 0 | Details |
| US3030346A | Production of block copolymers | Expired / Lapsed | 1960-03-18 | 1962-04-17 | 2 | Details |
| US3025234A | Well drilling fluid and process | Expired / Lapsed | 1957-09-03 | 1962-03-13 | 2 | Details |
| US3022541A | Producing indicia in film by modification of film opacity | Expired / Lapsed | 1960-02-05 | 1962-02-27 | 2 | Details |
| US3021568A | Injection molding of plastic materials | Expired / Lapsed | 1958-10-15 | 1962-02-20 | 0 | Details |
| US3022209A | Method of welding butted pipe sections of polyethylene to f… | Expired / Lapsed | 1956-11-23 | 1962-02-20 | 2 | Details |
| US3022322A | Process for the production of epoxidized polybutadiene | Expired / Lapsed | 1956-09-28 | 1962-02-20 | 2 | Details |
| US3019486A | Method of making plastic hinge | Expired / Lapsed | 1957-12-20 | 1962-02-06 | 2 | Details |
| US3019649A | Metering system for liquids | Expired / Lapsed | 1957-08-16 | 1962-02-06 | 0 | Details |
| US3016970A | Interpretation of seismic records | Expired / Lapsed | 1958-11-17 | 1962-01-16 | 0 | Details |
| US3015085A | Seismic signal interpretation apparatus | Expired / Lapsed | 1956-06-18 | 1961-12-26 | 0 | Details |
| US3013926A | Process of preparing coated, laminated, and sized articles … | Expired / Lapsed | 1958-01-30 | 1961-12-19 | 2 | Details |
| US3011872A | Carbon black furnace fluid injector | Expired / Lapsed | 1958-01-28 | 1961-12-05 | 4 | Details |
| US3011931A | Composite rubber article | Expired / Lapsed | 1957-03-27 | 1961-12-05 | 2 | Details |
| US3003106A | Measurement of b.s. and w. in oil | Expired / Lapsed | 1958-03-17 | 1961-10-03 | 0 | Details |
| US3002818A | Process control system | Expired / Lapsed | 1956-11-28 | 1961-10-03 | 2 | Details |
| US2997432A | Dyeing of 1-olefin polymers | Expired / Lapsed | 1958-08-14 | 1961-08-22 | 2 | Details |
| US2985826A | Electrical measuring apparatus | Expired / Lapsed | 1959-11-19 | 1961-05-23 | 0 | Details |
| US2985469A | Snap-fit plastic pipe joint | Expired / Lapsed | 1957-09-09 | 1961-05-23 | 0 | Details |
| US2985596A | Finely powdered chromia-alumina dehydrogenation catalyst an… | Expired / Lapsed | 1953-06-22 | 1961-05-23 | 0 | Details |
| US2983771A | Conversion of hydrocarbons | Expired / Lapsed | 1957-12-02 | 1961-05-09 | 4 | Details |
| US2982910A | Test circuit | Expired / Lapsed | 1958-06-05 | 1961-05-02 | 0 | Details |
| US2974227A | Analyzer | Expired / Lapsed | 1958-05-07 | 1961-03-07 | 0 | Details |
| US2974017A | Measurement of polymerization reractions | Expired / Lapsed | 1957-11-21 | 1961-03-07 | 2 | Details |
| US2973638A | Engine analysis apparatus | Expired / Lapsed | 1955-07-14 | 1961-03-07 | 0 | Details |
| US2973241A | Method for producing high crystalline 1-olefin polymers of … | Expired / Lapsed | 1956-10-26 | 1961-02-28 | 1 | Details |
| US2972716A | Analytical instrument utilizing ionization and selective ev… | Expired / Lapsed | 1955-07-07 | 1961-02-21 | 0 | Details |
| US2970259A | Flame detector | Expired / Lapsed | 1951-04-23 | 1961-01-31 | 0 | Details |
| US2966232A | Process and apparatus for separating finely divided solids … | Expired / Lapsed | 1958-05-02 | 1960-12-27 | 0 | Details |
| US2965562A | Hydrocracking hydrocarbon oils with a catalyst composite, c… | Expired / Lapsed | 1957-12-09 | 1960-12-20 | 1 | Details |
| US2960038A | Bellows pump | Expired / Lapsed | 1955-04-18 | 1960-11-15 | 0 | Details |
| US2954470A | Mass spectrometer and method | Expired / Lapsed | 1957-04-12 | 1960-09-27 | 0 | Details |
| US2952874A | Air ring for use in the manufacture of thermoplastic tubing | Expired / Lapsed | 1958-05-19 | 1960-09-20 | 2 | Details |
| US2953659A | Shut-down device | Expired / Lapsed | 1955-05-16 | 1960-09-20 | 0 | Details |
| US2952576A | Glass fiber treated with the reaction product of a liquid p… | Expired / Lapsed | 1955-11-02 | 1960-09-13 | 4 | Details |
| US2951816A | Polymerization catalyst and production thereof | Expired / Lapsed | 1958-01-06 | 1960-09-06 | 2 | Details |
| US2948919A | Method and apparatus for producing extruded pipe under inte… | Expired / Lapsed | 1957-10-28 | 1960-08-16 | 0 | Details |
| US2945678A | Bottom hole drilling fluid control valve | Expired / Lapsed | 1957-02-21 | 1960-07-19 | 0 | Details |
| US2940071A | Analog to digital converter | Expired / Lapsed | 1956-01-16 | 1960-06-07 | 0 | Details |
| US2940061A | Signal recording system | Expired / Lapsed | 1955-10-24 | 1960-06-07 | 0 | Details |
| US2934647A | Optical analyzer | Expired / Lapsed | 1956-10-22 | 1960-04-26 | 0 | Details |
| US2928697A | Pivoted valve structure | Expired / Lapsed | 1957-01-14 | 1960-03-15 | 0 | Details |
| US2927904A | Method of foaming blend of crystalline 1-olefin polymer and… | Expired / Lapsed | 1956-11-19 | 1960-03-08 | 2 | Details |
| US2926409A | Snap friction locking device | Expired / Lapsed | 1957-09-23 | 1960-03-01 | 0 | Details |
| US2926331A | Seismic exploration | Expired / Lapsed | 1957-02-04 | 1960-02-23 | 0 | Details |
| US2923151A | Extracting and analyzing gas from well drilling mud | Expired / Lapsed | 1956-12-17 | 1960-02-02 | 0 | Details |
| US2921738A | Polynomial multiplier | Expired / Lapsed | 1955-04-18 | 1960-01-19 | 0 | Details |
| US2920483A | Positive displacement meter | Expired / Lapsed | 1954-08-12 | 1960-01-12 | 0 | Details |
| US2920266A | Electrical well logging | Expired / Lapsed | 1956-08-08 | 1960-01-05 | 0 | Details |
| US2920064A | Process for halogenation of polymers | Expired / Lapsed | 1954-07-29 | 1960-01-05 | 2 | Details |
| US2917374A | Process and apparatus for carbon black handling and pelleti… | Expired / Lapsed | 1957-08-26 | 1959-12-15 | 2 | Details |
| US2917077A | Excess flow check valve | Expired / Lapsed | 1953-11-09 | 1959-12-15 | 0 | Details |
| US2913448A | Treatment of polymers | Expired / Lapsed | 1956-05-25 | 1959-11-17 | 2 | Details |
| US2910139A | Drying of gases | Expired / Lapsed | 1957-04-03 | 1959-10-27 | 1 | Details |
| US2910461A | Continuous process for the production of high molecular wei… | Expired / Lapsed | 1956-05-14 | 1959-10-27 | 2 | Details |
| US2908889A | Computer | Expired / Lapsed | 1955-12-16 | 1959-10-13 | 0 | Details |
| US2904846A | Method for coating filamentous articles | Expired / Lapsed | 1956-12-31 | 1959-09-22 | 2 | Details |
| US2904751A | Electrical measuring apparatus | Expired / Lapsed | 1953-08-27 | 1959-09-15 | 0 | Details |
| US2900998A | Check valve | Expired / Lapsed | 1955-12-01 | 1959-08-25 | 0 | Details |
| US2901210A | Electro-magnetic device | Expired / Lapsed | 1953-06-29 | 1959-08-25 | 0 | Details |
| US2893692A | Vibratory impact tool | Expired / Lapsed | 1955-01-03 | 1959-07-07 | 0 | Details |
| US2891239A | Angular position telemetering system | Expired / Lapsed | 1954-04-09 | 1959-06-16 | 0 | Details |
| US2888089A | Seismic exploration | Expired / Lapsed | 1956-09-27 | 1959-05-26 | 0 | Details |
| US2888436A | Polyfunctional polymeric products | Expired / Lapsed | 1955-02-18 | 1959-05-26 | 1 | Details |
| US2884068A | Kick shoe for wash pipe | Expired / Lapsed | 1956-06-18 | 1959-04-28 | 0 | Details |
| US2884074A | Deep well casing orifice and check valve | Expired / Lapsed | 1953-06-17 | 1959-04-28 | 0 | Details |
| US2881235A | Process control method and apparatus | Expired / Lapsed | 1957-03-20 | 1959-04-07 | 4 | Details |
| US2879665A | Detonation meter | Expired / Lapsed | 1955-12-19 | 1959-03-31 | 0 | Details |
| US2874356A | Method of and apparatus for seismic prospecting | Expired / Lapsed | 1952-04-02 | 1959-02-17 | 0 | Details |
| US2872072A | Control system | Expired / Lapsed | 1955-05-16 | 1959-02-03 | 0 | Details |
| US2872588A | Analyzer | Expired / Lapsed | 1953-11-16 | 1959-02-03 | 0 | Details |
| US2870113A | Method for producing finely divided solid 1-olefin polymer | Expired / Lapsed | 1955-04-06 | 1959-01-20 | 2 | Details |
| US2867848A | Heat-stress cracking resistance of thermoplastic filamentou… | Expired / Lapsed | 1956-11-23 | 1959-01-13 | 2 | Details |
| US2868855A | Conversion of hydrocarbons | Expired / Lapsed | 1954-10-18 | 1959-01-13 | 4 | Details |
| US2866790A | Catalyst and dehydrogenation process | Expired / Lapsed | 1957-02-18 | 1958-12-30 | 4 | Details |
| US2866836A | Process and apparatus for conversion of hydrocarbons | Expired / Lapsed | 1954-10-22 | 1958-12-30 | 4 | Details |
| US2857803A | Differential refractometer cell | Expired / Lapsed | 1956-03-12 | 1958-10-28 | 0 | Details |
| US2857799A | Differential refractometer | Expired / Lapsed | 1952-01-02 | 1958-10-28 | 0 | Details |
| US2855100A | Fractional crystallization process and apparatus | Expired / Lapsed | 1954-12-31 | 1958-10-07 | 2 | Details |
| US2855449A | Method of and apparatus for the acid-catalyzed alkylation o… | Expired / Lapsed | 1954-03-12 | 1958-10-07 | 4 | Details |
| US2853575A | Flow-responsive device | Expired / Lapsed | 1955-05-09 | 1958-09-23 | 0 | Details |
| US2853209A | Container | Expired / Lapsed | 1955-01-13 | 1958-09-23 | 0 | Details |
| US2852091A | Separating means for aerated mud drilling | Expired / Lapsed | 1957-04-03 | 1958-09-16 | 0 | Details |
| US2851504A | Selective removal of acetylene from olefin and/or diolefin … | Expired / Lapsed | 1954-09-03 | 1958-09-09 | 2 | Details |
| US2845410A | Fractionation of polymers | Expired / Lapsed | 1954-10-01 | 1958-07-29 | 2 | Details |
| US2845409A | Catalyst regeneration | Expired / Lapsed | 1953-09-18 | 1958-07-29 | 2 | Details |
| US2844568A | Indicating and/or control system and method | Expired / Lapsed | 1955-10-10 | 1958-07-22 | 2 | Details |
| US2839149A | Method of and apparatus for multiplying and integrating var… | Expired / Lapsed | 1950-05-19 | 1958-06-17 | 0 | Details |
| US2837960A | Differential refractometer | Expired / Lapsed | 1955-05-09 | 1958-06-10 | 0 | Details |
| US2837007A | Differential refractometer cell | Expired / Lapsed | 1953-05-28 | 1958-06-03 | 1 | Details |
| US2835746A | Amplifier with automatic volume control | Expired / Lapsed | 1952-04-07 | 1958-05-20 | 0 | Details |
| US2832759A | Process and catalyst for production of olefin polymers | Expired / Lapsed | 1955-12-16 | 1958-04-29 | 2 | Details |
| US2826738A | Electrical measuring apparatus | Expired / Lapsed | 1956-03-21 | 1958-03-11 | 0 | Details |
| US2825721A | Polymers and production thereof | Expired / Lapsed | 1956-03-26 | 1958-03-04 | 2 | Details |
| US2823243A | Process and apparatus for pyrolysis of hydrocarbons | Expired / Lapsed | 1956-03-19 | 1958-02-11 | 4 | Details |
| US2817691A | Catalyst regeneration analysis and control | Expired / Lapsed | 1953-09-24 | 1957-12-24 | 2 | Details |
| US2812932A | Constant fuel-air ratio device | Expired / Lapsed | 1953-12-28 | 1957-11-12 | 0 | Details |
| US2810315A | Differential refractometer cell assembly | Expired / Lapsed | 1953-05-11 | 1957-10-22 | 0 | Details |
| US2809815A | Scraped surface chiller | Expired / Lapsed | 1954-12-20 | 1957-10-15 | 0 | Details |
| US2809098A | Carbon black process and apparatus | Expired / Lapsed | 1955-10-03 | 1957-10-08 | 4 | Details |
| US2807523A | Pelleting of carbon black | Expired / Lapsed | 1954-04-12 | 1957-09-24 | 4 | Details |
| US2806744A | Straightening vanes in pebble heater air lift | Expired / Lapsed | 1954-12-03 | 1957-09-17 | 0 | Details |
| US2806144A | Infrared analyzer | Expired / Lapsed | 1953-09-15 | 1957-09-10 | 1 | Details |
| US2805311A | Temperature measurement and control | Expired / Lapsed | 1953-05-04 | 1957-09-03 | 0 | Details |
| US2800394A | Method of and apparatus for controlling carbon black furnac… | Expired / Lapsed | 1955-04-11 | 1957-07-23 | 4 | Details |
| US2800399A | Process for controlling feed rate to pellet mill | Expired / Lapsed | 1954-08-09 | 1957-07-23 | 2 | Details |
| US2799165A | Apparatus for measuring flow | Expired / Lapsed | 1953-08-24 | 1957-07-16 | 2 | Details |
| US2799758A | Electrical temperature indicating device | Expired / Lapsed | 1951-09-24 | 1957-07-16 | 2 | Details |
| US2792501A | Analyzer | Expired / Lapsed | 1953-12-30 | 1957-05-14 | 0 | Details |
| US2788267A | Cyclone separator feeder and method for feeding carbon black | Expired / Lapsed | 1954-01-13 | 1957-04-09 | 4 | Details |
| US2787906A | Apparatus for determining temperature conditions in a well | Expired / Lapsed | 1952-06-30 | 1957-04-09 | 0 | Details |
| US2787125A | Underground storage system | Expired / Lapsed | 1952-11-13 | 1957-04-02 | 0 | Details |
| US2786351A | Flowmeter | Expired / Lapsed | 1954-08-09 | 1957-03-26 | 0 | Details |
| US2785356A | Transducer | Expired / Lapsed | 1955-06-13 | 1957-03-12 | 0 | Details |
| US2785212A | Regenerative furnace and production of unsaturated hydrocar… | Expired / Lapsed | 1954-11-29 | 1957-03-12 | 4 | Details |
| US2781247A | Carbon black process | Expired / Lapsed | 1954-01-29 | 1957-02-12 | 2 | Details |
| US2779703A | Fungicidal mercury tertiary butyl mercaptide compositions a… | Expired / Lapsed | 1950-06-19 | 1957-01-29 | 1 | Details |
| US2773795A | Rubber-fabric laminates and method of making same | Expired / Lapsed | 1953-01-05 | 1956-12-11 | 4 | Details |
| US2769341A | Pressure balance indicator | Expired / Lapsed | 1952-06-02 | 1956-11-06 | 0 | Details |
| US2769811A | Production of alkenyl pyridines | Expired / Lapsed | 1951-08-30 | 1956-11-06 | 2 | Details |
| US2764692A | Analyzer | Expired / Lapsed | 1952-08-11 | 1956-09-25 | 0 | Details |
| US2764536A | Differential analyzer and control system | Expired / Lapsed | 1951-09-17 | 1956-09-25 | 2 | Details |
| US2750420A | Conversion of hydrocarbons | Expired / Lapsed | 1953-04-29 | 1956-06-12 | 4 | Details |
| US2747840A | Apparatus for developing underwater reservoirs | Expired / Lapsed | 1953-06-12 | 1956-05-29 | 2 | Details |
| US2742784A | Flow meter | Expired / Lapsed | 1952-12-29 | 1956-04-24 | 0 | Details |
| US2742756A | Temperature measurement and override control for turbojet e… | Expired / Lapsed | 1951-06-04 | 1956-04-24 | 4 | Details |
| US2741917A | Flowmeter | Expired / Lapsed | 1952-10-13 | 1956-04-17 | 2 | Details |
| US2742227A | Electrical computer for solving simultaneous equations | Expired / Lapsed | 1952-01-02 | 1956-04-17 | 0 | Details |
| US2730910A | Air actuated control system | Expired / Lapsed | 1954-10-25 | 1956-01-17 | 0 | Details |
| US2728836A | Temperature sensing element | Expired / Lapsed | 1951-06-07 | 1955-12-27 | 0 | Details |
| US2720510A | Procedure for manufacture of synthetic rubber | Expired / Lapsed | 1951-10-26 | 1955-10-11 | 2 | Details |
| US2720594A | Multi-component infrared analyzer | Expired / Lapsed | 1951-01-02 | 1955-10-11 | 2 | Details |
| US2718449A | Pulse measuring apparatus | Expired / Lapsed | 1949-09-23 | 1955-09-20 | 0 | Details |
| US2718145A | Surface indicating bottom-hole pressure measuring device | Expired / Lapsed | 1949-09-16 | 1955-09-20 | 2 | Details |
| US2712415A | Optical computer | Expired / Lapsed | 1954-04-28 | 1955-07-05 | 0 | Details |
| US2707524A | Seismic recording system | Expired / Lapsed | 1950-07-31 | 1955-05-03 | 0 | Details |
| US2703493A | Flowmeter | Expired / Lapsed | 1949-12-19 | 1955-03-08 | 0 | Details |
| US2703491A | Strain measuring instrument | Expired / Lapsed | 1949-10-21 | 1955-03-08 | 0 | Details |
| US2701832A | Moisture-sensitive element | Expired / Lapsed | 1951-11-09 | 1955-02-08 | 2 | Details |
| US2699836A | Separation of gases by diffusion | Expired / Lapsed | 1951-10-15 | 1955-01-18 | 0 | Details |
| US2697984A | Well control device | Expired / Lapsed | 1949-12-08 | 1954-12-28 | 0 | Details |
| US2696464A | Method and apparatus for controlling the separation of conj… | Expired / Lapsed | 1949-01-27 | 1954-12-07 | 2 | Details |
| US2696475A | Method of preparation of supported nickel, cobalt, or coppe… | Expired / Lapsed | 1948-11-12 | 1954-12-07 | 2 | Details |
| US2691300A | Torque computer | Expired / Lapsed | 1951-12-17 | 1954-10-12 | 0 | Details |
| US2691573A | Desulfurization in the gasification of coal | Expired / Lapsed | 1950-12-15 | 1954-10-12 | 2 | Details |
| US2691303A | Magnetic type flowmeter | Expired / Lapsed | 1950-06-19 | 1954-10-12 | 0 | Details |
| US2688875A | Airplane fuel gauge | Expired / Lapsed | 1951-04-16 | 1954-09-14 | 0 | Details |
| US2688009A | Solid reaction product of a liquid polymerized diene and me… | Expired / Lapsed | 1951-01-02 | 1954-08-31 | 2 | Details |
| US2685649A | Analyzer | Expired / Lapsed | 1952-10-29 | 1954-08-03 | 2 | Details |
| US2684838A | Process of dispensing a soluble fluid to a liquid and syste… | Expired / Lapsed | 1952-01-02 | 1954-07-27 | 0 | Details |
| US2684575A | Submergible type offshore drilling structure | Expired / Lapsed | 1950-12-22 | 1954-07-27 | 0 | Details |
| US2679205A | Method of and apparatus for producing seismic waves | Expired / Lapsed | 1949-02-18 | 1954-05-25 | 1 | Details |
| US2676196A | Electrical transducing element | Expired / Lapsed | 1953-02-27 | 1954-04-20 | 2 | Details |
| US2674440A | Process for drilling wells, including dialysis of the drill… | Expired / Lapsed | 1951-02-26 | 1954-04-06 | 0 | Details |
| US2674321A | Low water-loss cement slurry | Expired / Lapsed | 1949-12-19 | 1954-04-06 | 2 | Details |
| US2673297A | Analyzing and control device | Expired / Lapsed | 1949-06-13 | 1954-03-23 | 0 | Details |
| US2667109A | Camera assembly for photographing cavity walls | Expired / Lapsed | 1950-10-09 | 1954-01-26 | 0 | Details |
| US2666583A | Thermoresponsive color change control device | Expired / Lapsed | 1951-09-07 | 1954-01-19 | 0 | Details |
| US2666734A | Apparatus for conversion of residual oils | Expired / Lapsed | 1950-06-12 | 1954-01-19 | 2 | Details |
| US2666854A | Recording system | Expired / Lapsed | 1950-04-10 | 1954-01-19 | 0 | Details |
| US2666086A | Preparation of iron dehydrogenation catalysts | Expired / Lapsed | 1949-11-14 | 1954-01-12 | 3 | Details |
| US2663765A | Noise suppression device | Expired / Lapsed | 1949-03-07 | 1953-12-22 | 0 | Details |
| US2663379A | Apparatus for hydrocarbon determination | Expired / Lapsed | 1948-05-10 | 1953-12-22 | 0 | Details |
| US2659064A | Rotational seismometer | Expired / Lapsed | 1949-08-19 | 1953-11-10 | 0 | Details |
| US2658180A | Vacuum tube voltmeter | Expired / Lapsed | 1950-04-10 | 1953-11-03 | 0 | Details |
| US2657700A | Method of and apparatus for segregating fluids transported … | Expired / Lapsed | 1949-11-14 | 1953-11-03 | 0 | Details |
| US2654433A | Packing device | Expired / Lapsed | 1949-02-21 | 1953-10-06 | 0 | Details |
| US2653294A | Apparatus for electrical well logging | Expired / Lapsed | 1949-04-21 | 1953-09-22 | 0 | Details |
| US2651995A | Switch for automatic pumping units | Expired / Lapsed | 1951-10-23 | 1953-09-15 | 0 | Details |
| US2650496A | Fluid flowmeter with heated resistance bridge circuit | Expired / Lapsed | 1948-05-17 | 1953-09-01 | 0 | Details |
| US2645949A | Pressure balance indicator | Expired / Lapsed | 1949-05-09 | 1953-07-21 | 0 | Details |
| US2643093A | Air actuated control system | Expired / Lapsed | 1948-07-24 | 1953-06-23 | 0 | Details |
| US2641044A | Process for manufacturing mullitecontaining refractories | Expired / Lapsed | 1949-10-24 | 1953-06-09 | 2 | Details |
| US2641535A | Treatment of furnace blacks | Expired / Lapsed | 1949-04-14 | 1953-06-09 | 2 | Details |
| US2641741A | Crystal controlled modulated oscillator | Expired / Lapsed | 1949-02-21 | 1953-06-09 | 0 | Details |
| US2640269A | Liquid level indicator | Expired / Lapsed | 1949-12-30 | 1953-06-02 | 0 | Details |
| US2638578A | Seismometer | Expired / Lapsed | 1952-02-11 | 1953-05-12 | 0 | Details |
| US2637207A | Magnetic flowmeter | Expired / Lapsed | 1949-10-31 | 1953-05-05 | 0 | Details |
| US2637839A | Rotational seismometer | Expired / Lapsed | 1948-04-20 | 1953-05-05 | 0 | Details |
| US2636383A | Well bore measuring and fluid metering device | Expired / Lapsed | 1948-01-23 | 1953-04-28 | 0 | Details |
| US2634398A | Method of eliminating an undesired component of seismic wav… | Expired / Lapsed | 1950-11-24 | 1953-04-07 | 0 | Details |
| US2632713A | Carbon black process | Expired / Lapsed | 1948-10-29 | 1953-03-24 | 2 | Details |
| US2625537A | Diazothioethers in emulsion polymerization | Expired / Lapsed | 1947-06-02 | 1953-01-13 | 2 | Details |
| US2622442A | Apparatus for measuring liquid levels | Expired / Lapsed | 1949-06-10 | 1952-12-23 | 0 | Details |
| US2617587A | Computer component | Expired / Lapsed | 1949-12-20 | 1952-11-11 | 0 | Details |
| US2616795A | Process for producing carbon black | Expired / Lapsed | 1950-09-15 | 1952-11-04 | 2 | Details |
| US2614166A | Method for determining the direction of arrival of waves | Expired / Lapsed | 1950-04-24 | 1952-10-14 | 0 | Details |
| US2601632A | Producing an improved synthetic rubber from a multicomponen… | Expired / Lapsed | 1949-11-25 | 1952-06-24 | 2 | Details |
| US2599975A | Apparatus and method for measuring the velocity of fluids | Expired / Lapsed | 1948-11-08 | 1952-06-10 | 2 | Details |
| US2599775A | Electrostatic seismometer | Expired / Lapsed | 1948-07-01 | 1952-06-10 | 0 | Details |
| US2595524A | Apparatus for controlling internal-combustion engines | Expired / Lapsed | 1945-07-19 | 1952-05-06 | 0 | Details |
| US2591053A | Leak compensated capacitor | Expired / Lapsed | 1947-07-24 | 1952-04-01 | 0 | Details |
| US2591060A | Excess flow control valve | Expired / Lapsed | 1946-03-09 | 1952-04-01 | 0 | Details |
| US2590396A | Regulator | Expired / Lapsed | 1945-12-26 | 1952-03-25 | 0 | Details |
| US2584809A | Computer for solving simultaneous equations | Expired / Lapsed | 1949-08-01 | 1952-02-05 | 0 | Details |
| US2582647A | Method and means for indicating changes in the composition … | Expired / Lapsed | 1949-01-04 | 1952-01-15 | 4 | Details |
| US2574006A | Method of recovering hydrogen fluoride in an alkylation pro… | Expired / Lapsed | 1947-10-17 | 1951-11-06 | 2 | Details |
| US2570951A | Pipe-line scraper signaling system | Expired / Lapsed | 1948-12-31 | 1951-10-09 | 0 | Details |
| US2569550A | Tube socket for printed circuits | Expired / Lapsed | 1948-12-20 | 1951-10-02 | 0 | Details |
| US2569563A | Centrifugal pump | Expired / Lapsed | 1946-06-10 | 1951-10-02 | 0 | Details |
| US2564700A | Production of carbon black | Expired / Lapsed | 1947-04-25 | 1951-08-21 | 2 | Details |
| US2563085A | Process for removing solid polymeric material from process … | Expired / Lapsed | 1948-01-02 | 1951-08-07 | 1 | Details |
| US2562148A | Low water-loss cement slurry | Expired / Lapsed | 1949-07-11 | 1951-07-24 | 0 | Details |
| US2560455A | Thermocouple return bend and well | Expired / Lapsed | 1949-05-26 | 1951-07-10 | 0 | Details |
| US2556799A | Heteropolymerization of sulfur dioxide and an unsaturated o… | Expired / Lapsed | 1949-04-28 | 1951-06-12 | 2 | Details |
| US2554414A | Apparatus for determining a chemically reactive gas | Expired / Lapsed | 1945-07-12 | 1951-05-22 | 2 | Details |
| US2551666A | Continuous removal of impurities from refrigerant during a … | Expired / Lapsed | 1948-05-24 | 1951-05-08 | 0 | Details |
| US2552362A | Telegraph receiving circuit | Expired / Lapsed | 1946-01-31 | 1951-05-08 | 0 | Details |
| US2551160A | Internal insulation of vessels | Expired / Lapsed | 1945-02-05 | 1951-05-01 | 0 | Details |
| US2547970A | Controlling heating valve of natural gas | Expired / Lapsed | 1948-02-28 | 1951-04-10 | 2 | Details |
| US2546570A | Fluidizied bed reactor | Expired / Lapsed | 1948-11-15 | 1951-03-27 | 2 | Details |
| US2544734A | Automatic filler | Expired / Lapsed | 1947-07-14 | 1951-03-13 | 0 | Details |
| US2539843A | Container testing device | Expired / Lapsed | 1946-04-15 | 1951-01-30 | 0 | Details |
| US2534489A | Automatic sampler of liquid and gas phase streams | Expired / Lapsed | 1945-07-02 | 1950-12-19 | 0 | Details |
| US2534005A | Detonation meter | Expired / Lapsed | 1945-11-19 | 1950-12-12 | 0 | Details |
| US2532613A | Hydrocarbon conversion in pebble heaters | Expired / Lapsed | 1946-07-08 | 1950-12-05 | 2 | Details |
| US2531403A | Process for coagulating a latex of a sulfur dioxide resin | Expired / Lapsed | 1949-07-08 | 1950-11-28 | 2 | Details |
| US2525818A | Production of nitriles | Expired / Lapsed | 1946-06-24 | 1950-10-17 | 2 | Details |
| US2522787A | Method of and apparatus for liquefying gases | Expired / Lapsed | 1948-06-11 | 1950-09-19 | 0 | Details |
| US2519378A | Apparatus for measuring viscosity | Expired / Lapsed | 1946-04-26 | 1950-08-22 | 0 | Details |
| US2518307A | Automatic control of catalyst promoter in a hydrocarbon con… | Expired / Lapsed | 1946-11-04 | 1950-08-08 | 2 | Details |
| US2516152A | Process for isomerizing para alkyl phenols to ortho alkyl p… | Expired / Lapsed | 1946-03-26 | 1950-07-25 | 2 | Details |
| US2503361A | Carbon black pelleting | Expired / Lapsed | 1945-04-23 | 1950-04-11 | 2 | Details |
| US2502525A | Controlled cycle relief valve | Expired / Lapsed | 1944-07-05 | 1950-04-04 | 0 | Details |
| US2496338A | Detonation indicator circuit and method | Expired / Lapsed | 1945-01-18 | 1950-02-07 | 0 | Details |
| US2492848A | Temporary protective coating | Expired / Lapsed | 1946-09-30 | 1949-12-27 | 0 | Details |
| US2490985A | Olefin sulfide addition products | Expired / Lapsed | 1948-07-26 | 1949-12-13 | 0 | Details |
| US2489394A | Variable flow gas sampling method and apparatus | Expired / Lapsed | 1945-12-18 | 1949-11-29 | 0 | Details |
| US2487863A | Tank car unloading system | Expired / Lapsed | 1946-07-01 | 1949-11-15 | 0 | Details |
| US2486627A | Conversion of hydrocarbons | Expired / Lapsed | 1946-04-01 | 1949-11-01 | 0 | Details |
| US2479772A | Method of and apparatus for geophysical exploration | Expired / Lapsed | 1948-07-29 | 1949-08-23 | 0 | Details |
| US2479612A | Closure assembly | Expired / Lapsed | 1945-08-31 | 1949-08-23 | 0 | Details |
| US2472070A | Pressure controlled liquid outlet valve | Expired / Lapsed | 1946-04-15 | 1949-06-07 | 0 | Details |
| US2453456A | Instrument for measuring water flow in wells | Expired / Lapsed | 1945-03-07 | 1948-11-09 | 0 | Details |
| US2450500A | Synthesis of hydrocarbons | Expired / Lapsed | 1945-09-05 | 1948-10-05 | 0 | Details |
| US2450352A | Seismic wave correction means and method | Expired / Lapsed | 1944-07-25 | 1948-09-28 | 0 | Details |
| US2448322A | Detonation meter | Expired / Lapsed | 1943-09-20 | 1948-08-31 | 0 | Details |
| US2438518A | Circuit for measuring voltage of an alternating source | Expired / Lapsed | 1944-07-25 | 1948-03-30 | 0 | Details |
| US2437290A | Method for manufacturing anhydrous hci | Expired / Lapsed | 1943-08-09 | 1948-03-09 | 0 | Details |
| US2435545A | Process for the production of mercaptans | Expired / Lapsed | 1944-09-28 | 1948-02-03 | 0 | Details |
| US2432873A | Means of pebble heater control | Expired / Lapsed | 1947-08-25 | 1947-12-16 | 0 | Details |
| US2430246A | Automatic volume control for seismograph amplifiers | Expired / Lapsed | 1944-07-25 | 1947-11-04 | 0 | Details |
| US2429297A | Vibration absorber | Expired / Lapsed | 1945-11-05 | 1947-10-21 | 0 | Details |
| US2425752A | Separation of hydrogen fluoride from water and organic cont… | Expired / Lapsed | 1944-09-15 | 1947-08-19 | 0 | Details |
| US2422859A | Production of nitriles of unsaturated acids | Expired / Lapsed | 1944-05-04 | 1947-06-24 | 0 | Details |
| US2415003A | Purification of hydrofluoric acid | Expired / Lapsed | 1943-12-11 | 1947-01-28 | 0 | Details |
| US2413871A | Process of removing organically combined chlorine from hydr… | Expired / Lapsed | 1945-07-24 | 1947-01-07 | 0 | Details |
| US2408842A | Automatic cylinder filling device | Expired / Lapsed | 1942-06-22 | 1946-10-08 | 0 | Details |
| US2406263A | Automatic container filling device | Expired / Lapsed | 1944-12-05 | 1946-08-20 | 0 | Details |
| US2404835A | Crosshead | Expired / Lapsed | 1945-01-22 | 1946-07-30 | 0 | Details |
| US2404622A | Well logging apparatus | Expired / Lapsed | 1942-03-10 | 1946-07-23 | 0 | Details |
| US2402355A | Dispensing system | Expired / Lapsed | 1941-06-26 | 1946-06-18 | 0 | Details |
| US2394220A | Level control and indicator of interface between acid and h… | Expired / Lapsed | 1944-05-19 | 1946-02-05 | 0 | Details |
| US2393857A | Hydrocarbon conversion | Expired / Lapsed | 1942-12-05 | 1946-01-29 | 0 | Details |
| US2390270A | Method of surface prospecting | Expired / Lapsed | 1942-01-05 | 1945-12-04 | 0 | Details |
| US2385378A | Well surveying | Expired / Lapsed | 1942-06-11 | 1945-09-25 | 0 | Details |
| US2379633A | Gas proportioning system | Expired / Lapsed | 1942-05-01 | 1945-07-03 | 0 | Details |
| US2377245A | Process for producing acetylene | Expired / Lapsed | 1943-12-03 | 1945-05-29 | 0 | Details |
| US2376051A | Removal of light hydrocarbons from admixture with hydrogen … | Expired / Lapsed | 1942-08-06 | 1945-05-15 | 0 | Details |
| US2374518A | Catalytic process | Expired / Lapsed | 1943-04-09 | 1945-04-24 | 0 | Details |
| US2374151A | Catalytic conversion and regeneration system | Expired / Lapsed | 1943-03-15 | 1945-04-17 | 0 | Details |
| US2373358A | Catalytic process and apparatus | Expired / Lapsed | 1943-12-31 | 1945-04-10 | 0 | Details |
| US2373280A | Nonthrusting pipe expansion joint | Expired / Lapsed | 1943-07-06 | 1945-04-10 | 0 | Details |
| US2370817A | Method and apparatus for treating drilling fluid | Expired / Lapsed | 1941-02-13 | 1945-03-06 | 0 | Details |
| US2369238A | Electrical circuit | Expired / Lapsed | 1944-02-16 | 1945-02-13 | 0 | Details |
| US2365751A | Process for hydrogenating hydrocarbon oils | Expired / Lapsed | 1941-06-07 | 1944-12-26 | 0 | Details |
| US2362724A | Liquefied petroleum gas dispensing system | Expired / Lapsed | 1941-03-08 | 1944-11-14 | 0 | Details |
| US2356410A | Controlled cycle relief valve | Expired / Lapsed | 1942-01-03 | 1944-08-22 | 0 | Details |
| US2355857A | Hydrogen halide recovery | Expired / Lapsed | 1942-03-10 | 1944-08-15 | 0 | Details |
| US2356095A | Process for the purification of hydrocarbon liquids | Expired / Lapsed | 1942-01-27 | 1944-08-15 | 0 | Details |
| US2355366A | Process for catalytically desulphurizing hydrocarbon oil | Expired / Lapsed | 1942-01-12 | 1944-08-08 | 0 | Details |
| US2354283A | Antibuzz fluid pressure regulator | Expired / Lapsed | 1941-08-04 | 1944-07-25 | 0 | Details |
| US2353509A | Process for hydrocarbon conversion | Expired / Lapsed | 1942-02-06 | 1944-07-11 | 0 | Details |
| US2350584A | Furfural purification method | Expired / Lapsed | 1942-09-28 | 1944-06-06 | 0 | Details |
| US2347778A | Method of recovering hydrocarbons | Expired / Lapsed | 1941-11-10 | 1944-05-02 | 0 | Details |
| US2347794A | Well surveying device | Expired / Lapsed | 1941-03-15 | 1944-05-02 | 0 | Details |
| US2347726A | Wire line pressure retaining core barrel | Expired / Lapsed | 1939-08-29 | 1944-05-02 | 0 | Details |
| US2347317A | Treatment of mixtures of hydrocarbons and hydrofluoric acid | Expired / Lapsed | 1942-04-06 | 1944-04-25 | 0 | Details |
| US2340008A | Flowmeter for hydrofluoric acid | Expired / Lapsed | 1942-01-29 | 1944-01-25 | 0 | Details |
| US2336005A | Motor fuel production | Expired / Lapsed | 1940-03-11 | 1943-12-07 | 0 | Details |
| US2317901A | Conversion of hydrocarbons | Expired / Lapsed | 1940-03-11 | 1943-04-27 | 0 | Details |
| US2316361A | Method and apparatus for surveying wells | Expired / Lapsed | 1941-03-17 | 1943-04-13 | 0 | Details |
| US2314540A | Apparatus for measuring volume of bottom hole portion of we… | Expired / Lapsed | 1941-12-30 | 1943-03-23 | 0 | Details |
| US2314580A | Carburetor | Expired / Lapsed | 1941-09-16 | 1943-03-23 | 0 | Details |
| US2311154A | Process for agglomerating commercial carbon black | Expired / Lapsed | 1939-02-28 | 1943-02-16 | 0 | Details |
| US2303118A | Process for catalytic hydrogenation of liquid hydrocarbons | Expired / Lapsed | 1939-10-12 | 1942-11-24 | 0 | Details |
| US2300877A | Process for treating hydrocarbons | Expired / Lapsed | 1940-08-12 | 1942-11-03 | 0 | Details |
| US2297098A | Rectifying column control | Expired / Lapsed | 1940-03-23 | 1942-09-29 | 0 | Details |
| US2290408A | Exploration of boreholes | Expired / Lapsed | 1941-02-21 | 1942-07-21 | 0 | Details |
| US2281899A | Well equipment | Expired / Lapsed | 1939-03-30 | 1942-05-05 | 0 | Details |
| US2256775A | Pipe-line plug | Expired / Lapsed | 1940-04-18 | 1941-09-23 | 0 | Details |
| US2250912A | Well drilling system | Expired / Lapsed | 1939-10-09 | 1941-07-29 | 0 | Details |
| US2250703A | Apparatus for locating casing seats | Expired / Lapsed | 1938-11-18 | 1941-07-29 | 0 | Details |
| US2245485A | Pressure regulating device | Expired / Lapsed | 1938-04-12 | 1941-06-10 | 0 | Details |
| US2242627A | Hydrogenation catalyst and process | Expired / Lapsed | 1938-11-12 | 1941-05-20 | 0 | Details |
| US2178931A | Combination fluid conduit and electrical conductor | Expired / Lapsed | 1937-04-03 | 1939-11-07 | 0 | Details |
| US2176406A | Heat exchanger tube support | Expired / Lapsed | 1937-07-01 | 1939-10-17 | 0 | Details |
| US2159434A | Process for concentrating hydrocarbons | Expired / Lapsed | 1936-06-27 | 1939-05-23 | 0 | Details |
| US2139595A | Method for dissolving paraffing and wax | Expired / Lapsed | 1935-11-11 | 1938-12-06 | 0 | Details |
| US2110144A | Mechanical oscillator | Expired / Lapsed | 1935-07-24 | 1938-03-08 | 0 | Details |
| US2075171A | Process for desulphurizing hydrocarbons | Expired / Lapsed | 1935-05-21 | 1937-03-30 | 0 | Details |
| US2014314A | Adjustable orifice valve | Expired / Lapsed | 1931-07-22 | 1935-09-10 | 0 | Details |
| US1999808A | Valve | Expired / Lapsed | 1933-04-07 | 1935-04-30 | 0 | Details |
| US1905592A | Control device for wells | Expired / Lapsed | 1932-01-30 | 1933-04-25 | 0 | Details |
| US1831713A | Flow head with adjustable flow bean | Expired / Lapsed | 1931-04-20 | 1931-11-10 | 0 | Details |