Shell Development Co
Shell DeveActive Patents
0
Total Holdings
237
Patent Holdings
Filter in Explorer →| Patent No. | Title | Status | Filing Date | Grant Date | Claims | Actions |
|---|---|---|---|---|---|---|
| GB600328A | Corrosion inhibition and anti-corrosion packaging | Expired / Lapsed | 1945-07-30 | — | 0 | Details |
| US4012457A | Thermal cracking method for the production of ethylene and … | Expired / Lapsed | 1975-10-06 | 1977-03-15 | 8 | Details |
| US2913356A | Preparation of paper having improved wet strength | Expired / Lapsed | 1955-06-28 | 1959-11-17 | 1 | Details |
| US2909494A | Process for resinifying polyepoxides and resulting products | Expired / Lapsed | 1955-11-22 | 1959-10-20 | 2 | Details |
| US2906720A | Composition comprising aromatic petroleum residue and polye… | Expired / Lapsed | 1957-04-24 | 1959-09-29 | 2 | Details |
| US2904535A | Curing polyalkyleneether polyurethanes with aromatic dhsocy… | Expired / Lapsed | 1956-02-27 | 1959-09-15 | 2 | Details |
| US2903381A | Treatment of synthetic textiles with a polyepoxide having a… | Expired / Lapsed | 1954-09-03 | 1959-09-08 | 2 | Details |
| US2870101A | Polyalkylene oxide resins | Expired / Lapsed | 1956-10-05 | 1959-01-20 | 2 | Details |
| US2867645A | Preparation of alkali metal salts of diesters of phosphoric… | Expired / Lapsed | 1955-01-17 | 1959-01-06 | 2 | Details |
| US2854215A | Offshore oil well installation | Expired / Lapsed | 1956-03-05 | 1958-09-30 | 2 | Details |
| US2852565A | Method for conducting free atom and free radical chain reac… | Expired / Lapsed | 1953-11-27 | 1958-09-16 | 2 | Details |
| US2849992A | Stratified charge internal combustion engine | Expired / Lapsed | 1955-12-15 | 1958-09-02 | 0 | Details |
| US2847475A | Copper-containing catalysts and process of producing aldehy… | Expired / Lapsed | 1955-06-06 | 1958-08-12 | 4 | Details |
| US2843560A | Cured silicon-containing products prepared from polyepoxides | Expired / Lapsed | 1954-04-30 | 1958-07-15 | 1 | Details |
| US2841624A | Process for producing alkylated phenols | Expired / Lapsed | 1957-05-08 | 1958-07-01 | 2 | Details |
| US2841244A | Process of lubricating engines with vaporous lubricants | Expired / Lapsed | 1954-10-18 | 1958-07-01 | 2 | Details |
| US2838644A | Electronic thermoregulator | Expired / Lapsed | 1956-01-20 | 1958-06-10 | 0 | Details |
| US2831350A | Metering separator | Expired / Lapsed | 1955-03-10 | 1958-04-22 | 2 | Details |
| US2831840A | Process for treating polymer coagulates | Expired / Lapsed | 1954-06-28 | 1958-04-22 | 2 | Details |
| US2830081A | Process for producing organic sulfonic acids | Expired / Lapsed | 1957-01-22 | 1958-04-08 | 2 | Details |
| US2829664A | Fluid flow control valve with remote pressure control | Expired / Lapsed | 1953-03-10 | 1958-04-08 | 0 | Details |
| US2821892A | Photographic printing apparatus for seismic and other recor… | Expired / Lapsed | 1952-09-30 | 1958-02-04 | 0 | Details |
| US2818372A | Evaporating hydrogen peroxide | Expired / Lapsed | 1955-09-06 | 1957-12-31 | 2 | Details |
| US2817646A | Process for preparing lactams and amides | Expired / Lapsed | 1955-12-06 | 1957-12-24 | 2 | Details |
| US2813127A | Diperoxides | Expired / Lapsed | 1956-04-19 | 1957-11-12 | 1 | Details |
| US2801229A | Curing glycidyl polyethers | Expired / Lapsed | 1953-07-29 | 1957-07-30 | 2 | Details |
| US2800366A | Tank spraying apparatus | Expired / Lapsed | 1955-12-20 | 1957-07-23 | 1 | Details |
| US2783250A | Unsaturated esters of epoxy-substituted polycarboxylic acid… | Expired / Lapsed | 1954-06-28 | 1957-02-26 | 0 | Details |
| US2783027A | Method and apparatus for submerged well drilling | Expired / Lapsed | 1954-04-20 | 1957-02-26 | 0 | Details |
| US2781970A | Analog computer | Expired / Lapsed | 1951-10-08 | 1957-02-19 | 0 | Details |
| US2776817A | Drilling apparatus | Expired / Lapsed | 1952-07-21 | 1957-01-08 | 0 | Details |
| US2773349A | Infra-red fuel flow controller | Expired / Lapsed | 1953-04-28 | 1956-12-11 | 0 | Details |
| US2765854A | Well completion tool | Expired / Lapsed | 1954-04-15 | 1956-10-09 | 0 | Details |
| US2764184A | Expandable tube plug | Expired / Lapsed | 1954-05-24 | 1956-09-25 | 0 | Details |
| US2755322A | Process for preparing unsaturated organic compounds | Expired / Lapsed | 1952-07-15 | 1956-07-17 | 2 | Details |
| US2752269A | Treatment of textile materials | Expired / Lapsed | 1951-12-01 | 1956-06-26 | 2 | Details |
| US2730532A | Epoxy-substituted esters of silicon acids and their prepara… | Expired / Lapsed | 1953-07-20 | 1956-01-10 | 6 | Details |
| US2727730A | Keyslot reamer | Expired / Lapsed | 1954-06-07 | 1955-12-20 | 0 | Details |
| US2718982A | Flow control system | Expired / Lapsed | 1951-09-21 | 1955-09-27 | 2 | Details |
| US2710070A | Seismic recording | Expired / Lapsed | 1951-03-26 | 1955-06-07 | 0 | Details |
| US2708485A | Well logging | Expired / Lapsed | 1952-04-29 | 1955-05-17 | 1 | Details |
| US2707440A | Oil well pump control system | Expired / Lapsed | 1951-07-21 | 1955-05-03 | 0 | Details |
| US2684949A | Method of producing dispersions of immiscible liquids or so… | Expired / Lapsed | 1952-04-12 | 1954-07-27 | 2 | Details |
| US2682515A | Adhesive composition containing polyepoxide materials | Expired / Lapsed | 1952-07-05 | 1954-06-29 | 2 | Details |
| US2682514A | Compositions containing glycidyl polyether of a polyhydric … | Expired / Lapsed | 1952-02-25 | 1954-06-29 | 2 | Details |
| US2681705A | Shutoff apparatus for dual production wells | Expired / Lapsed | 1951-06-05 | 1954-06-22 | 0 | Details |
| US2679757A | Apparatus for recording subsurface measurements | Expired / Lapsed | 1948-04-09 | 1954-06-01 | 0 | Details |
| US2676132A | 1,2,3,4,10,10-hexachloro-6,7-epoxy-1,4,4alpha,5,6,7,8,8alph… | Expired / Lapsed | 1950-04-18 | 1954-04-20 | 3 | Details |
| US2672392A | Ultrasonic flaw detecting and recording system | Expired / Lapsed | 1951-09-17 | 1954-03-16 | 0 | Details |
| US2668145A | Lubricating compositions | Expired / Lapsed | 1951-08-04 | 1954-02-02 | 2 | Details |
| CA499577A | Method for polymerization and products produced thereby | Expired / Lapsed | — | 1954-01-26 | 0 | Details |
| US2665885A | Apparatus for offshore coring | Expired / Lapsed | 1948-10-25 | 1954-01-12 | 0 | Details |
| US2664874A | Coated metal product and method of producing same | Expired / Lapsed | 1948-01-13 | 1954-01-05 | 1 | Details |
| US2661697A | Control system for oil well pumps | Expired / Lapsed | 1951-12-26 | 1953-12-08 | 0 | Details |
| US2654242A | Measurement of water vapor in gases | Expired / Lapsed | 1950-07-07 | 1953-10-06 | 0 | Details |
| US2651589A | Process for forming cured glycidyl ether resinous bonds bet… | Expired / Lapsed | 1949-10-25 | 1953-09-08 | 4 | Details |
| US2651027A | Well logging | Expired / Lapsed | 1949-10-01 | 1953-09-01 | 0 | Details |
| US2643243A | Curing glycidyl polyethers of dihydric phenols with sulfoni… | Expired / Lapsed | 1951-02-26 | 1953-06-23 | 2 | Details |
| US2640037A | Fatty acid salts of nitrogencontaining polyethers | Expired / Lapsed | 1951-10-03 | 1953-05-26 | 2 | Details |
| US2636861A | Hydraulic fluid | Expired / Lapsed | 1950-06-09 | 1953-04-28 | 2 | Details |
| US2631015A | Continuous helical liner for vessels | Expired / Lapsed | 1952-04-08 | 1953-03-10 | 0 | Details |
| US2629649A | Vapor-phase corrosion inhibitor | Expired / Lapsed | 1949-10-31 | 1953-02-24 | 0 | Details |
| US2624752A | Esters of tertiary alkyl-substituted aromatic acids | Expired / Lapsed | 1949-09-12 | 1953-01-06 | 1 | Details |
| US2616020A | Automatic temperature control | Expired / Lapsed | 1950-03-07 | 1952-10-28 | 0 | Details |
| US2604779A | Method and apparatus for measuring capillary pressure | Expired / Lapsed | 1948-05-11 | 1952-07-29 | 0 | Details |
| US2602785A | Compositions containing glycidyl polyethers of dihydric phe… | Expired / Lapsed | 1950-09-30 | 1952-07-08 | 2 | Details |
| US2599803A | Lubricating composition | Expired / Lapsed | 1948-11-01 | 1952-06-10 | 1 | Details |
| US2599817A | Carbo-polymerization homopolymers of unsaturated alcohol et… | Expired / Lapsed | 1948-01-12 | 1952-06-10 | 2 | Details |
| US2596737A | Styrenated products | Expired / Lapsed | 1950-10-13 | 1952-05-13 | 2 | Details |
| US2596327A | Electric heater | Expired / Lapsed | 1950-07-11 | 1952-05-13 | 0 | Details |
| US2588882A | Temperature compensator for capacitors | Expired / Lapsed | 1948-04-27 | 1952-03-11 | 0 | Details |
| US2579334A | Adjustable-rate differential pressure responsive device | Expired / Lapsed | 1949-07-30 | 1951-12-18 | 0 | Details |
| US2578653A | Method for stabilizing polydiene polymer reacted with sulfu… | Expired / Lapsed | 1949-04-26 | 1951-12-18 | 2 | Details |
| US2579215A | Wide range liquid fuel burner and method for increasing adj… | Expired / Lapsed | 1948-10-04 | 1951-12-18 | 0 | Details |
| US2577612A | Dielectric constant measurement | Expired / Lapsed | 1948-08-28 | 1951-12-04 | 0 | Details |
| US2575558A | Glycidyl ether compositions and method of using same | Expired / Lapsed | 1948-07-26 | 1951-11-20 | 3 | Details |
| US2565529A | Conjugated aldehyde-secondary amine reaction products | Expired / Lapsed | 1946-10-18 | 1951-08-28 | 2 | Details |
| US2564194A | Stabilization of high molecular weight organic material con… | Expired / Lapsed | 1951-03-02 | 1951-08-14 | 2 | Details |
| US2564422A | Corrosion preventive composition | Expired / Lapsed | 1947-04-28 | 1951-08-14 | 2 | Details |
| US2563772A | High molecular weight halogen-containing organic materials … | Expired / Lapsed | 1949-03-22 | 1951-08-07 | 2 | Details |
| US2563383A | Terminally unsaturated polythio polyethers | Expired / Lapsed | 1949-01-29 | 1951-08-07 | 2 | Details |
| US2563771A | Carbonates of unsaturated diols | Expired / Lapsed | 1946-12-23 | 1951-08-07 | 1 | Details |
| US2559245A | System for amplifying small direct currents | Expired / Lapsed | 1949-06-14 | 1951-07-03 | 0 | Details |
| US2553718A | Glycidyl ether compositions | Expired / Lapsed | 1949-07-05 | 1951-05-22 | 2 | Details |
| US2554222A | Lubricants | Expired / Lapsed | 1947-10-28 | 1951-05-22 | 2 | Details |
| US2550093A | Oil well control system | Expired / Lapsed | 1949-03-15 | 1951-04-24 | 0 | Details |
| US2550052A | Viscosity meter | Expired / Lapsed | 1949-02-21 | 1951-04-24 | 2 | Details |
| US2548159A | Group viii silicate catalyst on nonsiliceous support | Expired / Lapsed | 1948-01-13 | 1951-04-10 | 2 | Details |
| US2548485A | Combustion chamber lining | Expired / Lapsed | 1947-01-08 | 1951-04-10 | 0 | Details |
| US2547703A | Seismic exploration system | Expired / Lapsed | 1948-07-10 | 1951-04-03 | 0 | Details |
| US2545832A | Method for manufacturing laminated articles | Expired / Lapsed | 1945-08-27 | 1951-03-20 | 2 | Details |
| US2540589A | Magnetic testing recording system for metallic bodies | Expired / Lapsed | 1950-07-03 | 1951-02-06 | 0 | Details |
| US2540588A | Magnetic testing device | Expired / Lapsed | 1947-10-13 | 1951-02-06 | 0 | Details |
| US2538297A | Heat and light stable vinyl resin compositions | Expired / Lapsed | 1947-07-14 | 1951-01-16 | 2 | Details |
| US2536685A | Synthetic lubricant | Expired / Lapsed | 1947-06-02 | 1951-01-02 | 2 | Details |
| US2528934A | Adhesive composition containing a fluidized glycidyl ether … | Expired / Lapsed | 1949-04-29 | 1950-11-07 | 2 | Details |
| US2528933A | Adhesive composition containing glycidyl ethers and alumina | Expired / Lapsed | 1949-04-29 | 1950-11-07 | 2 | Details |
| US2528417A | Epoxy ether compositions containing phenolic pitch | Expired / Lapsed | 1949-01-25 | 1950-10-31 | 2 | Details |
| US2522155A | Lubricating compositions | Expired / Lapsed | 1946-10-18 | 1950-09-12 | 2 | Details |
| US2520733A | Polymers of trimethylene glycol | Expired / Lapsed | 1946-08-26 | 1950-08-29 | 2 | Details |
| US2511498A | Rubber impregnated fabrics | Expired / Lapsed | 1947-07-14 | 1950-06-13 | 2 | Details |
| US2509621A | Dynamic pressure measurement | Expired / Lapsed | 1948-10-26 | 1950-05-30 | 0 | Details |
| US2509620A | Nonflammable hydraulic fluid | Expired / Lapsed | 1947-05-13 | 1950-05-30 | 2 | Details |
| US2501966A | Halogenation of peroxides | Expired / Lapsed | 1946-06-24 | 1950-03-28 | 2 | Details |
| US2500600A | Compositions of matter containing epoxy ethers and diamines | Expired / Lapsed | 1948-02-28 | 1950-03-14 | 2 | Details |
| US2496222A | Continuous process for emulsion polymerization of unsaturat… | Expired / Lapsed | 1947-06-17 | 1950-01-31 | 2 | Details |
| US2493498A | Heating method and apparatus | Expired / Lapsed | 1946-10-25 | 1950-01-03 | 0 | Details |
| US2492955A | Polyoxyalkylene compounds | Expired / Lapsed | 1946-08-31 | 1950-01-03 | 2 | Details |
| US2491445A | Flowmeter | Expired / Lapsed | 1947-02-24 | 1949-12-13 | 0 | Details |
| US2481278A | Polyoxyalkylene compounds | Expired / Lapsed | 1946-08-31 | 1949-09-06 | 0 | Details |
| US2479821A | Process and apparatus for refrigeration | Expired / Lapsed | 1946-03-30 | 1949-08-23 | 0 | Details |
| US2479866A | Liquid air refrigerator | Expired / Lapsed | 1945-12-07 | 1949-08-23 | 0 | Details |
| US2478675A | Removal of alkali from alumina | Expired / Lapsed | 1948-02-10 | 1949-08-09 | 0 | Details |
| US2476922A | Glycidyl allyl phthalate and related mixed esters together … | Expired / Lapsed | 1946-06-15 | 1949-07-19 | 0 | Details |
| US2476810A | Method and apparatus for radiological measurements | Expired / Lapsed | 1945-04-10 | 1949-07-19 | 0 | Details |
| US2475016A | Emulsion polymerization of vinylidene compounds | Expired / Lapsed | 1946-04-25 | 1949-07-05 | 0 | Details |
| US2472503A | Lubricating oil compositions | Expired / Lapsed | 1946-11-09 | 1949-06-07 | 0 | Details |
| US2465628A | Instrumentation assembly | Expired / Lapsed | 1944-05-10 | 1949-03-29 | 0 | Details |
| US2464753A | Allyl glycidyl mixed diether of bis-(4-hydroxyphenyl)-2,2-p… | Expired / Lapsed | 1947-03-25 | 1949-03-15 | 0 | Details |
| US2461339A | Unsaturated thioethers of cyclic sulfones | Expired / Lapsed | 1946-01-07 | 1949-02-08 | 0 | Details |
| US2460303A | Gasoline manufacture | Expired / Lapsed | 1942-01-29 | 1949-02-01 | 0 | Details |
| US2456401A | Interference eliminator for seismic recording systems | Expired / Lapsed | 1945-09-24 | 1948-12-14 | 0 | Details |
| US2455569A | Reaction products of tertiary organic hydroperoxides with a… | Expired / Lapsed | 1948-07-20 | 1948-12-07 | 0 | Details |
| US2454724A | Molybdena catalysts, their preparation and use | Expired / Lapsed | 1943-02-15 | 1948-11-23 | 0 | Details |
| US2452920A | Method and apparatus for drilling and producing wells | Expired / Lapsed | 1945-07-02 | 1948-11-02 | 0 | Details |
| US2450234A | Autocondensation polymers of unsaturated glycidyl ethers an… | Expired / Lapsed | 1943-12-07 | 1948-09-28 | 0 | Details |
| US2437985A | Production of thioketones | Expired / Lapsed | 1944-06-16 | 1948-03-16 | 0 | Details |
| US2436039A | Magnetic field gradient measurement | Expired / Lapsed | 1945-01-11 | 1948-02-17 | 0 | Details |
| US2435379A | Preparation of spheroidal catalyst | Expired / Lapsed | 1943-12-14 | 1948-02-03 | 0 | Details |
| US2435071A | Amides of cyclic sulfones | Expired / Lapsed | 1943-07-19 | 1948-01-27 | 0 | Details |
| US2432039A | Device for measuring the density of fluids in pipes | Expired / Lapsed | 1946-02-25 | 1947-12-02 | 0 | Details |
| US2430015A | Utilization of powdered catalysts | Expired / Lapsed | 1945-08-21 | 1947-11-04 | 0 | Details |
| US2428326A | Go-devil device for locating obstructions in pipe lines | Expired / Lapsed | 1943-11-27 | 1947-09-30 | 0 | Details |
| US2427640A | Polymerizable esters and polymers thereof | Expired / Lapsed | 1944-02-01 | 1947-09-16 | 0 | Details |
| US2427488A | Asphalt compositions having improved adhesivity to aggregate | Expired / Lapsed | 1942-09-21 | 1947-09-16 | 0 | Details |
| US2426476A | Di (tertiary alkyl) peroxide polymerization catalysts | Expired / Lapsed | 1943-03-29 | 1947-08-26 | 0 | Details |
| US2425193A | Well control system | Expired / Lapsed | 1944-12-26 | 1947-08-05 | 0 | Details |
| US2422372A | Preparation of an alumina supported molybdenum oxide cataly… | Expired / Lapsed | 1942-07-27 | 1947-06-17 | 0 | Details |
| US2417609A | Electronic commutator | Expired / Lapsed | 1943-07-28 | 1947-03-18 | 0 | Details |
| US2413312A | Catalytic finishing of gasolines | Expired / Lapsed | 1945-01-26 | 1946-12-31 | 0 | Details |
| US2406671A | Cutting oil | Expired / Lapsed | 1944-09-25 | 1946-08-27 | 0 | Details |
| US2404871A | Lubricating compositions | Expired / Lapsed | 1943-07-28 | 1946-07-30 | 0 | Details |
| US2403758A | Asymmetrical ditertiary peroxides | Expired / Lapsed | 1943-10-04 | 1946-07-09 | 0 | Details |
| US2402825A | Method of preparing and purifying dicarboxylic acids | Expired / Lapsed | 1943-06-23 | 1946-06-25 | 0 | Details |
| US2400333A | Polyvinyl acetal composition | Expired / Lapsed | 1943-04-09 | 1946-05-14 | 0 | Details |
| US2399240A | Alkylation of isoparaffins with olefins | Expired / Lapsed | 1942-01-29 | 1946-04-30 | 0 | Details |
| US2398202A | Anticorrosive | Expired / Lapsed | 1943-02-08 | 1946-04-09 | 0 | Details |
| US2393925A | Insecticides | Expired / Lapsed | 1943-01-26 | 1946-01-29 | 0 | Details |
| US2392579A | Process for the treatment of olefinic sulphur-bearing gasol… | Expired / Lapsed | 1945-02-10 | 1946-01-08 | 0 | Details |
| US2385522A | Lubricating system | Expired / Lapsed | 1942-05-16 | 1945-09-25 | 0 | Details |
| US2380520A | Borehole indicating apparatus | Expired / Lapsed | 1944-03-25 | 1945-07-31 | 0 | Details |
| US2380185A | Production of hydroxy ethers | Expired / Lapsed | 1942-11-06 | 1945-07-10 | 0 | Details |
| US2379697A | Production of diolefins | Expired / Lapsed | 1943-02-16 | 1945-07-03 | 0 | Details |
| US2379138A | Annular flow measuring device | Expired / Lapsed | 1943-01-11 | 1945-06-26 | 0 | Details |
| US2378235A | Process for ground fixation | Expired / Lapsed | 1942-09-15 | 1945-06-12 | 0 | Details |
| US2375687A | Process for producing beta-olefins | Expired / Lapsed | 1941-08-29 | 1945-05-08 | 0 | Details |
| US2375007A | Antifoaming composition | Expired / Lapsed | 1943-04-15 | 1945-05-01 | 0 | Details |
| US2374485A | Process for the removal of organic radicals from n-substitu… | Expired / Lapsed | 1944-04-10 | 1945-04-24 | 0 | Details |
| US2373951A | Foam prevention in vapor phase extraction processes | Expired / Lapsed | 1942-01-31 | 1945-04-17 | 0 | Details |
| US2363987A | Apparatus for electrical exploration | Expired / Lapsed | 1941-09-08 | 1944-11-28 | 0 | Details |
| US2358619A | Method for reconditioning used solutizer solutions | Expired / Lapsed | 1942-12-07 | 1944-09-19 | 0 | Details |
| US2357145A | Full hole cementing device | Expired / Lapsed | 1943-01-15 | 1944-08-29 | 0 | Details |
| US2353920A | Vibration detector | Expired / Lapsed | 1942-05-30 | 1944-07-18 | 0 | Details |
| US2353484A | Seismic exploration method | Expired / Lapsed | 1942-01-05 | 1944-07-11 | 0 | Details |
| US2352825A | Seismograph amplification gain control | Expired / Lapsed | 1942-08-18 | 1944-07-04 | 0 | Details |
| US2352833A | Choke valve borehole indicating system | Expired / Lapsed | 1942-04-24 | 1944-07-04 | 0 | Details |
| US2352993A | Radiological method of logging wells | Expired / Lapsed | 1940-04-20 | 1944-07-04 | 0 | Details |
| US2352435A | Organic sulphur compound and a process for its preparation | Expired / Lapsed | 1940-05-25 | 1944-06-27 | 0 | Details |
| US2351384A | Lithium soap grease | Expired / Lapsed | 1942-11-18 | 1944-06-13 | 0 | Details |
| US2351322A | Bottom hole regulator | Expired / Lapsed | 1942-01-13 | 1944-06-13 | 0 | Details |
| US2349186A | Sensitivity control for seismic recording | Expired / Lapsed | 1942-08-31 | 1944-05-16 | 0 | Details |
| US2346060A | Method and apparatus for setting well casing | Expired / Lapsed | 1941-03-18 | 1944-04-04 | 0 | Details |
| US2345487A | Method for effecting catalytic conversions | Expired / Lapsed | 1942-03-09 | 1944-03-28 | 0 | Details |
| US2339129A | Radiological method of surveying wells | Expired / Lapsed | 1942-01-20 | 1944-01-11 | 0 | Details |
| US2334341A | Process for recovery of tar oils | Expired / Lapsed | 1942-09-22 | 1943-11-16 | 0 | Details |
| US2330755A | Pipe-line control system | Expired / Lapsed | 1942-08-29 | 1943-09-28 | 0 | Details |
| US2326736A | Polymerizing unsaturated resinophoric compounds by action o… | Expired / Lapsed | 1940-09-21 | 1943-08-17 | 0 | Details |
| US2327053A | Production of hydroxy ethers | Expired / Lapsed | 1939-11-18 | 1943-08-17 | 0 | Details |
| US2326442A | Gas-lift control | Expired / Lapsed | 1941-08-05 | 1943-08-10 | 0 | Details |
| US2325199A | Method and apparatus for seismic exploration | Expired / Lapsed | 1941-06-30 | 1943-07-27 | 0 | Details |
| US2325264A | Hydraulic drilling device | Expired / Lapsed | 1940-09-27 | 1943-07-27 | 0 | Details |
| US2319514A | Apparatus for controlling fluid flow through drill strings | Expired / Lapsed | 1941-09-08 | 1943-05-18 | 0 | Details |
| US2311713A | Catalyst and process for the preparation thereof | Expired / Lapsed | 1940-04-20 | 1943-02-23 | 0 | Details |
| US2310575A | Ignition system for internal combustion engines | Expired / Lapsed | 1940-05-17 | 1943-02-09 | 0 | Details |
| US2297660A | Nonaqueous drilling fluid | Expired / Lapsed | 1940-07-27 | 1942-09-29 | 0 | Details |
| US2297666A | Internal corrosion prevention in conduits | Expired / Lapsed | 1940-03-09 | 1942-09-29 | 0 | Details |
| US2288982A | Production of extrusion products from diene hydrocarbons | Expired / Lapsed | 1939-04-03 | 1942-07-07 | 0 | Details |
| US2282712A | Recovery of hydrogen halides | Expired / Lapsed | 1940-04-30 | 1942-05-12 | 0 | Details |
| US2279688A | Corrosion preventive | Expired / Lapsed | 1940-12-24 | 1942-04-14 | 0 | Details |
| US2278965A | Metal derivatives of amino methylene aldehydes | Expired / Lapsed | 1939-09-05 | 1942-04-07 | 0 | Details |
| US2278064A | Sulphonates | Expired / Lapsed | 1940-08-04 | 1942-03-31 | 0 | Details |
| US2277512A | Catalyst | Expired / Lapsed | 1939-08-28 | 1942-03-24 | 0 | Details |
| US2268137A | Electrical well-logging system | Expired / Lapsed | 1939-12-11 | 1941-12-30 | 0 | Details |
| US2265762A | Separation of phases with the aid of sonic waves | Expired / Lapsed | 1940-04-09 | 1941-12-09 | 0 | Details |
| US2265722A | Process for treatment of high molecular weight multiunsatur… | Expired / Lapsed | 1939-12-23 | 1941-12-09 | 0 | Details |
| US2265870A | Isomerization of hydrocarbons | Expired / Lapsed | 1939-07-31 | 1941-12-09 | 0 | Details |
| US2265962A | Method of treating oil and gas wells | Expired / Lapsed | 1936-09-09 | 1941-12-09 | 0 | Details |
| US2262490A | Casing head structure | Expired / Lapsed | 1940-11-12 | 1941-11-11 | 0 | Details |
| US2262364A | Cable feeding mechanism | Expired / Lapsed | 1940-02-15 | 1941-11-11 | 0 | Details |
| US2258111A | Preparation of catalysts | Expired / Lapsed | 1939-10-09 | 1941-10-07 | 0 | Details |
| US2245575A | Hydraulic disruption of solids | Expired / Lapsed | 1939-08-14 | 1941-06-17 | 0 | Details |
| US2245310A | Process for undulating artificial fibers | Expired / Lapsed | 1939-04-03 | 1941-06-10 | 0 | Details |
| US2235631A | Variable stroke pump | Expired / Lapsed | 1939-09-13 | 1941-03-18 | 0 | Details |
| US2232674A | Method for carrying out chemical reactions | Expired / Lapsed | 1939-05-27 | 1941-02-18 | 0 | Details |
| US2224849A | Process and products relating to glycidols | Expired / Lapsed | 1937-11-06 | 1940-12-17 | 0 | Details |
| US2220509A | Process and apparatus for exploring georlogical strata | Expired / Lapsed | 1940-01-30 | 1940-11-05 | 0 | Details |
| US2220558A | Detonation suppression system for internal combustion engin… | Expired / Lapsed | 1939-05-09 | 1940-11-05 | 0 | Details |
| US2217879A | Method and apparatus for drilling into water covered ground | Expired / Lapsed | 1940-01-16 | 1940-10-15 | 0 | Details |
| US2217876A | Valve for controlling and interrupting the flow of fluids | Expired / Lapsed | 1939-03-24 | 1940-10-15 | 0 | Details |
| US2203217A | Process for recovering alkyl phenols from petroleum oils | Expired / Lapsed | 1937-05-25 | 1940-06-04 | 0 | Details |
| US2197453A | Method of underground exploration | Expired / Lapsed | 1938-01-03 | 1940-04-16 | 0 | Details |
| US2187393A | Production of carbon disulphide | Expired / Lapsed | 1938-02-01 | 1940-01-16 | 0 | Details |
| US2184235A | Catalytic dehydrogenation of organic compounds | Expired / Lapsed | 1937-12-06 | 1939-12-19 | 0 | Details |
| US2172822A | Isobutenyl amines and process of making them | Expired / Lapsed | 1937-02-01 | 1939-09-12 | 0 | Details |
| US2169685A | Electrical method of geophysical exploration | Expired / Lapsed | 1937-06-08 | 1939-08-15 | 0 | Details |
| US2152162A | Purification of aqueous solutions of aliphatic esters of po… | Expired / Lapsed | 1936-12-12 | 1939-03-28 | 0 | Details |
| US2142980A | High molecular weight polar compounds and process of making… | Expired / Lapsed | 1937-02-27 | 1939-01-03 | 0 | Details |
| US2140183A | Method of treating wells | Expired / Lapsed | 1936-07-03 | 1938-12-13 | 0 | Details |
| US2139392A | Extraction process | Expired / Lapsed | 1935-05-27 | 1938-12-06 | 0 | Details |
| US2130084A | Halo-substitution of unsaturated organic compounds | Expired / Lapsed | 1938-02-10 | 1938-09-13 | 0 | Details |
| US2128574A | Process for lubricant composition | Expired / Lapsed | 1936-10-19 | 1938-08-30 | 0 | Details |
| US2124530A | Method of treating wells | Expired / Lapsed | 1936-06-20 | 1938-07-26 | 0 | Details |
| US2123482A | Process of preparing mixtures of rubber | Expired / Lapsed | 1937-09-29 | 1938-07-12 | 0 | Details |
| US2122826A | Treatment of unsaturated compounds | Expired / Lapsed | 1936-01-28 | 1938-07-05 | 0 | Details |
| US2118454A | Process for separating high molecular mixtures of the ester… | Expired / Lapsed | 1936-03-24 | 1938-05-24 | 0 | Details |
| US2111360A | Extraction process | Expired / Lapsed | 1935-05-21 | 1938-03-15 | 0 | Details |
| US2101408A | Seismic surveying method | Expired / Lapsed | 1935-11-06 | 1937-12-07 | 0 | Details |
| US2092295A | Production of synthetic resins and resinous materials | Expired / Lapsed | 1935-12-18 | 1937-09-07 | 0 | Details |
| US2081322A | Process and apparatus for conducting chemical reactions | Expired / Lapsed | 1930-10-08 | 1937-05-25 | 0 | Details |
| US2070990A | Treatment of halogenated polyhydric alcohols | Expired / Lapsed | 1934-06-25 | 1937-02-16 | 0 | Details |
| US2061377A | Conversion of polyhalogenated alcohols | Expired / Lapsed | 1934-06-25 | 1936-11-17 | 0 | Details |
| US2052268A | Production of valuable products from unsaturated compounds … | Expired / Lapsed | 1935-03-18 | 1936-08-25 | 0 | Details |
| US2051806A | Production of mercaptans | Expired / Lapsed | 1935-03-18 | 1936-08-25 | 0 | Details |
| US2043941A | Repellent and/or fumigant | Expired / Lapsed | 1933-11-18 | 1936-06-09 | 0 | Details |
| US2030244A | Caliper | Expired / Lapsed | 1929-09-28 | 1936-02-11 | 0 | Details |
| US2007159A | Segregation of tertiary base olefines | Expired / Lapsed | 1931-06-01 | 1935-07-09 | 0 | Details |
| US1988673A | Apparatus for burning liquid fuel | Expired / Lapsed | 1933-01-13 | 1935-01-22 | 0 | Details |