Research Corp
Research CActive Patents
0
Total Holdings
184
Patent Holdings
Filter in Explorer →| Patent No. | Title | Status | Filing Date | Grant Date | Claims | Actions |
|---|---|---|---|---|---|---|
| EP0062391A1 | Delivery system for the sustained release of a substance in… | Expired / Lapsed | 1982-01-13 | — | 23 | Details |
| FR2361437A1 | THREE-DIMENSIONAL PERMEABLE MATERIAL OF EXTENDED SURFACE | Expired / Lapsed | 1977-08-10 | — | 0 | Details |
| DE2710674A1 | BLOOD STABILIZERS | Expired / Lapsed | 1977-03-11 | — | 0 | Details |
| DE2705202A1 | PHOTOCOAGULATING SCALPEL DEVICE | Expired / Lapsed | 1977-02-08 | — | 0 | Details |
| DE2416087A1 | POROESE BIOMATERIALS AND METHOD OF MANUFACTURING THE SAME | Expired / Lapsed | 1974-04-01 | — | 0 | Details |
| FR2223325A1 | FR2223325A1 - - Google Patents | Expired / Lapsed | 1974-03-29 | — | 0 | Details |
| US4749560A | Metal organo phosphorous compounds for NMR analysis | Expired / Lapsed | 1984-08-13 | 1988-06-07 | 13 | Details |
| US4508657A | Peptide synthesis and amino acid blocking agents | Expired / Lapsed | 1983-04-29 | 1985-04-02 | 15 | Details |
| US4239664A | Anti-thrombogenic PVP-heparin polymer | Expired / Lapsed | 1978-10-31 | 1980-12-16 | 2 | Details |
| US4234561A | Antigen for early pregnancy test and contraceptive vaccine | Expired / Lapsed | 1978-02-06 | 1980-11-18 | 10 | Details |
| US4231979A | High surface area permeable material | Expired / Lapsed | 1979-10-12 | 1980-11-04 | 16 | Details |
| US4175182A | Separation of high-activity heparin by affinity chromatogra… | Expired / Lapsed | 1978-07-03 | 1979-11-20 | 8 | Details |
| US4146603A | Tumor specific glycoproteins and method for detecting tumor… | Expired / Lapsed | 1977-02-18 | 1979-03-27 | 21 | Details |
| US4142533A | Monitoring system for cardiac pacers | Expired / Lapsed | 1976-10-28 | 1979-03-06 | 20 | Details |
| US4126136A | Photocoagulating scalpel system | Expired / Lapsed | 1976-02-09 | 1978-11-21 | 22 | Details |
| US4115209A | Method of determining ion activity using coated ion selecti… | Expired / Lapsed | 1977-10-20 | 1978-09-19 | 8 | Details |
| US4112951A | Surgical clip | Expired / Lapsed | 1976-01-26 | 1978-09-12 | 6 | Details |
| US4049802A | Zinc sulfadiazine and its use in the treatment of burns | Expired / Lapsed | 1975-03-19 | 1977-09-20 | 25 | Details |
| US4032625A | Bone-seeking technetium-99m complex | Expired / Lapsed | 1975-03-26 | 1977-06-28 | 4 | Details |
| US4017596A | Radiopharmaceutical chelates and method of external imaging | Expired / Lapsed | 1975-09-02 | 1977-04-12 | 16 | Details |
| US4016606A | Knee joint prosthesis | Expired / Lapsed | 1975-07-14 | 1977-04-12 | 9 | Details |
| US4016258A | Vasoactive intestinal peptide from fowl | Expired / Lapsed | 1975-08-05 | 1977-04-05 | 12 | Details |
| US4016149A | Selective removal of albumin from blood fluid and compositi… | Expired / Lapsed | 1975-08-04 | 1977-04-05 | 23 | Details |
| US4011601A | Prosthetic heart valve | Expired / Lapsed | 1975-10-14 | 1977-03-15 | 9 | Details |
| US3944997A | Image generator for a multiterminal graphic display system | Expired / Lapsed | 1974-05-22 | 1976-03-16 | 10 | Details |
| CA982941A | Blood compatible microencapsulated detoxicants | Expired / Lapsed | 1971-10-13 | 1976-02-03 | 0 | Details |
| US3925776A | Display terminal system | Expired / Lapsed | 1974-04-18 | 1975-12-09 | 41 | Details |
| US3921641A | Controlling forceps | Expired / Lapsed | 1973-12-14 | 1975-11-25 | 5 | Details |
| US3890107A | Materials useful for prosthetic devices and the like | Expired / Lapsed | 1972-09-25 | 1975-06-17 | 20 | Details |
| US3882854A | Surgical clip and applicator | Expired / Lapsed | 1973-08-23 | 1975-05-13 | 13 | Details |
| US3879371A | Isolation of vasoactive intestinal peptide | Expired / Lapsed | 1971-09-17 | 1975-04-22 | 8 | Details |
| US3843324A | Method of cell fractionation and apparatus therefor | Expired / Lapsed | 1972-09-13 | 1974-10-22 | 2 | Details |
| US3843446A | Preparation of enzymatically active membranes | Expired / Lapsed | 1971-04-20 | 1974-10-22 | 2 | Details |
| US3833404A | Vibration or sound damping coating for vibratory structures | Expired / Lapsed | 1972-05-31 | 1974-09-03 | 14 | Details |
| US3821643A | Blood coagulation timer | Expired / Lapsed | 1973-05-29 | 1974-06-28 | 5 | Details |
| US3792161A | Burn ointment comprising silver sulfadiazine and collagenase | Expired / Lapsed | 1970-11-24 | 1974-02-12 | 0 | Details |
| US3790507A | Plastic bone composition | Expired / Lapsed | 1970-07-06 | 1974-02-05 | 0 | Details |
| US3789029A | Plastic bone composition and method of making same | Expired / Lapsed | 1971-10-04 | 1974-01-29 | 0 | Details |
| US3786116A | Chemically joined,phase separated thermoplastic graft copol… | Expired / Lapsed | 1972-08-21 | 1974-01-15 | 0 | Details |
| US3769507A | Dynamic radiography | Expired / Lapsed | 1971-08-25 | 1973-10-30 | 31 | Details |
| US3768200A | Apparatus for the production of algae including a filtering… | Expired / Lapsed | 1971-07-16 | 1973-10-30 | 4 | Details |
| US3758396A | Ition preparation of immobilized enzymemembrane complexes b… | Expired / Lapsed | 1971-08-31 | 1973-09-11 | 0 | Details |
| US3725113A | Blood compatible microencapsulated detoxicants and method f… | Expired / Lapsed | 1970-12-17 | 1973-04-03 | 3 | Details |
| US3700895A | Scatterhole camera and method for using same including the … | Expired / Lapsed | 1969-08-14 | 1972-10-24 | 25 | Details |
| US3668560A | Pulse-width frequency modulation device | Expired / Lapsed | 1970-07-09 | 1972-06-06 | 7 | Details |
| US3645649A | Stirling cycle-type thermal device servo pump | Expired / Lapsed | 1970-03-04 | 1972-02-29 | 9 | Details |
| US3635004A | Orchard machine | Expired / Lapsed | 1970-03-02 | 1972-01-18 | 16 | Details |
| US3633584A | Method and means for marking animals for identification | Expired / Lapsed | 1969-06-10 | 1972-01-11 | 10 | Details |
| US3609867A | Plastic bone composition | Expired / Lapsed | 1969-03-10 | 1971-10-05 | 0 | Details |
| US3567028A | Membrane envelope assembly | Expired / Lapsed | 1968-12-26 | 1971-03-02 | 9 | Details |
| US3550070A | Fluid flowmeter | Expired / Lapsed | 1968-06-28 | 1970-12-22 | 0 | Details |
| US3543009A | Binary transversal filter systems | Expired / Lapsed | 1967-09-05 | 1970-11-24 | 0 | Details |
| US3532086A | Method and apparatus for determining blood loss of patients | Expired / Lapsed | 1966-02-23 | 1970-10-06 | 0 | Details |
| US3525026A | Apparatus responsive to the slip of an electrical machine | Expired / Lapsed | 1968-08-05 | 1970-08-18 | 0 | Details |
| US3477436A | Method of accelerating wound healing by use of interacting … | Expired / Lapsed | 1966-03-11 | 1969-11-11 | 0 | Details |
| US3467099A | Method and apparatus for the coagulation of small areas of … | Expired / Lapsed | 1967-03-30 | 1969-09-16 | 0 | Details |
| US3450992A | Product-type phase sensitive detector including a balanced … | Expired / Lapsed | 1966-04-27 | 1969-06-17 | 0 | Details |
| US3401688A | Skull tongs | Expired / Lapsed | 1966-05-20 | 1968-09-17 | 2 | Details |
| US3370710A | Compact blood dialyzer with a pleated membrane therein | Expired / Lapsed | 1966-05-11 | 1968-02-27 | 0 | Details |
| US3362540A | Disc-shaped, multiple cone type dialyzer having a tapered f… | Expired / Lapsed | 1966-08-24 | 1968-01-09 | 0 | Details |
| US3307392A | Automatic prothrombin timer apparatus and method | Expired / Lapsed | 1964-05-04 | 1967-03-07 | 2 | Details |
| US3285922A | N-cyclopropylmethyl-and -cyclobutyl-methyl-morphinans | Expired / Lapsed | 1963-10-25 | 1966-11-15 | 4 | Details |
| US3235036A | Brake control system | Expired / Lapsed | 1962-10-31 | 1966-02-15 | 2 | Details |
| US3105143A | Selective comparison apparatus for a digital computer | Expired / Lapsed | 1959-06-30 | 1963-09-24 | 2 | Details |
| US3056110A | Digital data transmission system | Expired / Lapsed | 1956-07-13 | 1962-09-25 | 0 | Details |
| US3045217A | Signal storage system | Expired / Lapsed | 1956-09-26 | 1962-07-17 | 0 | Details |
| US3039932A | Tissue culturing with arginine, citrulline or aspartic acid… | Expired / Lapsed | 1958-01-07 | 1962-06-19 | 2 | Details |
| US3037192A | Data processing system | Expired / Lapsed | 1957-12-27 | 1962-05-29 | 0 | Details |
| US3035481A | Cuvette oximeter | Expired / Lapsed | 1958-08-11 | 1962-05-22 | 0 | Details |
| US3029682A | Apparatus for determining percentage oxygen-saturation of b… | Expired / Lapsed | 1959-07-17 | 1962-04-17 | 1 | Details |
| US3018956A | Computing apparatus | Expired / Lapsed | 1957-12-03 | 1962-01-30 | 0 | Details |
| US3011711A | Cryogenic computing devices | Expired / Lapsed | 1957-04-03 | 1961-12-05 | 0 | Details |
| US3011164A | Digital expansion circuit | Expired / Lapsed | 1957-07-25 | 1961-11-28 | 0 | Details |
| US3010031A | Symmetrical back-clamped transistor switching sircuit | Expired / Lapsed | 1956-10-24 | 1961-11-21 | 0 | Details |
| US2988735A | Magnetic data storage | Expired / Lapsed | 1955-03-17 | 1961-06-13 | 0 | Details |
| US2982852A | Anti-multipath communication system | Expired / Lapsed | 1956-11-21 | 1961-05-02 | 0 | Details |
| US2982853A | Anti-multipath receiving system | Expired / Lapsed | 1956-07-02 | 1961-05-02 | 0 | Details |
| US2980866A | Function oscillator | Expired / Lapsed | 1958-01-07 | 1961-04-18 | 0 | Details |
| US2975342A | Narrow base planar junction punch-thru diode | Expired / Lapsed | 1957-08-16 | 1961-03-14 | 0 | Details |
| US2974561A | Polarimeter | Expired / Lapsed | 1956-12-20 | 1961-03-14 | 0 | Details |
| US2966302A | Digital analogue multiplier | Expired / Lapsed | 1956-08-09 | 1960-12-27 | 0 | Details |
| US2959722A | Demagnetizing circuit for electromagnetic apparatus | Expired / Lapsed | 1956-04-25 | 1960-11-08 | 0 | Details |
| US2953926A | Navigation system | Expired / Lapsed | 1957-01-18 | 1960-09-27 | 0 | Details |
| US2944542A | Detecting and recording physiological changes accompanying … | Expired / Lapsed | 1955-10-03 | 1960-07-12 | 0 | Details |
| US2932010A | Data storage system | Expired / Lapsed | 1956-05-03 | 1960-04-05 | 0 | Details |
| US2927582A | Pump-oxygenator | Expired / Lapsed | 1956-03-19 | 1960-03-08 | 0 | Details |
| US2916668A | Heat stabilized field emission electron sources | Expired / Lapsed | 1955-07-01 | 1959-12-08 | 0 | Details |
| US2909662A | Dielectric field emission methods and apparatus | Expired / Lapsed | 1955-07-18 | 1959-10-20 | 0 | Details |
| US2900353A | Combined electron and ion exchange compositions | Expired / Lapsed | 1954-11-15 | 1959-08-18 | 2 | Details |
| US2892968A | Voltage responsive screen control methods and systems | Expired / Lapsed | 1956-10-23 | 1959-06-30 | 0 | Details |
| US2853287A | Motion-measuring system | Expired / Lapsed | 1952-03-13 | 1958-09-23 | 0 | Details |
| US2847008A | Blood handling system for extracorporeal circulation devices | Expired / Lapsed | 1955-11-14 | 1958-08-12 | 0 | Details |
| US2832897A | Magnetically controlled gating element | Expired / Lapsed | 1955-07-27 | 1958-04-29 | 0 | Details |
| US2817771A | Pulse-height discriminator | Expired / Lapsed | 1953-04-06 | 1957-12-24 | 0 | Details |
| US2804578A | Phase-comparison distance relay | Expired / Lapsed | 1953-06-26 | 1957-08-27 | 0 | Details |
| US2802956A | Pendulum apparatus | Expired / Lapsed | 1951-04-25 | 1957-08-13 | 0 | Details |
| US2752792A | Gyroscopic apparatus | Expired / Lapsed | 1951-03-22 | 1956-07-03 | 0 | Details |
| US2752793A | Gyroscopic apparatus | Expired / Lapsed | 1951-03-22 | 1956-07-03 | 0 | Details |
| US2747612A | Force-compensated flow valve | Expired / Lapsed | 1951-04-24 | 1956-05-29 | 0 | Details |
| US2739304A | Indicating device | Expired / Lapsed | 1952-04-05 | 1956-03-20 | 0 | Details |
| US2736880A | Multicoordinate digital information storage device | Expired / Lapsed | 1951-05-11 | 1956-02-28 | 0 | Details |
| US2706927A | Apparatus for determining percentage oxygen-saturation of b… | Expired / Lapsed | 1949-08-04 | 1955-04-26 | 1 | Details |
| US2693535A | Apparatus for energizing electrical precipitators and the l… | Expired / Lapsed | 1948-06-18 | 1954-11-02 | 0 | Details |
| US2690178A | Automatic apparatus for administering drugs | Expired / Lapsed | 1950-11-13 | 1954-09-28 | 0 | Details |
| US2681121A | Recovery of suspended materials from gases | Expired / Lapsed | 1951-06-29 | 1954-06-15 | 0 | Details |
| US2674690A | Frequency modulation receiver | Expired / Lapsed | 1949-02-26 | 1954-04-06 | 0 | Details |
| US2667341A | Gaslock for spray nozzles | Expired / Lapsed | 1952-02-08 | 1954-01-26 | 0 | Details |
| US2656667A | Seed harvester having flexible stripping means | Expired / Lapsed | 1948-10-02 | 1953-10-27 | 0 | Details |
| US2647999A | Bistable circuits | Expired / Lapsed | 1952-05-01 | 1953-08-04 | 0 | Details |
| US2643819A | Apparatus for computing correlation functions | Expired / Lapsed | 1949-08-11 | 1953-06-30 | 0 | Details |
| US2628606A | Control system | Expired / Lapsed | 1950-06-24 | 1953-02-17 | 0 | Details |
| US2628186A | Carboxylic ion exchange resin purification of vitamin b12 | Expired / Lapsed | 1950-01-04 | 1953-02-10 | 1 | Details |
| US2627749A | Diaphragm type pressure indicator | Expired / Lapsed | 1949-10-08 | 1953-02-10 | 0 | Details |
| US2625136A | Electrohydraulic servo mechanism | Expired / Lapsed | 1950-04-26 | 1953-01-13 | 0 | Details |
| US2623549A | Radiant-energy-opaque fabric | Expired / Lapsed | 1949-04-21 | 1952-12-30 | 2 | Details |
| US2609606A | Gunsight having lead computing device | Expired / Lapsed | 1942-04-27 | 1952-09-09 | 0 | Details |
| US2598608A | Preparation of collagenous materials | Expired / Lapsed | 1946-06-11 | 1952-05-27 | 2 | Details |
| US2594122A | Photocell-filter combination | Expired / Lapsed | 1949-05-10 | 1952-04-22 | 0 | Details |
| US2576100A | Voltage stabilizing system and tube | Expired / Lapsed | 1945-07-13 | 1951-11-27 | 0 | Details |
| US2571937A | Interferometer with right-angle reflector surfaces at end o… | Expired / Lapsed | 1948-08-27 | 1951-10-16 | 0 | Details |
| US2557662A | Short-wave electromagnetic radiation catoptrics | Expired / Lapsed | 1948-11-29 | 1951-06-19 | 0 | Details |
| US2533908A | Radio signal detector | Expired / Lapsed | 1947-11-25 | 1950-12-12 | 0 | Details |
| US2523703A | System for transmitting signal modulated pulses | Expired / Lapsed | 1946-06-25 | 1950-09-26 | 0 | Details |
| US2523373A | Apparatus for air sterilization | Expired / Lapsed | 1946-05-10 | 1950-09-26 | 0 | Details |
| US2522153A | Image sensitive tube | Expired / Lapsed | 1945-07-26 | 1950-09-12 | 0 | Details |
| US2517260A | Apparatus for generating an accurately focused beam of char… | Expired / Lapsed | 1945-09-18 | 1950-08-01 | 0 | Details |
| US2501658A | Electromagnetic horn | Expired / Lapsed | 1942-10-12 | 1950-03-28 | 0 | Details |
| US2498882A | Impulse stimulating apparatus | Expired / Lapsed | 1946-06-20 | 1950-02-28 | 0 | Details |
| US2498186A | Purification of certain alkaline earth halides and crystal … | Expired / Lapsed | 1944-12-28 | 1950-02-21 | 1 | Details |
| US2488734A | Dynamo transformer | Expired / Lapsed | 1946-03-07 | 1949-11-22 | 0 | Details |
| US2484202A | Gas testing device | Expired / Lapsed | 1946-07-29 | 1949-10-11 | 0 | Details |
| US2480829A | Radio direction indicating apparatus | Expired / Lapsed | 1942-01-29 | 1949-09-06 | 0 | Details |
| US2470099A | Servo mechanism | Expired / Lapsed | 1944-10-31 | 1949-05-17 | 0 | Details |
| US2470716A | Electronic counting system | Expired / Lapsed | 1943-06-11 | 1949-05-17 | 0 | Details |
| US2445840A | Multisignal transmission | Expired / Lapsed | 1945-12-03 | 1948-07-27 | 0 | Details |
| US2444950A | Multisignal transmission system | Expired / Lapsed | 1945-10-30 | 1948-07-13 | 0 | Details |
| US2431890A | Method and receptacle for propagating plants | Expired / Lapsed | 1942-08-01 | 1947-12-02 | 0 | Details |
| US2427533A | Electronic switching device | Expired / Lapsed | 1943-12-31 | 1947-09-16 | 0 | Details |
| US2411299A | High-frequency triode oscillator | Expired / Lapsed | 1941-11-12 | 1946-11-19 | 0 | Details |
| US2409579A | Composite electrode | Expired / Lapsed | 1944-06-16 | 1946-10-15 | 0 | Details |
| US2404920A | Electronic discharge apparatus | Expired / Lapsed | 1940-09-27 | 1946-07-30 | 0 | Details |
| US2404918A | Counting system | Expired / Lapsed | 1940-05-01 | 1946-07-30 | 0 | Details |
| US2404919A | Electronic switching device and circuit therefor | Expired / Lapsed | 1940-05-01 | 1946-07-30 | 0 | Details |
| US2404542A | Resonator for oscillators | Expired / Lapsed | 1941-06-09 | 1946-07-23 | 0 | Details |
| US2401348A | Molding composition, molded product, and method of making | Expired / Lapsed | 1942-03-17 | 1946-06-04 | 0 | Details |
| US2400232A | Method of and instrument for guiding aircraft | Expired / Lapsed | 1938-12-10 | 1946-05-14 | 0 | Details |
| US2390074A | Protein product and process | Expired / Lapsed | 1942-02-09 | 1945-12-04 | 0 | Details |
| US2385803A | Process for the manufacture of plastic compositions | Expired / Lapsed | 1942-02-09 | 1945-10-02 | 0 | Details |
| US2385802A | Process for the manufacture of plastics | Expired / Lapsed | 1942-02-09 | 1945-10-02 | 0 | Details |
| US2379862A | Justifying typewriter | Expired / Lapsed | 1942-07-31 | 1945-07-10 | 0 | Details |
| US2377391A | Charging suspended particles | Expired / Lapsed | 1943-04-24 | 1945-06-05 | 0 | Details |
| US2372337A | Method of preparing starch derivatives | Expired / Lapsed | 1941-04-07 | 1945-03-27 | 0 | Details |
| US2363227A | Fermentation process for the production of riboflavin | Expired / Lapsed | 1943-04-13 | 1944-11-21 | 0 | Details |
| US2344536A | Space sterilization | Expired / Lapsed | 1943-04-05 | 1944-03-21 | 0 | Details |
| US2319219A | Pressure indicating apparatus | Expired / Lapsed | 1940-03-29 | 1943-05-18 | 0 | Details |
| US2307012A | Electromagnetic horn | Expired / Lapsed | 1938-11-15 | 1943-01-05 | 0 | Details |
| US2306555A | Method for frequency control | Expired / Lapsed | 1940-05-23 | 1942-12-29 | 0 | Details |
| US2306918A | Amine reaction product | Expired / Lapsed | 1940-02-15 | 1942-12-29 | 0 | Details |
| US2298405A | Cycloalkanyl peroxide and process of producing the same | Expired / Lapsed | 1939-09-07 | 1942-10-13 | 0 | Details |
| US2298272A | Electromagnetic horn | Expired / Lapsed | 1938-09-19 | 1942-10-13 | 0 | Details |
| US2281552A | Electric communication | Expired / Lapsed | 1938-10-31 | 1942-05-05 | 0 | Details |
| US2281551A | Electric communication | Expired / Lapsed | 1937-09-10 | 1942-05-05 | 0 | Details |
| US2281550A | Electric-circuit element | Expired / Lapsed | 1937-08-14 | 1942-05-05 | 0 | Details |
| US2281474A | Treating surfaces of light-transmitting articles, and the t… | Expired / Lapsed | 1939-03-20 | 1942-04-28 | 0 | Details |
| US2275675A | Detonation detector system | Expired / Lapsed | 1938-05-13 | 1942-03-10 | 0 | Details |
| US2273194A | Gas cleaning | Expired / Lapsed | 1941-03-11 | 1942-02-17 | 0 | Details |
| US2266638A | Flexible body | Expired / Lapsed | 1939-02-18 | 1941-12-16 | 0 | Details |
| US2256937A | Suspension of rotatable bodies | Expired / Lapsed | 1938-12-17 | 1941-09-23 | 0 | Details |
| US2255042A | Electromagnetic horn | Expired / Lapsed | 1939-01-03 | 1941-09-09 | 0 | Details |
| US2253501A | Resonant antenna system | Expired / Lapsed | 1937-09-10 | 1941-08-26 | 0 | Details |
| US2221338A | Deposition of material | Expired / Lapsed | 1936-10-21 | 1940-11-12 | 0 | Details |
| US2214976A | Apparatus for the manufacture of crystalline bodies | Expired / Lapsed | 1939-01-05 | 1940-09-17 | 0 | Details |
| US2213107A | Ultracentrifuge | Expired / Lapsed | 1938-11-28 | 1940-08-27 | 0 | Details |
| US2207656A | Process of decreasing reflection of light from surfaces, an… | Expired / Lapsed | 1938-12-27 | 1940-07-09 | 0 | Details |
| US2202900A | Indicating apparatus | Expired / Lapsed | 1934-01-02 | 1940-06-04 | 0 | Details |
| US2192249A | Apparatus and method for cleaning gases | Expired / Lapsed | 1938-07-06 | 1940-03-05 | 0 | Details |
| US2189122A | Method of and apparatus for sensing radiant energy | Expired / Lapsed | 1938-05-18 | 1940-02-06 | 0 | Details |
| US2182185A | High voltage ionic discharge device | Expired / Lapsed | 1938-06-24 | 1939-12-05 | 0 | Details |
| US2172304A | Gas treater | Expired / Lapsed | 1938-04-12 | 1939-09-05 | 0 | Details |
| US2097233A | Electrical deposition in pattern form | Expired / Lapsed | 1934-03-31 | 1937-10-26 | 0 | Details |
| US2009457A | Method and apparatus for producing high voltage | Expired / Lapsed | 1932-04-11 | 1935-07-30 | 0 | Details |
| US1948384A | Method and apparatus for the acceleration of ions | Expired / Lapsed | 1932-01-26 | 1934-02-20 | 0 | Details |
| US1444627A | System for scrubbing coal gas | Expired / Lapsed | 1918-12-17 | 1923-02-06 | 0 | Details |
| US1329859A | Apparatus for electrical treatment of gases | Expired / Lapsed | 1916-06-24 | 1920-02-03 | 0 | Details |