National Research Development Corp UK
National RActive Patents
0
Total Holdings
211
Patent Holdings
Filter in Explorer →| Patent No. | Title | Status | Filing Date | Grant Date | Claims | Actions |
|---|---|---|---|---|---|---|
| WO1988000683A1 | Microscopes | Expired / Lapsed | 1987-07-17 | — | 0 | Details |
| EP0108497A1 | Irradiative probe system | Expired / Lapsed | 1983-10-04 | — | 5 | Details |
| EP0094829A2 | Endoprosthetic bone joint devices | Expired / Lapsed | 1983-05-17 | — | 17 | Details |
| EP0091315A1 | Endoprosthetic bone joint devices | Expired / Lapsed | 1983-04-06 | — | 15 | Details |
| EP0055032A2 | Field effect transistors | Expired / Lapsed | 1981-11-25 | — | 13 | Details |
| WO1981002789A1 | Methods of producing image information from objects | Expired / Lapsed | 1981-03-13 | — | 0 | Details |
| DE2451513A1 | BLOOD GAS MONITORING DEVICE | Expired / Lapsed | 1974-10-30 | — | 0 | Details |
| DE2126705A1 | Instrument for making an opening in a tissue wall, for exam… | Expired / Lapsed | 1971-05-28 | — | 0 | Details |
| US4547391A | Arc deposition of metal onto a substrate | Expired / Lapsed | 1984-05-21 | 1985-10-15 | 13 | Details |
| US4437635A | Pantograph linkage system | Expired / Lapsed | 1982-01-25 | 1984-03-20 | 7 | Details |
| US4405249A | Dispensing apparatus and method | Expired / Lapsed | 1981-03-19 | 1983-09-20 | 9 | Details |
| US4380477A | Cleaning pipes using mixtures of liquid and abrasive partic… | Expired / Lapsed | 1980-11-06 | 1983-04-19 | 15 | Details |
| US4375703A | Endoprosthetic bone joint devices | Expired / Lapsed | 1980-08-12 | 1983-03-08 | 15 | Details |
| US4365864A | Optical fibre multiport couplers | Expired / Lapsed | 1980-08-01 | 1982-12-28 | 15 | Details |
| US4360012A | External fixation devices for orthopaedic fractures | Expired / Lapsed | 1981-02-18 | 1982-11-23 | 4 | Details |
| US4329328A | Method of synthesizing zincosilicate or stannosilicate or t… | Expired / Lapsed | 1980-10-16 | 1982-05-11 | 15 | Details |
| US4319186A | Signal sensors | Expired / Lapsed | 1979-04-30 | 1982-03-09 | 8 | Details |
| US4316458A | Patient ventilators | Expired / Lapsed | 1979-05-08 | 1982-02-23 | 8 | Details |
| US4308873A | Electroencephalograph monitoring | Expired / Lapsed | 1979-03-09 | 1982-01-05 | 14 | Details |
| US4284351A | Processing of digital signals | Expired / Lapsed | 1980-05-21 | 1981-08-18 | 6 | Details |
| US4204283A | Prosthetic valve | Expired / Lapsed | 1978-05-03 | 1980-05-27 | 15 | Details |
| US4200701A | Polymeric materials | Expired / Lapsed | 1977-08-29 | 1980-04-29 | 25 | Details |
| US4191187A | Medical apparatus | Expired / Lapsed | 1978-03-08 | 1980-03-04 | 11 | Details |
| US4191735A | Growth of synthetic diamonds | Expired / Lapsed | 1978-02-17 | 1980-03-04 | 23 | Details |
| US4166695A | Method and apparatus for measuring retinal blood flow | Expired / Lapsed | 1977-03-29 | 1979-09-04 | 9 | Details |
| DE2265121C3 | Enzyme preparation for the determination of cholesterol and… | Expired / Lapsed | 1972-09-22 | 1979-07-26 | 0 | Details |
| US4149420A | Ultrasonic phased array systems | Expired / Lapsed | 1977-11-04 | 1979-04-17 | 5 | Details |
| US4141345A | Cervical dilation measurement instruments | Expired / Lapsed | 1977-01-05 | 1979-02-27 | 15 | Details |
| US4133724A | Anodizing a compound semiconductor | Expired / Lapsed | 1977-11-30 | 1979-01-09 | 15 | Details |
| US4128884A | Methods and apparatus for analyzing frequency distributions | Expired / Lapsed | 1976-02-20 | 1978-12-05 | 24 | Details |
| US4124301A | Device for measuring light transmitted through a material | Expired / Lapsed | 1976-11-02 | 1978-11-07 | 6 | Details |
| US4119946A | Comparison apparatus, e.g. for use in character recognition | Expired / Lapsed | 1977-05-20 | 1978-10-10 | 17 | Details |
| US4114188A | Apparatus for indicating uterine activity in labor | Expired / Lapsed | 1977-01-05 | 1978-09-12 | 25 | Details |
| US4107780A | Display apparatus | Expired / Lapsed | 1977-01-25 | 1978-08-15 | 14 | Details |
| US4102338A | Hardenable sheet materials | Expired / Lapsed | 1976-10-20 | 1978-07-25 | 40 | Details |
| US4085466A | Prosthetic joint device | Expired / Lapsed | 1977-08-04 | 1978-04-25 | 15 | Details |
| US4079801A | Vehicle guidance systems | Expired / Lapsed | 1976-08-03 | 1978-03-21 | 12 | Details |
| US4068951A | Distance measuring apparatus | Expired / Lapsed | 1976-04-27 | 1978-01-17 | 11 | Details |
| US4060856A | Surgical use of a laryngeal prosthesis | Expired / Lapsed | 1977-01-28 | 1977-12-06 | 3 | Details |
| US4060401A | Method for making aligned fibrous crystals | Expired / Lapsed | 1976-04-01 | 1977-11-29 | 12 | Details |
| US4059102A | Bone securing devices | Expired / Lapsed | 1976-09-30 | 1977-11-22 | 3 | Details |
| US4057049A | Apparatus for and methods of pulse-echo examination | Expired / Lapsed | 1975-10-07 | 1977-11-08 | 9 | Details |
| US4053585A | Immunological preparations | Expired / Lapsed | 1975-06-25 | 1977-10-11 | 20 | Details |
| US4044402A | Laryngeal prosthesis | Expired / Lapsed | 1975-02-28 | 1977-08-30 | 10 | Details |
| US4026286A | Isolators | Expired / Lapsed | 1976-05-25 | 1977-05-31 | 16 | Details |
| US4024531A | Display devices | Expired / Lapsed | 1975-03-03 | 1977-05-17 | 3 | Details |
| US4021726A | Image formation using nuclear magnetic resonance | Expired / Lapsed | 1975-09-04 | 1977-05-03 | 11 | Details |
| US4015196A | Analysis of materials | Expired / Lapsed | 1975-04-03 | 1977-03-29 | 9 | Details |
| US3992726A | Endoprosthetic bone joint devices | Expired / Lapsed | 1975-07-30 | 1976-11-23 | 9 | Details |
| US3987673A | Ultrasonic transducer devices | Expired / Lapsed | 1975-01-03 | 1976-10-26 | 18 | Details |
| US3977289A | Saws and blades therefor | Expired / Lapsed | 1975-04-24 | 1976-08-31 | 3 | Details |
| US3962205A | Polymer materials | Expired / Lapsed | 1974-03-06 | 1976-06-08 | 10 | Details |
| US3958565A | Ventilatory capacity measuring instrument | Expired / Lapsed | 1974-07-12 | 1976-05-25 | 4 | Details |
| US3949428A | Prosthetic bone joint devices | Expired / Lapsed | 1974-09-03 | 1976-04-13 | 12 | Details |
| US3946445A | Endoprosthetic bone joint | Expired / Lapsed | 1975-04-30 | 1976-03-30 | 8 | Details |
| US3938379A | Electromechanical transducer | Expired / Lapsed | 1974-01-10 | 1976-02-17 | 25 | Details |
| US3937952A | Keyboard and switches for keyboards | Expired / Lapsed | 1974-12-30 | 1976-02-10 | 7 | Details |
| US3936336A | Method of forming reinforced plastics articles utilizing op… | Expired / Lapsed | 1970-10-23 | 1976-02-03 | 11 | Details |
| US3924277A | Knee joint prosthesis | Expired / Lapsed | 1974-03-04 | 1975-12-09 | 27 | Details |
| US3911902A | Catheter pressure transducer | Expired / Lapsed | 1973-08-23 | 1975-10-14 | 13 | Details |
| US3909853A | Endoprosthetic wrist joint | Expired / Lapsed | 1974-05-15 | 1975-10-07 | 15 | Details |
| US3905105A | Saws and blades therefor | Expired / Lapsed | 1974-01-07 | 1975-09-16 | 11 | Details |
| US3896503A | Endosphosthetic ankle joint devices | Expired / Lapsed | 1974-02-06 | 1975-07-29 | 7 | Details |
| US3889299A | Prosthetic hip joint devices | Expired / Lapsed | 1974-01-07 | 1975-06-17 | 14 | Details |
| US3889665A | Apparatus and method for pressurizing gap-filling cement to… | Expired / Lapsed | 1973-03-07 | 1975-06-17 | 15 | Details |
| US3886801A | Decompression meter | Expired / Lapsed | 1973-10-30 | 1975-06-03 | 10 | Details |
| US3870051A | Urinary control | Expired / Lapsed | 1973-04-26 | 1975-03-11 | 19 | Details |
| US3862425A | Radiation position detectors | Expired / Lapsed | 1973-03-05 | 1975-01-21 | 12 | Details |
| US3852831A | Endoprosthetic elbow joint | Expired / Lapsed | 1974-01-29 | 1974-12-10 | 11 | Details |
| US3853712A | Cell culture systems | Expired / Lapsed | 1972-02-08 | 1974-12-10 | 15 | Details |
| US3842442A | Endoprosthetic shoulder joint | Expired / Lapsed | 1973-09-04 | 1974-10-22 | 14 | Details |
| US3840905A | Endoprosthetic knee joint | Expired / Lapsed | 1973-09-17 | 1974-10-15 | 11 | Details |
| US3840014A | Retractor for hip joint surgery | Expired / Lapsed | 1972-09-22 | 1974-10-08 | 10 | Details |
| US3829904A | Hip joint prostheses | Expired / Lapsed | 1972-09-22 | 1974-08-20 | 13 | Details |
| US3816855A | Knee joint prosthesis | Expired / Lapsed | 1972-05-30 | 1974-06-18 | 11 | Details |
| US3816649A | Optical inspection | Expired / Lapsed | 1972-06-19 | 1974-06-11 | 30 | Details |
| US3814082A | Patient monitoring systems | Expired / Lapsed | 1972-03-17 | 1974-06-04 | 9 | Details |
| US3807394A | Fracture fixing device | Expired / Lapsed | 1972-08-03 | 1974-04-30 | 13 | Details |
| CA943752A | Inhibition of corrosion | Expired / Lapsed | 1970-12-17 | 1974-03-19 | 0 | Details |
| US3793650A | Prosthetic bone joint having a spacer device | Expired / Lapsed | 1972-09-22 | 1974-02-26 | 3 | Details |
| US3762416A | Artery entry tool | Expired / Lapsed | 1971-05-26 | 1973-10-02 | 5 | Details |
| US3751391A | Zinc oxide-poly(acrylic acid)surgical cements | Expired / Lapsed | 1971-10-28 | 1973-08-07 | 0 | Details |
| US3742433A | Detection apparatus | Expired / Lapsed | 1971-06-18 | 1973-06-26 | 5 | Details |
| US3718134A | Implantable electrode connector device | Expired / Lapsed | 1971-04-13 | 1973-02-27 | 6 | Details |
| US3705765A | Apparatus for use in focussing images | Expired / Lapsed | 1970-01-23 | 1972-12-12 | 22 | Details |
| US3698017A | Prosthetic acetabular devices | Expired / Lapsed | 1970-07-29 | 1972-10-17 | 7 | Details |
| US3694820A | Prosthetic shoulder joint | Expired / Lapsed | 1970-07-29 | 1972-10-03 | 9 | Details |
| US3685509A | Foetal blood sampling endoscope | Expired / Lapsed | 1970-07-07 | 1972-08-22 | 7 | Details |
| US3686022A | Production of films by vapor deposition and irradiation | Expired / Lapsed | 1969-12-29 | 1972-08-22 | 0 | Details |
| US3684405A | Apparatus for pumping a fluid | Expired / Lapsed | 1970-06-12 | 1972-08-15 | 7 | Details |
| US3675472A | Apparatus and method for images of the interior structure o… | Expired / Lapsed | 1969-12-11 | 1972-07-11 | 7 | Details |
| US3550446A | Electromagnetic flowmeters | Expired / Lapsed | 1969-02-28 | 1970-12-29 | 0 | Details |
| US3547539A | Distance measurement | Expired / Lapsed | 1967-11-24 | 1970-12-15 | 0 | Details |
| US3529170A | Apparatus for signalling the instantaneous position of an o… | Expired / Lapsed | 1966-08-05 | 1970-09-15 | 0 | Details |
| US3513931A | Vehicle automatic guidance means | Expired / Lapsed | 1967-07-26 | 1970-05-26 | 0 | Details |
| US3509807A | Photographic apparatus | Expired / Lapsed | 1967-05-15 | 1970-05-05 | 0 | Details |
| US3508828A | Distance measuring apparatus | Expired / Lapsed | 1966-11-14 | 1970-04-28 | 0 | Details |
| US3505993A | Electrocardiograph electrodes with surface convexities | Expired / Lapsed | 1965-12-17 | 1970-04-14 | 0 | Details |
| US3488690A | Artificial kidney membrane support means | Expired / Lapsed | 1967-10-11 | 1970-01-06 | 0 | Details |
| US3486500A | Osteotomy plate | Expired / Lapsed | 1966-09-14 | 1969-12-30 | 0 | Details |
| US3487331A | Q-switched laser light sources | Expired / Lapsed | 1966-05-09 | 1969-12-30 | 0 | Details |
| US3476703A | Treatment of carbon fibres and composite materials includin… | Expired / Lapsed | 1968-02-16 | 1969-11-04 | 0 | Details |
| US3474248A | Three-dimensional visual display systems | Expired / Lapsed | 1965-03-30 | 1969-10-21 | 0 | Details |
| US3450450A | Pressure resisting seal | Expired / Lapsed | 1967-03-03 | 1969-06-17 | 0 | Details |
| US3448310A | Dynamo-electric machines of the reluctance type | Expired / Lapsed | 1967-08-15 | 1969-06-03 | 0 | Details |
| US3435329A | Scr type alternating current electric power control | Expired / Lapsed | 1966-03-15 | 1969-03-25 | 0 | Details |
| US3431996A | Vehicle guidance system | Expired / Lapsed | 1965-09-20 | 1969-03-11 | 0 | Details |
| US3426663A | Intra-tubular cameras | Expired / Lapsed | 1966-03-08 | 1969-02-11 | 0 | Details |
| US3404344A | Time measuring circuits | Expired / Lapsed | 1965-05-10 | 1968-10-01 | 0 | Details |
| US3399478A | Animal identification tags | Expired / Lapsed | 1966-10-21 | 1968-09-03 | 2 | Details |
| US3400216A | Speech recognition apparatus | Expired / Lapsed | 1965-02-01 | 1968-09-03 | 0 | Details |
| US3398481A | Method and apparatus for controlling carbon dioxide concent… | Expired / Lapsed | 1966-05-20 | 1968-08-27 | 0 | Details |
| US3396409A | Artificial heart valve | Expired / Lapsed | 1965-12-09 | 1968-08-13 | 2 | Details |
| US3381672A | Impulse forming and like machines | Expired / Lapsed | 1966-04-04 | 1968-05-07 | 0 | Details |
| US3369228A | Environment identification system | Expired / Lapsed | 1964-08-26 | 1968-02-13 | 2 | Details |
| US3366922A | Blind aid | Expired / Lapsed | 1966-04-11 | 1968-01-30 | 0 | Details |
| US3365840A | Crop growing device | Expired / Lapsed | 1965-11-15 | 1968-01-30 | 1 | Details |
| US3349377A | Electrical digital computing engines | Expired / Lapsed | 1964-07-13 | 1967-10-24 | 2 | Details |
| US3324237A | Television and like data transmission systems | Expired / Lapsed | 1963-08-26 | 1967-06-06 | 2 | Details |
| US3319622A | Device for gastro-intestinal fluids | Expired / Lapsed | 1963-12-26 | 1967-05-16 | 2 | Details |
| US3299204A | Television and like data transmission systems | Expired / Lapsed | 1963-06-26 | 1967-01-17 | 2 | Details |
| US3276822A | Braking of motor vehicles | Expired / Lapsed | 1964-06-22 | 1966-10-04 | 2 | Details |
| US3265144A | Inflatable flexible structure | Expired / Lapsed | 1964-08-10 | 1966-08-09 | 2 | Details |
| US3222667A | Core matrix for control of crt having forward and reverse w… | Expired / Lapsed | 1962-04-24 | 1965-12-07 | 2 | Details |
| US3206642A | Electrical circuit breakers | Expired / Lapsed | 1962-07-17 | 1965-09-14 | 2 | Details |
| US3200727A | Camera rangefinders | Expired / Lapsed | 1960-09-12 | 1965-08-17 | 2 | Details |
| US3172075A | Apparatus for furnishing information as to positioning of o… | Expired / Lapsed | 1962-01-02 | 1965-03-02 | 2 | Details |
| US3153111A | Measurement of displacements | Expired / Lapsed | 1959-06-26 | 1964-10-13 | 2 | Details |
| US3144390A | Process for the purification of interferon | Expired / Lapsed | 1961-06-21 | 1964-08-11 | 2 | Details |
| US3138955A | Fluid measuring apparatus | Expired / Lapsed | 1961-05-08 | 1964-06-30 | 2 | Details |
| US3101285A | Fuel cells | Expired / Lapsed | 1961-03-27 | 1963-08-20 | 2 | Details |
| US3099833A | Method of radio scanning | Expired / Lapsed | 1959-03-17 | 1963-07-30 | 2 | Details |
| US3098383A | Method and means for determining gas flow velocity | Expired / Lapsed | 1960-09-22 | 1963-07-23 | 2 | Details |
| US3073311A | Sewing device | Expired / Lapsed | 1959-11-02 | 1963-01-15 | 2 | Details |
| US3050997A | Flowmeters | Expired / Lapsed | 1959-06-03 | 1962-08-28 | 0 | Details |
| US3045911A | Automatic control systems | Expired / Lapsed | 1957-07-01 | 1962-07-24 | 0 | Details |
| US3015612A | Continuous fermentation apparatus for the production of a c… | Expired / Lapsed | 1958-02-18 | 1962-01-02 | 2 | Details |
| US3006991A | Signal transmission systems | Expired / Lapsed | 1959-10-02 | 1961-10-31 | 0 | Details |
| US3004077A | Manufacture of fluorinated aromatic compounds | Expired / Lapsed | 1959-09-04 | 1961-10-10 | 2 | Details |
| US3000976A | Manufacture of fluorinated aromatic compounds | Expired / Lapsed | 1959-10-30 | 1961-09-19 | 2 | Details |
| US2996649A | Motor control system | Expired / Lapsed | 1960-04-18 | 1961-08-15 | 0 | Details |
| US2983859A | On-off control systems with fast time scale computer | Expired / Lapsed | 1956-05-18 | 1961-05-09 | 0 | Details |
| US2979623A | Velocity indicator | Expired / Lapsed | 1959-06-26 | 1961-04-11 | 0 | Details |
| US2958860A | Digital encoders | Expired / Lapsed | 1956-08-01 | 1960-11-01 | 0 | Details |
| US2952040A | Moulding of synthetic resinous materials | Expired / Lapsed | 1953-11-10 | 1960-09-13 | 1 | Details |
| US2948637A | Process of sulfonating a plasticized polyvinyl chloride fil… | Expired / Lapsed | 1957-12-23 | 1960-08-09 | 2 | Details |
| US2931958A | Semi-conductor devices | Expired / Lapsed | 1955-04-19 | 1960-04-05 | 0 | Details |
| US2929949A | Method of and apparatus for electron multiplication | Expired / Lapsed | 1957-02-08 | 1960-03-22 | 0 | Details |
| US2907889A | Fog detecting and visibility measuring systems | Expired / Lapsed | 1956-09-21 | 1959-10-06 | 0 | Details |
| US2902217A | Control gating means for a digital computer | Expired / Lapsed | 1954-02-01 | 1959-09-01 | 0 | Details |
| US2891723A | Programmed control means for data transfer apparatus | Expired / Lapsed | 1952-05-26 | 1959-06-23 | 0 | Details |
| US2856573A | Induction motors | Expired / Lapsed | 1954-12-20 | 1958-10-14 | 0 | Details |
| US2856126A | Multiplying arrangements for electronic digital computing m… | Expired / Lapsed | 1954-04-13 | 1958-10-14 | 0 | Details |
| CA562125A | Magnetic storage systems | Expired / Lapsed | — | 1958-08-19 | 0 | Details |
| US2846142A | Electronic digital computing engines | Expired / Lapsed | 1954-08-25 | 1958-08-05 | 0 | Details |
| US2845609A | Methods of recording digital information | Expired / Lapsed | 1951-11-13 | 1958-07-29 | 0 | Details |
| US2840069A | Penetrating instruments such as hypodermic needles and thei… | Expired / Lapsed | 1955-09-22 | 1958-06-24 | 0 | Details |
| US2840798A | Magnetic storage system | Expired / Lapsed | 1952-02-19 | 1958-06-24 | 0 | Details |
| US2840305A | Rhythm control means for electronic digital computing machi… | Expired / Lapsed | 1951-05-17 | 1958-06-24 | 0 | Details |
| US2840304A | Data storage arrangements for electronic digital computing … | Expired / Lapsed | 1951-05-17 | 1958-06-24 | 0 | Details |
| US2833857A | Frequency shift signalling system | Expired / Lapsed | 1956-02-06 | 1958-05-06 | 0 | Details |
| US2832259A | Optical measuring systems | Expired / Lapsed | 1956-02-14 | 1958-04-29 | 0 | Details |
| US2825687A | Transparent conducting films | Expired / Lapsed | 1953-04-01 | 1958-03-04 | 2 | Details |
| US2816163A | Synchronizing system for signal receivers | Expired / Lapsed | 1950-12-11 | 1957-12-10 | 0 | Details |
| US2811202A | Program controller | Expired / Lapsed | 1953-07-14 | 1957-10-29 | 0 | Details |
| US2810516A | Electronic digital computing devices | Expired / Lapsed | 1950-06-01 | 1957-10-22 | 0 | Details |
| US2809905A | Melting and refining metals | Expired / Lapsed | 1956-12-21 | 1957-10-15 | 2 | Details |
| US2807728A | Digital data storage systems | Expired / Lapsed | 1951-04-03 | 1957-09-24 | 0 | Details |
| US2800055A | Micromanipulating devices | Expired / Lapsed | 1954-04-09 | 1957-07-23 | 0 | Details |
| US2800277A | Controlling arrangements for electronic digital computing m… | Expired / Lapsed | 1951-05-17 | 1957-07-23 | 0 | Details |
| US2800278A | Number signal analysing means for electronic digital comput… | Expired / Lapsed | 1951-05-17 | 1957-07-23 | 0 | Details |
| US2799449A | Data storage transfer means for a digital computer | Expired / Lapsed | 1951-04-23 | 1957-07-16 | 0 | Details |
| US2795729A | Cathode ray tube | Expired / Lapsed | 1955-11-29 | 1957-06-11 | 0 | Details |
| US2789759A | Electronic digital computing machines | Expired / Lapsed | 1950-06-21 | 1957-04-23 | 0 | Details |
| US2788320A | Pesticidal coating compositions | Expired / Lapsed | 1953-07-15 | 1957-04-09 | 2 | Details |
| US2786628A | Electronic digital computing devices | Expired / Lapsed | 1951-04-11 | 1957-03-26 | 0 | Details |
| US2785855A | Electrical storage apparatus | Expired / Lapsed | 1950-11-24 | 1957-03-19 | 0 | Details |
| US2784925A | Means for aiding the landing of aircraft | Expired / Lapsed | 1955-02-16 | 1957-03-12 | 0 | Details |
| US2783374A | Electrical gate circuits | Expired / Lapsed | 1954-03-09 | 1957-02-26 | 0 | Details |
| US2777635A | Electronic digital computing machines | Expired / Lapsed | 1950-08-14 | 1957-01-15 | 0 | Details |
| US2776794A | Electronic circuit for multiplying binary numbers | Expired / Lapsed | 1950-03-13 | 1957-01-08 | 0 | Details |
| US2772050A | Electronic digital computing machines | Expired / Lapsed | 1950-06-21 | 1956-11-27 | 0 | Details |
| US2770166A | Improvements in and relating to optical apparatus for produ… | Expired / Lapsed | 1952-06-30 | 1956-11-13 | 0 | Details |
| US2767908A | Electronic digital computing machines | Expired / Lapsed | 1951-08-14 | 1956-10-23 | 0 | Details |
| US2757864A | Information translating apparatus | Expired / Lapsed | 1951-08-28 | 1956-08-07 | 0 | Details |
| US2750499A | Circuits for ultrasonic delay lines | Expired / Lapsed | 1951-01-08 | 1956-06-12 | 0 | Details |
| US2730676A | Pulse code systems | Expired / Lapsed | 1952-01-02 | 1956-01-10 | 0 | Details |
| US2728219A | Means for measuring the density of a fluid | Expired / Lapsed | 1954-08-25 | 1955-12-27 | 2 | Details |
| US2721732A | Apparatus for mixing liquids and gases | Expired / Lapsed | 1952-12-23 | 1955-10-25 | 2 | Details |
| US2715712A | Integrating circuits | Expired / Lapsed | 1950-08-16 | 1955-08-16 | 0 | Details |
| US2701303A | Electronic valve circuits | Expired / Lapsed | 1950-03-01 | 1955-02-01 | 0 | Details |
| US2700696A | Electrical signaling and/or amplifying systems | Expired / Lapsed | 1951-06-07 | 1955-01-25 | 0 | Details |
| US2700588A | Digital computing machine | Expired / Lapsed | 1950-11-10 | 1955-01-25 | 0 | Details |
| US2700155A | Electrical signaling system | Expired / Lapsed | 1954-04-19 | 1955-01-18 | 0 | Details |
| US2686632A | Digital computer | Expired / Lapsed | 1950-12-26 | 1954-08-17 | 0 | Details |
| US2685407A | Circuit for multiplying binary numbers | Expired / Lapsed | 1949-12-12 | 1954-08-03 | 0 | Details |
| US2685041A | Apparatus for examining materials by ultrasonic shear vibra… | Expired / Lapsed | 1951-11-13 | 1954-07-27 | 0 | Details |
| US2683802A | Pulse selecting circuits | Expired / Lapsed | 1949-12-12 | 1954-07-13 | 0 | Details |
| US2679978A | Pulse scaling system | Expired / Lapsed | 1951-01-19 | 1954-06-01 | 0 | Details |
| US2671376A | Spectroscopic apparatus with ruled cylinder as the dispersi… | Expired / Lapsed | 1951-08-21 | 1954-03-09 | 0 | Details |
| US2671607A | Electronic digital computing apparatus | Expired / Lapsed | 1949-10-03 | 1954-03-09 | 0 | Details |
| US2660922A | Interference microscope | Expired / Lapsed | 1949-05-31 | 1953-12-01 | 0 | Details |
| US2652554A | Magnetic storage system for electronic binary digital compu… | Expired / Lapsed | 1950-02-27 | 1953-09-15 | 0 | Details |
| US2651717A | Electronic valve circuits | Expired / Lapsed | 1950-06-12 | 1953-09-08 | 0 | Details |
| US2648061A | Cathode-ray tube display system | Expired / Lapsed | 1947-12-29 | 1953-08-04 | 0 | Details |
| US2643820A | Circuit for adding binary numbers | Expired / Lapsed | 1949-12-12 | 1953-06-30 | 0 | Details |
| US2642550A | Electronic information storage device | Expired / Lapsed | 1951-01-11 | 1953-06-16 | 0 | Details |
| US2636983A | Pulse analyzer | Expired / Lapsed | 1948-05-20 | 1953-04-28 | 0 | Details |
| US2562987A | Utility radar system | Expired / Lapsed | 1947-07-30 | 1951-08-07 | 0 | Details |
| US2552022A | Expanded sweep and calibrated marker for cathode-ray tube t… | Expired / Lapsed | 1947-07-30 | 1951-05-08 | 0 | Details |
| US2552009A | Expanded sweep and calibrated cathode-ray tube trace | Expired / Lapsed | 1947-07-30 | 1951-05-08 | 0 | Details |