Unisys Corp
Unisys CorActive Patents
0
Total Holdings
714
Patent Holdings
Filter in Explorer →| Patent No. | Title | Status | Filing Date | Grant Date | Claims | Actions |
|---|---|---|---|---|---|---|
| DE3003398A1 | Computer-controlled connecting union for fluids - consists … | Expired / Lapsed | 1980-01-31 | — | 0 | Details |
| GB2020037A | Apparatus for and method of compensation for errors in theh… | Expired / Lapsed | 1979-04-27 | — | 0 | Details |
| GB1003641A | Computer input-output system | Expired / Lapsed | 1962-07-12 | — | 0 | Details |
| GB749836A | Electronic system for computing and otherwise handling info… | Expired / Lapsed | 1953-03-30 | — | 0 | Details |
| GB736144A | Binary automatic computer | Expired / Lapsed | 1951-08-15 | — | 0 | Details |
| GB560834A | Improvements in or relating to machines for perforating sta… | Expired / Lapsed | 1942-10-16 | — | 0 | Details |
| US5030128A | Docking module | Expired / Lapsed | 1989-03-06 | 1991-07-09 | 13 | Details |
| US4949149A | Semicustom chip whose logic cells have narrow tops and wide… | Expired / Lapsed | 1987-03-31 | 1990-08-14 | 15 | Details |
| US4688041A | Baseband detector with anti-jam capability | Expired / Lapsed | 1981-10-08 | 1987-08-18 | 6 | Details |
| US4656484A | Radar reflector and scanner with electromagnetic programmab… | Expired / Lapsed | 1985-08-05 | 1987-04-07 | 8 | Details |
| USD287724S | Modular computer system | Expired / Lapsed | 1984-05-09 | 1987-01-13 | 1 | Details |
| US4629178A | Document conveyor system | Expired / Lapsed | 1984-03-27 | 1986-12-16 | 45 | Details |
| US4620813A | Position retaining mechanism | Expired / Lapsed | 1984-10-09 | 1986-11-04 | 6 | Details |
| US4564757A | Mirror position sensor for improved track selection in opti… | Expired / Lapsed | 1982-09-30 | 1986-01-14 | 21 | Details |
| US4538241A | Address translation buffer | Expired / Lapsed | 1983-07-14 | 1985-08-27 | 10 | Details |
| US4494192A | High speed bus architecture | Expired / Lapsed | 1982-07-21 | 1985-01-15 | 23 | Details |
| US4443799A | Spread spectrum radar | Expired / Lapsed | 1981-07-02 | 1984-04-17 | 11 | Details |
| US4432599A | Fiber optic differential sensor | Expired / Lapsed | 1981-03-27 | 1984-02-21 | 8 | Details |
| US4429389A | Test pattern address generator | Expired / Lapsed | 1981-05-26 | 1984-01-31 | 14 | Details |
| US4410944A | Apparatus and method for maintaining cache memory integrity… | Expired / Lapsed | 1981-03-24 | 1983-10-18 | 7 | Details |
| US4394733A | Cache/disk subsystem | Expired / Lapsed | 1980-11-14 | 1983-07-19 | 18 | Details |
| US4313162A | I/O Subsystem using data link processors | Expired / Lapsed | 1979-12-14 | 1982-01-26 | 15 | Details |
| US4302835A | Multiple terminal passive multiplexing apparatus | Expired / Lapsed | 1980-01-24 | 1981-11-24 | 10 | Details |
| US4296406A | Pressure sensitive switch structure | Expired / Lapsed | 1979-12-28 | 1981-10-20 | 7 | Details |
| US4291976A | Digital fiber optic position sensor | Expired / Lapsed | 1980-03-10 | 1981-09-29 | 8 | Details |
| US4270862A | Magneto-optic light deflector system | Expired / Lapsed | 1979-01-29 | 1981-06-02 | 11 | Details |
| US4259961A | Cooling pad | Expired / Lapsed | 1979-01-24 | 1981-04-07 | 9 | Details |
| US4253144A | Multi-processor communication network | Expired / Lapsed | 1978-12-21 | 1981-02-24 | 18 | Details |
| US4228503A | Multiplexed directory for dedicated cache memory system | Expired / Lapsed | 1978-10-02 | 1980-10-14 | 12 | Details |
| US4225935A | Coding method and system with enhanced security | Expired / Lapsed | 1977-08-30 | 1980-09-30 | 18 | Details |
| US4166211A | Error control system for named data | Expired / Lapsed | 1978-04-03 | 1979-08-28 | 5 | Details |
| US4160124A | Multiple dial adapter | Expired / Lapsed | 1977-05-31 | 1979-07-03 | 7 | Details |
| US4155119A | Method for providing virtual addressing for externally spec… | Expired / Lapsed | 1977-09-21 | 1979-05-15 | 10 | Details |
| US4139147A | Asynchronous digital circuit testing and diagnosing system | Expired / Lapsed | 1977-09-02 | 1979-02-13 | 19 | Details |
| US4128875A | Optional virtual memory system | Expired / Lapsed | 1976-12-16 | 1978-12-05 | 20 | Details |
| US4107664A | Raster scanned display system | Expired / Lapsed | 1976-07-06 | 1978-08-15 | 10 | Details |
| US4097797A | Apparatus for testing electrical circuit units such as prin… | Expired / Lapsed | 1976-06-07 | 1978-06-27 | 12 | Details |
| US4087809A | Magneto-optic bubble domain histograph | Expired / Lapsed | 1976-07-12 | 1978-05-02 | 4 | Details |
| US4085330A | Focused ion beam mask maker | Expired / Lapsed | 1977-05-19 | 1978-04-18 | 26 | Details |
| US4084225A | Virtual address translator | Expired / Lapsed | 1976-09-24 | 1978-04-11 | 13 | Details |
| US4084260A | Best match content addressable memory | Expired / Lapsed | 1976-07-12 | 1978-04-11 | 4 | Details |
| US4070706A | Parallel requestor priority determination and requestor add… | Expired / Lapsed | 1976-09-20 | 1978-01-24 | 6 | Details |
| US4057847A | Remote controlled test interface unit | Expired / Lapsed | 1976-06-14 | 1977-11-08 | 16 | Details |
| US4046961A | Conditioning system for transducer signals | Expired / Lapsed | 1976-03-04 | 1977-09-06 | 37 | Details |
| US4039813A | Apparatus and method for diagnosing digital data devices | Expired / Lapsed | 1976-04-07 | 1977-08-02 | 19 | Details |
| US4034349A | Apparatus for processing interrupts in microprocessing syst… | Expired / Lapsed | 1976-01-29 | 1977-07-05 | 13 | Details |
| US4031512A | Communications network for general purpose data communicati… | Expired / Lapsed | 1975-05-29 | 1977-06-21 | 19 | Details |
| US4009470A | Pre-emptive, rotational priority system | Expired / Lapsed | 1975-02-18 | 1977-02-22 | 14 | Details |
| US4007441A | Method of data communications in a heterogenous environment | Expired / Lapsed | 1975-05-29 | 1977-02-08 | 9 | Details |
| US3987293A | Programmable general purpose analog filter | Expired / Lapsed | 1975-08-04 | 1976-10-19 | 11 | Details |
| US3983468A | Motor drive system including a feedback loop | Expired / Lapsed | 1974-12-30 | 1976-09-28 | 32 | Details |
| US3967247A | Storage interface unit | Expired / Lapsed | 1974-11-11 | 1976-06-29 | 4 | Details |
| US3965430A | Electronic peak sensing digitizer for optical tachometers | Expired / Lapsed | 1975-06-18 | 1976-06-22 | 11 | Details |
| US3943493A | Shared processor data entry system | Expired / Lapsed | 1974-03-13 | 1976-03-09 | 15 | Details |
| US3935565A | Signal generator comprising an addressable memory | Expired / Lapsed | 1974-08-19 | 1976-01-27 | 7 | Details |
| US3921164A | Character generator for a high resolution dot matrix display | Expired / Lapsed | 1974-06-03 | 1975-11-18 | 11 | Details |
| US3921145A | Multirequest grouping computer interface | Expired / Lapsed | 1973-10-12 | 1975-11-18 | 5 | Details |
| US3919692A | Fast inhibit gate with applications | Expired / Lapsed | 1972-12-01 | 1975-11-11 | 12 | Details |
| US3917933A | Error logging in LSI memory storage units using FIFO memory… | Expired / Lapsed | 1974-12-17 | 1975-11-04 | 6 | Details |
| US3914677A | Precision motion control device or the like | Expired / Lapsed | 1973-06-08 | 1975-10-21 | 12 | Details |
| US3905023A | Large scale multi-level information processing system emplo… | Expired / Lapsed | 1973-08-15 | 1975-09-09 | 3 | Details |
| US3889237A | Common storage controller for dual processor system | Expired / Lapsed | 1973-11-16 | 1975-06-10 | 22 | Details |
| US3886532A | Integrated four-phase digital memory circuit with decoders | Expired / Lapsed | 1974-05-08 | 1975-05-27 | 10 | Details |
| US3872496A | High frequency diode having simultaneously formed high stre… | Expired / Lapsed | 1973-09-13 | 1975-03-18 | 6 | Details |
| US3856998A | Keyboard switch assembly with improved operating means | Expired / Lapsed | 1973-06-01 | 1974-12-24 | 30 | Details |
| US3851161A | Continuity network testing and fault isolating | Expired / Lapsed | 1973-05-07 | 1974-11-26 | 54 | Details |
| US3849631A | Punched card, badge and credit card reader | Expired / Lapsed | 1971-03-04 | 1974-11-19 | 24 | Details |
| US3848234A | Multi-processor system with multiple cache memories | Expired / Lapsed | 1973-04-04 | 1974-11-12 | 18 | Details |
| US3836792A | Four stage storage enhanced logic circuit | Expired / Lapsed | 1971-10-06 | 1974-09-17 | 17 | Details |
| US3824564A | Integrated threshold mnos memory with decoder and operating… | Expired / Lapsed | 1973-07-19 | 1974-07-16 | 11 | Details |
| US3810019A | Multifrequency communication system for fading channels | Expired / Lapsed | 1972-09-25 | 1974-05-07 | 10 | Details |
| US3787810A | Test method for a programmable data communication terminal | Expired / Lapsed | 1972-11-02 | 1974-01-22 | 14 | Details |
| US3771143A | Method and apparatus for providing alternate storage areas … | Expired / Lapsed | 1972-06-01 | 1973-11-06 | 13 | Details |
| US3768074A | Multiprocessing system having means for permissive coupling… | Expired / Lapsed | 1972-05-12 | 1973-10-23 | 15 | Details |
| US3766477A | Spread spectrum, linear fm communications system | Expired / Lapsed | 1971-12-20 | 1973-10-16 | 13 | Details |
| US3763430A | Circuit testing method and apparatus | Expired / Lapsed | 1972-01-14 | 1973-10-02 | 34 | Details |
| US3761155A | Faraday effect page composer for holographic memory system | Expired / Lapsed | 1971-12-27 | 1973-09-25 | 4 | Details |
| US3760414A | Base band vehicle safety apparatus | Expired / Lapsed | 1971-10-22 | 1973-09-18 | 22 | Details |
| US3753014A | Fast inhibit gate with applications | Expired / Lapsed | 1971-03-15 | 1973-08-14 | 6 | Details |
| US3749940A | Keyboard strobe filter for static keyboards | Expired / Lapsed | 1972-04-21 | 1973-07-31 | 5 | Details |
| US3748447A | Apparatus for performing a linear interpolation algorithm | Expired / Lapsed | 1971-11-18 | 1973-07-24 | 11 | Details |
| US3732390A | Keyswitch | Expired / Lapsed | 1971-12-27 | 1973-05-08 | 4 | Details |
| US3728693A | Programmatically controlled interrupt system for controllin… | Expired / Lapsed | 1972-04-28 | 1973-04-17 | 28 | Details |
| US3725872A | Data processing system having status indicating and storage… | Expired / Lapsed | 1971-03-03 | 1973-04-03 | 34 | Details |
| US3725789A | Temperature controlled clocking of logic circuits | Expired / Lapsed | 1970-12-21 | 1973-04-03 | 8 | Details |
| US3721919A | High efficiency mode planar microcircuit high frequency sig… | Expired / Lapsed | 1972-03-13 | 1973-03-20 | 10 | Details |
| US3721882A | Positioning system | Expired / Lapsed | 1971-06-25 | 1973-03-20 | 10 | Details |
| US3717873A | Ship's maneuver assessment system | Expired / Lapsed | 1970-11-05 | 1973-02-20 | 12 | Details |
| US3697711A | Snap action switch | Expired / Lapsed | 1971-06-29 | 1972-10-10 | 2 | Details |
| US3693161A | Apparatus for interrogating the availability of a communica… | Expired / Lapsed | 1970-07-09 | 1972-09-19 | 7 | Details |
| US3691535A | Solid state memory array | Expired / Lapsed | 1970-06-15 | 1972-09-12 | 8 | Details |
| US3688273A | Digital data communication system providing a recirculating… | Expired / Lapsed | 1970-11-09 | 1972-08-29 | 14 | Details |
| US3685012A | Apparatus for determining data associated with objects | Expired / Lapsed | 1970-04-16 | 1972-08-15 | 31 | Details |
| US3683273A | Method and apparatus for measuring fluid film bearings | Expired / Lapsed | 1970-02-27 | 1972-08-08 | 16 | Details |
| US3674331A | Space division multiplexed holographic apparatus | Expired / Lapsed | 1970-10-09 | 1972-07-04 | 0 | Details |
| US3675201A | Threshold voltage determination system | Expired / Lapsed | 1970-02-24 | 1972-07-04 | 4 | Details |
| US3675209A | Autonomous multiple-path input/output control system | Expired / Lapsed | 1970-02-06 | 1972-07-04 | 26 | Details |
| US3668644A | Failsafe memory system | Expired / Lapsed | 1970-02-09 | 1972-06-06 | 10 | Details |
| US3665421A | Information processing system implementing program structur… | Expired / Lapsed | 1969-11-28 | 1972-05-23 | 13 | Details |
| US3654486A | Transistor logic circuit with upset feedback | Expired / Lapsed | 1970-05-26 | 1972-04-04 | 15 | Details |
| US3648253A | Program scheduler for processing systems | Expired / Lapsed | 1969-12-10 | 1972-03-07 | 76 | Details |
| US3646519A | Method and apparatus for testing logic functions in a multi… | Expired / Lapsed | 1970-02-02 | 1972-02-29 | 6 | Details |
| US3642375A | Optical combiner | Expired / Lapsed | 1969-10-02 | 1972-02-15 | 9 | Details |
| US3638198A | Priority resolution network for input/output exchange | Expired / Lapsed | 1969-07-09 | 1972-01-25 | 10 | Details |
| US3636521A | Programming system | Expired / Lapsed | 1970-08-21 | 1972-01-18 | 20 | Details |
| US3633084A | Brushless dc motor having automatic braking | Expired / Lapsed | 1970-06-24 | 1972-01-04 | 8 | Details |
| US3631421A | Data storage addressing system | Expired / Lapsed | 1968-09-23 | 1971-12-28 | 30 | Details |
| US3629854A | Modular multiprocessor system with recirculating priority | Expired / Lapsed | 1969-07-22 | 1971-12-21 | 6 | Details |
| US3626382A | Data processing terminal unit | Expired / Lapsed | 1969-11-19 | 1971-12-07 | 9 | Details |
| US3623013A | Data processing network and improved terminal | Expired / Lapsed | 1969-08-13 | 1971-11-23 | 13 | Details |
| US3622995A | Automatic ticket/credit card check-in system | Expired / Lapsed | 1969-03-21 | 1971-11-23 | 20 | Details |
| US3616532A | Multilayer printed circuit electrical interconnection device | Expired / Lapsed | 1970-02-02 | 1971-11-02 | 0 | Details |
| US3618037A | Digital data communication multiple line control | Expired / Lapsed | 1969-09-19 | 1971-11-02 | 17 | Details |
| US3617724A | Shifted sequence pseudo random coded reticle correlation ap… | Expired / Lapsed | 1968-04-04 | 1971-11-02 | 7 | Details |
| US3610730A | Fluidic prism | Expired / Lapsed | 1969-10-23 | 1971-10-05 | 17 | Details |
| US3611417A | High-density magnetic recording method | Expired / Lapsed | 1969-07-30 | 1971-10-05 | 6 | Details |
| US3611306A | Mechanism to control the sequencing of partially ordered in… | Expired / Lapsed | 1969-02-05 | 1971-10-05 | 10 | Details |
| US3609665A | Apparatus for exchanging information between a high-speed m… | Expired / Lapsed | 1970-03-19 | 1971-09-28 | 14 | Details |
| US3605025A | Fractional output frequency-dividing apparatus | Expired / Lapsed | 1969-06-30 | 1971-09-14 | 4 | Details |
| US3603756A | Snap action switch | Expired / Lapsed | 1970-01-29 | 1971-09-07 | 4 | Details |
| US3601756A | Terminator connector for multiconductor cable | Expired / Lapsed | 1969-08-14 | 1971-08-24 | 11 | Details |
| US3598974A | Programmable digital differential analyzer integrator | Expired / Lapsed | 1967-09-15 | 1971-08-10 | 28 | Details |
| US3597752A | Fm magnetic recording and sensing utilizing bit periods of … | Expired / Lapsed | 1969-09-17 | 1971-08-03 | 42 | Details |
| US3579795A | Component removing tool | Expired / Lapsed | 1969-08-08 | 1971-05-25 | 21 | Details |
| US3581268A | Electrical connection and distribution system | Expired / Lapsed | 1969-04-01 | 1971-05-25 | 7 | Details |
| US3578846A | Multiple-stage optical information processing system | Expired / Lapsed | 1969-01-31 | 1971-05-18 | 3 | Details |
| US3575658A | Method for measuring incremental speed of tape transport | Expired / Lapsed | 1969-09-17 | 1971-04-20 | 33 | Details |
| US3573743A | Programmable timing controls for magnetic memories | Expired / Lapsed | 1968-09-30 | 1971-04-06 | 18 | Details |
| US3568160A | Access control for plural magnetic memories | Expired / Lapsed | 1968-09-03 | 1971-03-02 | 11 | Details |
| US3566364A | Data processor having operator family controllers | Expired / Lapsed | 1968-07-19 | 1971-02-23 | 0 | Details |
| US3564509A | Data processing apparatus | Expired / Lapsed | 1968-04-22 | 1971-02-16 | 0 | Details |
| US3560935A | Interrupt apparatus for a modular data processing system | Expired / Lapsed | 1968-03-15 | 1971-02-02 | 0 | Details |
| US3559184A | Line adapter for data communication system | Expired / Lapsed | 1968-08-30 | 1971-01-26 | 0 | Details |
| US3555515A | Memory system having associative cells for marking locations | Expired / Lapsed | 1968-06-27 | 1971-01-12 | 0 | Details |
| US3555513A | Multiprocessor digital computer system with address modific… | Expired / Lapsed | 1967-10-11 | 1971-01-12 | 0 | Details |
| US3553659A | Biemitter transistor search memory array | Expired / Lapsed | 1968-12-11 | 1971-01-05 | 0 | Details |
| US3548384A | Procedure entry for a data processor employing a stack | Expired / Lapsed | 1967-10-02 | 1970-12-15 | 0 | Details |
| US3546686A | Random access system | Expired / Lapsed | 1969-09-22 | 1970-12-08 | 0 | Details |
| US3544971A | Device for automatically displaying the logic elements and … | Expired / Lapsed | 1968-02-21 | 1970-12-01 | 0 | Details |
| US3540012A | Crt display editing circuit | Expired / Lapsed | 1967-12-26 | 1970-11-10 | 0 | Details |
| US3539998A | Communications system and remote scanner and control units | Expired / Lapsed | 1967-07-12 | 1970-11-10 | 0 | Details |
| US3539244A | Electromagnetic radiation deflection apparatus employing el… | Expired / Lapsed | 1966-08-23 | 1970-11-10 | 0 | Details |
| US3537074A | Parallel operating array computer | Expired / Lapsed | 1967-12-20 | 1970-10-27 | 0 | Details |
| US3537075A | Data storage timing system | Expired / Lapsed | 1967-08-14 | 1970-10-27 | 0 | Details |
| US3537072A | Instruction conversion system and apparatus | Expired / Lapsed | 1967-06-19 | 1970-10-27 | 0 | Details |
| US3534339A | Service request priority resolver and encoder | Expired / Lapsed | 1967-08-24 | 1970-10-13 | 0 | Details |
| US3533083A | Dummy wire selection scheme for data processing equipment m… | Expired / Lapsed | 1968-01-30 | 1970-10-06 | 0 | Details |
| US3530438A | Task control | Expired / Lapsed | 1965-12-13 | 1970-09-22 | 0 | Details |
| US3528295A | Stylus with pressure responsive transducer | Expired / Lapsed | 1968-06-25 | 1970-09-15 | 0 | Details |
| US3528060A | Time variable stop bit scheme for data processing system | Expired / Lapsed | 1968-06-20 | 1970-09-08 | 0 | Details |
| US3516073A | Data and control character discrimination scheme for digita… | Expired / Lapsed | 1968-04-01 | 1970-06-02 | 0 | Details |
| US3514758A | Digital computer system having multi-line control unit | Expired / Lapsed | 1967-03-27 | 1970-05-26 | 0 | Details |
| US3512424A | Chain | Expired / Lapsed | 1968-06-06 | 1970-05-19 | 0 | Details |
| US3512133A | Digital data transmission system having means for automatic… | Expired / Lapsed | 1967-03-27 | 1970-05-12 | 0 | Details |
| US3510843A | Digital data transmission system having means for automatic… | Expired / Lapsed | 1967-03-27 | 1970-05-05 | 0 | Details |
| US3505650A | Visual character display device | Expired / Lapsed | 1967-01-17 | 1970-04-07 | 0 | Details |
| US3505665A | Display system | Expired / Lapsed | 1966-06-13 | 1970-04-07 | 0 | Details |
| US3498569A | Coaxial tape storage reel drive module | Expired / Lapsed | 1967-12-08 | 1970-03-03 | 0 | Details |
| US3497760A | Logical expansion circuitry for display systems | Expired / Lapsed | 1968-06-10 | 1970-02-24 | 0 | Details |
| US3495236A | Transducer | Expired / Lapsed | 1969-04-16 | 1970-02-10 | 0 | Details |
| US3488634A | Bidirectional distribution system | Expired / Lapsed | 1967-03-02 | 1970-01-06 | 0 | Details |
| US3487375A | Multi-program data processor | Expired / Lapsed | 1967-06-19 | 1969-12-30 | 0 | Details |
| US3483455A | Malfunction detection circuit | Expired / Lapsed | 1967-03-30 | 1969-12-09 | 0 | Details |
| US3483388A | Apparatus for generating signals indicative of the persiste… | Expired / Lapsed | 1964-09-02 | 1969-12-09 | 0 | Details |
| US3482184A | Laser device having multiple cavities that share a common a… | Expired / Lapsed | 1965-07-19 | 1969-12-02 | 0 | Details |
| US3476922A | Failure monitor for redundant channel systems | Expired / Lapsed | 1966-08-05 | 1969-11-04 | 0 | Details |
| US3471789A | Single pulse switch logic circuit | Expired / Lapsed | 1967-02-15 | 1969-10-07 | 0 | Details |
| US3466645A | Digital data crt display system | Expired / Lapsed | 1965-03-01 | 1969-09-09 | 0 | Details |
| US3463566A | Automatic article-handling system | Expired / Lapsed | 1967-10-16 | 1969-08-26 | 0 | Details |
| US3461434A | Stack mechanism having multiple display registers | Expired / Lapsed | 1967-10-02 | 1969-08-12 | 0 | Details |
| US3461433A | Relative addressing system for memories | Expired / Lapsed | 1967-01-27 | 1969-08-12 | 0 | Details |
| US3461432A | Bi-directional code converter | Expired / Lapsed | 1966-12-14 | 1969-08-12 | 0 | Details |
| US3458240A | Function generator for producing the possible boolean funct… | Expired / Lapsed | 1965-12-28 | 1969-07-29 | 0 | Details |
| US3454929A | Computer edit system | Expired / Lapsed | 1966-03-25 | 1969-07-08 | 0 | Details |
| US3446946A | Power-moment self-adaptive control system | Expired / Lapsed | 1964-12-01 | 1969-05-27 | 0 | Details |
| US3439218A | Control circuit for causing movement of a cathode ray tube … | Expired / Lapsed | 1966-09-30 | 1969-04-15 | 0 | Details |
| US3437998A | File control system | Expired / Lapsed | 1965-11-26 | 1969-04-08 | 0 | Details |
| US3436556A | Optical inspection system | Expired / Lapsed | 1966-03-24 | 1969-04-01 | 0 | Details |
| US3431475A | Solid state servo system including a unique d.c. control tr… | Expired / Lapsed | 1965-08-18 | 1969-03-04 | 0 | Details |
| US3430226A | Calculators | Expired / Lapsed | 1965-05-05 | 1969-02-25 | 0 | Details |
| US3426330A | Central data processor | Expired / Lapsed | 1966-02-14 | 1969-02-04 | 0 | Details |
| US3426323A | Error correction by retransmission | Expired / Lapsed | 1965-03-08 | 1969-02-04 | 0 | Details |
| US3422405A | Digital computer having an indirect field length operation | Expired / Lapsed | 1966-03-25 | 1969-01-14 | 0 | Details |
| US3421150A | Multiprocessor interrupt directory | Expired / Lapsed | 1966-08-26 | 1969-01-07 | 0 | Details |
| US3419852A | Input/output control system for electronic computers | Expired / Lapsed | 1966-02-14 | 1968-12-31 | 0 | Details |
| US3417378A | Multiple frequency data handling system | Expired / Lapsed | 1966-09-13 | 1968-12-17 | 2 | Details |
| US3417377A | Shift and buffer circuitry | Expired / Lapsed | 1966-09-13 | 1968-12-17 | 2 | Details |
| US3416139A | Interface control module for modular computer system and pl… | Expired / Lapsed | 1966-02-14 | 1968-12-10 | 0 | Details |
| US3412255A | Character recognition system using selectively positioned l… | Expired / Lapsed | 1964-12-22 | 1968-11-19 | 2 | Details |
| US3411139A | Modular multi-computing data processing system | Expired / Lapsed | 1965-11-26 | 1968-11-12 | 0 | Details |
| US3411093A | Frequency tracking circuits | Expired / Lapsed | 1965-09-02 | 1968-11-12 | 0 | Details |
| US3410979A | Method and apparatus for drilling holes by means of a focus… | Expired / Lapsed | 1964-05-28 | 1968-11-12 | 0 | Details |
| US3408632A | Input/output control for a digital computing system | Expired / Lapsed | 1966-06-03 | 1968-10-29 | 2 | Details |
| US3408630A | Digital computer having high speed branch operation | Expired / Lapsed | 1966-03-25 | 1968-10-29 | 0 | Details |
| US3407387A | On-line banking system | Expired / Lapsed | 1965-03-01 | 1968-10-22 | 0 | Details |
| US3405392A | Electronic calculators | Expired / Lapsed | 1965-04-30 | 1968-10-08 | 0 | Details |
| US3403386A | Format control | Expired / Lapsed | 1966-01-24 | 1968-09-24 | 0 | Details |
| US3401904A | Cross-channel monitoring for aircraft | Expired / Lapsed | 1967-01-03 | 1968-09-17 | 0 | Details |
| US3401268A | Optical correlator utilizing a plurality of axially aligned… | Expired / Lapsed | 1965-09-10 | 1968-09-10 | 0 | Details |
| US3400380A | Digital computer having an address controller operation | Expired / Lapsed | 1966-03-25 | 1968-09-03 | 2 | Details |
| US3399391A | Holding circuit for servo mechanism | Expired / Lapsed | 1964-06-10 | 1968-08-27 | 0 | Details |
| US3398405A | Digital computer with memory lock operation | Expired / Lapsed | 1965-06-07 | 1968-08-20 | 0 | Details |
| US3395353A | Pulse width discriminator | Expired / Lapsed | 1966-04-18 | 1968-07-30 | 2 | Details |
| US3390385A | Magnetic drum recording apparatus with replaceable sleeve | Expired / Lapsed | 1966-02-01 | 1968-06-25 | 2 | Details |
| US3390379A | Data communication system | Expired / Lapsed | 1965-07-26 | 1968-06-25 | 0 | Details |
| US3389380A | Signal responsive apparatus | Expired / Lapsed | 1965-10-05 | 1968-06-18 | 0 | Details |
| US3388465A | Electronic assembly soldering process | Expired / Lapsed | 1965-03-01 | 1968-06-18 | 0 | Details |
| US3386689A | Aircraft autopilot with control wheel steering | Expired / Lapsed | 1967-02-06 | 1968-06-04 | 0 | Details |
| US3387276A | Off-line memory test | Expired / Lapsed | 1965-08-13 | 1968-06-04 | 0 | Details |
| US3387274A | Memory apparatus and method | Expired / Lapsed | 1965-06-21 | 1968-06-04 | 0 | Details |
| US3380055A | Millimeter wave radiometer system for measuring air tempera… | Expired / Lapsed | 1966-01-07 | 1968-04-23 | 0 | Details |
| US3375507A | Information address recording and retrieval system | Expired / Lapsed | 1967-03-13 | 1968-03-26 | 0 | Details |
| US3371320A | Multipurpose matrix | Expired / Lapsed | 1965-03-12 | 1968-02-27 | 0 | Details |
| US3363234A | Data processing system | Expired / Lapsed | 1962-08-24 | 1968-01-09 | 2 | Details |
| US3360781A | Control circuit for a key punch or verifier | Expired / Lapsed | 1964-10-26 | 1967-12-26 | 2 | Details |
| US3359544A | Multiple program computer | Expired / Lapsed | 1965-08-09 | 1967-12-19 | 2 | Details |
| US3354321A | Matrix selection circuit with automatic discharge circuit | Expired / Lapsed | 1963-08-16 | 1967-11-21 | 1 | Details |
| US3354432A | Document reading system | Expired / Lapsed | 1962-02-23 | 1967-11-21 | 1 | Details |
| US3351917A | Information storage and retrieval system having a dynamic m… | Expired / Lapsed | 1965-02-05 | 1967-11-07 | 1 | Details |
| US3349255A | Delay multivibrator | Expired / Lapsed | 1965-04-20 | 1967-10-24 | 2 | Details |
| US3349390A | Nonlinear analog to digital converter | Expired / Lapsed | 1964-08-31 | 1967-10-24 | 2 | Details |
| US3346844A | Binary coded signal correlator | Expired / Lapsed | 1965-06-09 | 1967-10-10 | 2 | Details |
| US3344898A | Coin-operated dispensing system | Expired / Lapsed | 1966-01-03 | 1967-10-03 | 2 | Details |
| US3344401A | Inquiry system | Expired / Lapsed | 1963-03-15 | 1967-09-26 | 1 | Details |
| US3343132A | Data processing system | Expired / Lapsed | 1963-05-16 | 1967-09-19 | 2 | Details |
| US3341814A | Character recognition | Expired / Lapsed | 1962-07-11 | 1967-09-12 | 1 | Details |
| US3339203A | Windscreen type display apparatus | Expired / Lapsed | 1965-02-01 | 1967-08-29 | 1 | Details |
| US3339183A | Copy memory for a digital processor | Expired / Lapsed | 1964-11-16 | 1967-08-29 | 2 | Details |
| US3337851A | Memory organization for reducing access time of program rep… | Expired / Lapsed | 1963-12-09 | 1967-08-22 | 2 | Details |
| US3335369A | System for data communication by phase shift of square wave… | Expired / Lapsed | 1964-06-01 | 1967-08-08 | 2 | Details |
| US3334236A | Photo-optical light pen and amplifier | Expired / Lapsed | 1964-11-23 | 1967-08-01 | 2 | Details |
| US3333252A | Time-dependent priority system | Expired / Lapsed | 1965-01-18 | 1967-07-25 | 2 | Details |
| US3333244A | Analog signal responsive circuit for recognizing unknowns | Expired / Lapsed | 1964-11-06 | 1967-07-25 | 2 | Details |
| US3332069A | Search memory | Expired / Lapsed | 1964-07-09 | 1967-07-18 | 2 | Details |
| US3331055A | Data communication system with matrix selection of line ter… | Expired / Lapsed | 1964-06-01 | 1967-07-11 | 2 | Details |
| US3329881A | Power and control means for electrical appliances | Expired / Lapsed | 1964-07-27 | 1967-07-04 | 2 | Details |
| US3329947A | Electronic character generator | Expired / Lapsed | 1963-03-07 | 1967-07-04 | 1 | Details |
| US3328773A | Data processor set and indicate control systems | Expired / Lapsed | 1965-02-01 | 1967-06-27 | 2 | Details |
| US3328769A | Information sorting device | Expired / Lapsed | 1964-04-21 | 1967-06-27 | 2 | Details |
| US3323527A | Electronic coin counter | Expired / Lapsed | 1966-03-29 | 1967-06-06 | 2 | Details |
| US3320588A | Character reader | Expired / Lapsed | 1963-12-30 | 1967-05-16 | 1 | Details |
| US3320409A | Electronic plotting device | Expired / Lapsed | 1963-01-30 | 1967-05-16 | 2 | Details |
| US3319226A | Data processor module for a modular data processing system … | Expired / Lapsed | 1962-11-30 | 1967-05-09 | 1 | Details |
| US3315212A | Connector assembly | Expired / Lapsed | 1964-07-20 | 1967-04-18 | 2 | Details |
| US3312969A | Radar video processor and clutter eliminator | Expired / Lapsed | 1965-07-09 | 1967-04-04 | 2 | Details |
| US3311901A | Plated wire content addressed memory | Expired / Lapsed | 1963-12-30 | 1967-03-28 | 2 | Details |
| US3310660A | Asynchronous counting devices | Expired / Lapsed | 1963-04-23 | 1967-03-21 | 2 | Details |
| US3309602A | Current controllers | Expired / Lapsed | 1963-07-18 | 1967-03-14 | 2 | Details |
| US3305733A | Complementary symmetry differential pulse integrator | Expired / Lapsed | 1963-07-01 | 1967-02-21 | 2 | Details |
| US3305839A | Buffer system | Expired / Lapsed | 1963-03-22 | 1967-02-21 | 2 | Details |
| US3302183A | Micro-program digital computer | Expired / Lapsed | 1963-11-26 | 1967-01-31 | 2 | Details |
| US3302189A | Manually operable format control unit for the real-time ope… | Expired / Lapsed | 1962-07-02 | 1967-01-31 | 2 | Details |
| US3300017A | Electrosensitive printing apparatus with print head continu… | Expired / Lapsed | 1965-04-30 | 1967-01-24 | 2 | Details |
| US3298000A | Character correlation system | Expired / Lapsed | 1963-10-31 | 1967-01-10 | 2 | Details |
| US3297999A | Multi-programming computer | Expired / Lapsed | 1963-08-26 | 1967-01-10 | 2 | Details |
| US3293512A | Thin film, solid state amplifier with source and drain on o… | Expired / Lapsed | 1963-09-20 | 1966-12-20 | 1 | Details |
| US3291974A | Planar function generator using modulo 2 unprimed canonical… | Expired / Lapsed | 1964-12-14 | 1966-12-13 | 2 | Details |
| US3292155A | Computer branch command | Expired / Lapsed | 1963-03-15 | 1966-12-13 | 1 | Details |
| US3292153A | Memory system | Expired / Lapsed | 1962-10-01 | 1966-12-13 | 2 | Details |
| US3292152A | Memory | Expired / Lapsed | 1962-09-17 | 1966-12-13 | 2 | Details |
| US3290661A | Content addressable associative memory with an output compa… | Expired / Lapsed | 1962-11-19 | 1966-12-06 | 2 | Details |
| US3286239A | Automatic interrupt system for a data processor | Expired / Lapsed | 1962-11-30 | 1966-11-15 | 2 | Details |
| US3286236A | Electronic digital computer with automatic interrupt control | Expired / Lapsed | 1962-10-22 | 1966-11-15 | 1 | Details |
| US3283255A | Phase modulation system for reading particular information | Expired / Lapsed | 1962-07-05 | 1966-11-01 | 2 | Details |
| US3283303A | Synchronized and coded character recognition system | Expired / Lapsed | 1959-07-17 | 1966-11-01 | 1 | Details |
| US3281831A | Character generator apparatus including function generator … | Expired / Lapsed | 1964-07-02 | 1966-10-25 | 1 | Details |
| US3278906A | Dual channel mode | Expired / Lapsed | 1963-04-01 | 1966-10-11 | 2 | Details |
| US3277243A | Telephone adapter | Expired / Lapsed | 1962-12-19 | 1966-10-04 | 2 | Details |
| US3275989A | Control for digital computers | Expired / Lapsed | 1961-10-02 | 1966-09-27 | 2 | Details |
| US3274562A | Memory apparatus wherein the logical sum of address and dat… | Expired / Lapsed | 1963-01-30 | 1966-09-20 | 2 | Details |
| US3274561A | Data processor input/output control system | Expired / Lapsed | 1962-11-30 | 1966-09-20 | 0 | Details |
| US3272971A | Electronic count accumulator | Expired / Lapsed | 1963-02-05 | 1966-09-13 | 0 | Details |
| US3268713A | Electronic counters | Expired / Lapsed | 1963-03-25 | 1966-08-23 | 2 | Details |
| US3267293A | Character recognition circuit | Expired / Lapsed | 1963-04-25 | 1966-08-16 | 2 | Details |
| US3266022A | Computer addressing system | Expired / Lapsed | 1962-01-08 | 1966-08-09 | 2 | Details |
| US3266020A | Computer with error recovery | Expired / Lapsed | 1961-09-13 | 1966-08-09 | 2 | Details |
| US3264621A | Magnetic data store | Expired / Lapsed | 1963-03-25 | 1966-08-02 | 1 | Details |
| US3262210A | Control system | Expired / Lapsed | 1963-05-06 | 1966-07-26 | 2 | Details |
| US3263218A | Selective lockout of computer memory | Expired / Lapsed | 1962-06-22 | 1966-07-26 | 2 | Details |
| US3261003A | Tape error indication apparatus | Expired / Lapsed | 1962-06-20 | 1966-07-12 | 2 | Details |
| US3254329A | Computer cycling and control system | Expired / Lapsed | 1961-03-24 | 1966-05-31 | 2 | Details |
| US3253342A | Compensated compass system | Expired / Lapsed | 1961-01-25 | 1966-05-31 | 2 | Details |
| US3251042A | Digital computer | Expired / Lapsed | 1962-06-14 | 1966-05-10 | 2 | Details |
| US3251040A | Computer input-output system | Expired / Lapsed | 1961-12-01 | 1966-05-10 | 2 | Details |
| US3248650A | Cathode ray tube indicator for displaying plural input sign… | Expired / Lapsed | 1961-04-19 | 1966-04-26 | 2 | Details |
| US3247391A | Light gun with coaxially positioned elements | Expired / Lapsed | 1962-10-11 | 1966-04-19 | 1 | Details |
| US3247488A | Digital computing system | Expired / Lapsed | 1961-03-24 | 1966-04-19 | 1 | Details |
| US3246296A | Character reading apparatus | Expired / Lapsed | 1961-05-03 | 1966-04-12 | 2 | Details |
| US3242493A | Runway defining apparatus | Expired / Lapsed | 1962-11-29 | 1966-03-22 | 1 | Details |
| US3239820A | Digital computer with automatic repeating of program segmen… | Expired / Lapsed | 1962-02-16 | 1966-03-08 | 1 | Details |
| US3239816A | Computer indexing system | Expired / Lapsed | 1960-07-25 | 1966-03-08 | 2 | Details |
| US3236707A | Electrical circuitry and method | Expired / Lapsed | 1963-05-24 | 1966-02-22 | 2 | Details |
| US3237169A | Simultaneous read-write addressing | Expired / Lapsed | 1962-06-13 | 1966-02-22 | 2 | Details |
| US3237012A | Photosensitive digitally encoded indicator for use with mec… | Expired / Lapsed | 1962-05-21 | 1966-02-22 | 1 | Details |
| US3234044A | Use of an electron beam for manufacturing conductive patter… | Expired / Lapsed | 1962-09-25 | 1966-02-08 | 2 | Details |
| US3233224A | Data processing system | Expired / Lapsed | 1960-09-15 | 1966-02-01 | 2 | Details |
| US3229626A | High speed printer in electronic computer system | Expired / Lapsed | 1963-04-25 | 1966-01-18 | 2 | Details |
| US3226694A | Interrupt system | Expired / Lapsed | 1962-07-03 | 1965-12-28 | 2 | Details |
| US3226693A | Information reversing method and apparatus | Expired / Lapsed | 1962-05-10 | 1965-12-28 | 2 | Details |
| US3222649A | Digital computer with indirect addressing | Expired / Lapsed | 1961-02-13 | 1965-12-07 | 2 | Details |
| US3218478A | Signal responsive apparatus | Expired / Lapsed | 1963-02-28 | 1965-11-16 | 2 | Details |
| US3216676A | Self-adaptive control system | Expired / Lapsed | 1963-05-20 | 1965-11-09 | 2 | Details |
| US3214739A | Duplex operation of peripheral equipment | Expired / Lapsed | 1962-08-23 | 1965-10-26 | 2 | Details |
| US3214575A | Celestial-inertial navigation system | Expired / Lapsed | 1961-09-14 | 1965-10-26 | 3 | Details |
| US3214738A | Transformer diode shift matrix | Expired / Lapsed | 1961-06-19 | 1965-10-26 | 2 | Details |
| US3214659A | Constant speed control system | Expired / Lapsed | 1952-02-05 | 1965-10-26 | 2 | Details |
| US3212064A | Matrix having thin magnetic film logical gates for transfer… | Expired / Lapsed | 1961-11-27 | 1965-10-12 | 2 | Details |
| US3209268A | Phase modulation read out circuit | Expired / Lapsed | 1962-01-15 | 1965-09-28 | 2 | Details |
| US3209338A | Zero detector for a positioning system | Expired / Lapsed | 1960-08-26 | 1965-09-28 | 1 | Details |
| US3202180A | Fluid pulse generator | Expired / Lapsed | 1963-02-08 | 1965-08-24 | 1 | Details |
| US3202828A | Use of polarizing materials to overcome light leakage | Expired / Lapsed | 1962-07-02 | 1965-08-24 | 2 | Details |
| US3201761A | Indirect addressing system | Expired / Lapsed | 1961-08-17 | 1965-08-17 | 2 | Details |
| US3200361A | Printed circuit board connector assembly | Expired / Lapsed | 1962-07-20 | 1965-08-10 | 1 | Details |
| US3200380A | Data processing system | Expired / Lapsed | 1961-02-16 | 1965-08-10 | 2 | Details |
| US3197773A | Frequency modulated continuous wave navigation radar | Expired / Lapsed | 1962-04-19 | 1965-07-27 | 2 | Details |
| US3192892A | Ion bombardment cleaning and coating apparatus | Expired / Lapsed | 1961-11-24 | 1965-07-06 | 2 | Details |
| US3193669A | Floating point arithmetic circuit | Expired / Lapsed | 1961-04-26 | 1965-07-06 | 1 | Details |
| US3193808A | Digital shift circuit | Expired / Lapsed | 1960-10-13 | 1965-07-06 | 2 | Details |
| US3191611A | "and" gate | Expired / Lapsed | 1963-01-25 | 1965-06-29 | 2 | Details |
| US3191064A | High speed switching circuit | Expired / Lapsed | 1962-08-22 | 1965-06-22 | 1 | Details |
| US3187426A | Method of making printed circuit assemblies | Expired / Lapsed | 1962-03-19 | 1965-06-08 | 2 | Details |
| US3187327A | Multiplex beacon range determining system | Expired / Lapsed | 1959-12-14 | 1965-06-01 | 2 | Details |
| US3183483A | Error detection apparatus | Expired / Lapsed | 1961-01-16 | 1965-05-11 | 2 | Details |
| US3177469A | Character recognition | Expired / Lapsed | 1959-08-31 | 1965-04-06 | 2 | Details |
| US3175569A | Pure fluid pulse generator | Expired / Lapsed | 1961-12-28 | 1965-03-30 | 2 | Details |
| US3171039A | Flip-flop circuit | Expired / Lapsed | 1960-12-23 | 1965-02-23 | 2 | Details |
| US3171104A | Variable reluctance binary data transducer | Expired / Lapsed | 1959-10-13 | 1965-02-23 | 2 | Details |
| US3170156A | Gain monitoring system for a heightfinding radar | Expired / Lapsed | 1955-12-02 | 1965-02-16 | 2 | Details |
| US3168724A | Computing device incorporating interruptible repeat instruc… | Expired / Lapsed | 1962-01-22 | 1965-02-02 | 1 | Details |
| US3163859A | Code conversion device | Expired / Lapsed | 1962-03-21 | 1964-12-29 | 1 | Details |
| US3163748A | Data checking apparatus | Expired / Lapsed | 1961-11-21 | 1964-12-29 | 2 | Details |
| US3161763A | Electronic digital computer with word field selection | Expired / Lapsed | 1959-01-26 | 1964-12-15 | 2 | Details |
| US3160875A | Magnetic encoder | Expired / Lapsed | 1962-08-01 | 1964-12-08 | 2 | Details |
| US3159793A | Phase modulation reading system employing controlled gating… | Expired / Lapsed | 1963-01-23 | 1964-12-01 | 2 | Details |
| US3159821A | Magnetic core matrix | Expired / Lapsed | 1957-09-25 | 1964-12-01 | 1 | Details |
| US3155939A | Counter checking circuit | Expired / Lapsed | 1960-10-31 | 1964-11-03 | 1 | Details |
| US3153225A | Data processor with improved subroutine control | Expired / Lapsed | 1961-04-10 | 1964-10-13 | 1 | Details |
| US3151256A | Schmitt trigger having negative set and reset voltage level… | Expired / Lapsed | 1961-08-18 | 1964-09-29 | 2 | Details |
| US3151248A | Photosensitive light gun | Expired / Lapsed | 1960-12-19 | 1964-09-29 | 2 | Details |
| US3151317A | Magnetic stepping circuit | Expired / Lapsed | 1960-10-10 | 1964-09-29 | 2 | Details |
| US3147474A | Information transformation system | Expired / Lapsed | 1962-01-23 | 1964-09-01 | 2 | Details |
| US3143644A | Control apparatus for digital computers | Expired / Lapsed | 1954-09-09 | 1964-08-04 | 2 | Details |
| US3141151A | Magnetic tape storage system for digital computers wherein … | Expired / Lapsed | 1959-03-23 | 1964-07-14 | 2 | Details |
| US3139521A | Locating data in a magnetic recording system | Expired / Lapsed | 1961-05-05 | 1964-06-30 | 2 | Details |
| US3139531A | Magnetic shift circuits | Expired / Lapsed | 1960-10-11 | 1964-06-30 | 2 | Details |
| US3133520A | Automatic turn control system | Expired / Lapsed | 1962-04-17 | 1964-05-19 | 2 | Details |
| US3131343A | Control systems whereby the d.c. output voltage can be cont… | Expired / Lapsed | 1961-07-24 | 1964-04-28 | 2 | Details |
| US3130388A | Non-destructive sensing memory | Expired / Lapsed | 1960-05-02 | 1964-04-21 | 1 | Details |
| US3122726A | Recirculating binary data rate converter | Expired / Lapsed | 1958-01-02 | 1964-02-25 | 1 | Details |
| US3120606A | Electronic numerical integrator and computer | Expired / Lapsed | 1947-06-26 | 1964-02-04 | 2 | Details |
| US3119950A | Counter circuit with diode matrix feeding signals to transi… | Expired / Lapsed | 1962-03-22 | 1964-01-28 | 1 | Details |
| US3117280A | Timing signal receiver | Expired / Lapsed | 1962-04-17 | 1964-01-07 | 2 | Details |
| US3117317A | Distance measuring circuit | Expired / Lapsed | 1959-05-25 | 1964-01-07 | 1 | Details |
| US3114841A | Photo electric card reading system | Expired / Lapsed | 1961-06-02 | 1963-12-17 | 2 | Details |
| US3111647A | Character reading system | Expired / Lapsed | 1960-06-21 | 1963-11-19 | 1 | Details |
| US3109988A | Electromagnetic radiation monitor utilizing means responsiv… | Expired / Lapsed | 1961-08-04 | 1963-11-05 | 2 | Details |
| US3108647A | Self-correcting weighing machine and method | Expired / Lapsed | 1961-10-31 | 1963-10-29 | 2 | Details |
| US3107514A | Aircraft heading alignment apparatus and method | Expired / Lapsed | 1961-12-26 | 1963-10-22 | 4 | Details |
| US3105224A | Switching circuit in a matrix arrangement utilizing transis… | Expired / Lapsed | 1957-08-06 | 1963-09-24 | 2 | Details |
| US3103646A | Voltage comparison circuit | Expired / Lapsed | 1959-01-29 | 1963-09-10 | 2 | Details |
| US3103617A | Voltage regulation with temperature compensation | Expired / Lapsed | 1958-05-06 | 1963-09-10 | 2 | Details |
| US3099795A | Phase coded communication system | Expired / Lapsed | 1957-04-03 | 1963-07-30 | 2 | Details |
| US3094696A | Phase coder alignment system | Expired / Lapsed | 1957-04-24 | 1963-06-18 | 2 | Details |
| US3092812A | Non-destructive sensing of thin film magnetic cores | Expired / Lapsed | 1957-05-10 | 1963-06-04 | 2 | Details |
| US3090944A | Timing pulse generator | Expired / Lapsed | 1958-09-12 | 1963-05-21 | 2 | Details |
| US3090953A | Pulse burst compression radar | Expired / Lapsed | 1956-09-27 | 1963-05-21 | 2 | Details |
| US3087030A | Magnetically controlled commutator devices | Expired / Lapsed | 1960-06-03 | 1963-04-23 | 2 | Details |
| US3087026A | Boundary displacement magnetic recording apparatus | Expired / Lapsed | 1952-09-17 | 1963-04-23 | 1 | Details |
| US3080555A | Function generator | Expired / Lapsed | 1958-06-12 | 1963-03-05 | 4 | Details |
| US3077557A | Flight path computer | Expired / Lapsed | 1960-09-30 | 1963-02-12 | 1 | Details |
| US3077110A | System for monitoring the take-off performance of an aircra… | Expired / Lapsed | 1959-06-29 | 1963-02-12 | 2 | Details |
| US3076958A | Memory search apparatus | Expired / Lapsed | 1959-11-24 | 1963-02-05 | 1 | Details |
| US3076393A | Electrostatic page printer | Expired / Lapsed | 1959-05-18 | 1963-02-05 | 2 | Details |
| US3074033A | Microwave frequency separator | Expired / Lapsed | 1957-02-26 | 1963-01-15 | 2 | Details |
| FR1313414A | Method for measuring and compensating for deviation errors … | Expired / Lapsed | 1962-01-16 | 1962-12-28 | 0 | Details |
| US3070333A | Aircraft altitude control system | Expired / Lapsed | 1961-01-06 | 1962-12-25 | 0 | Details |
| US3068367A | Pulse train gap detector circuitry | Expired / Lapsed | 1959-09-08 | 1962-12-11 | 0 | Details |
| US3064242A | Magnetic record sensing apparatus | Expired / Lapsed | 1957-04-11 | 1962-11-13 | 0 | Details |
| US3053449A | Electronic computer system | Expired / Lapsed | 1955-03-04 | 1962-09-11 | 0 | Details |
| US3052129A | Gyroscopic reference system | Expired / Lapsed | 1960-10-13 | 1962-09-04 | 0 | Details |
| US3051852A | Transistorized circuit breaker network | Expired / Lapsed | 1958-11-19 | 1962-08-28 | 0 | Details |
| US3050714A | Shift register | Expired / Lapsed | 1959-06-19 | 1962-08-21 | 0 | Details |
| US3050717A | Computer shift control circuits | Expired / Lapsed | 1956-08-07 | 1962-08-21 | 0 | Details |
| US3049294A | Velocity and distance indicating system | Expired / Lapsed | 1957-01-23 | 1962-08-14 | 0 | Details |
| US3039080A | Encoding device | Expired / Lapsed | 1956-07-27 | 1962-06-12 | 0 | Details |
| US3038088A | Transistor switch having compensating means for thermal eff… | Expired / Lapsed | 1959-03-13 | 1962-06-05 | 0 | Details |
| US3037289A | Directional reference correction system | Expired / Lapsed | 1953-07-07 | 1962-06-05 | 0 | Details |
| US3033994A | Resettable delay flop having blocking oscillator whose cond… | Expired / Lapsed | 1960-05-13 | 1962-05-08 | 0 | Details |
| US3033035A | Compound aircraft instrument | Expired / Lapsed | 1956-08-10 | 1962-05-08 | 0 | Details |
| US3030612A | Magnetic apparatus and methods | Expired / Lapsed | 1956-12-07 | 1962-04-17 | 0 | Details |
| US3026029A | Data processing code card | Expired / Lapsed | 1958-04-30 | 1962-03-20 | 0 | Details |
| US3021067A | Time-sharing computer | Expired / Lapsed | 1957-01-14 | 1962-02-13 | 0 | Details |
| US3016534A | Dual function antenna | Expired / Lapsed | 1960-07-01 | 1962-01-09 | 0 | Details |
| US3014660A | Address selection means | Expired / Lapsed | 1956-10-01 | 1961-12-26 | 0 | Details |
| US3012232A | High speed printer | Expired / Lapsed | 1953-01-27 | 1961-12-05 | 0 | Details |
| US3009070A | Bi-directional current driver | Expired / Lapsed | 1958-12-30 | 1961-11-14 | 0 | Details |
| US3008077A | Adaptive autopilot servo system | Expired / Lapsed | 1960-01-06 | 1961-11-07 | 0 | Details |
| US3008075A | Phase stabilizing circuit | Expired / Lapsed | 1959-05-04 | 1961-11-07 | 0 | Details |
| US3008055A | Bistable circuits having unidirectional feedback means | Expired / Lapsed | 1955-03-29 | 1961-11-07 | 0 | Details |
| US3004251A | Digital-to-analogue converter | Expired / Lapsed | 1957-10-10 | 1961-10-10 | 0 | Details |
| US3001708A | Central control circuit for computers | Expired / Lapsed | 1959-01-26 | 1961-09-26 | 0 | Details |
| US3000555A | Digital computer input | Expired / Lapsed | 1955-03-04 | 1961-09-19 | 0 | Details |
| US2999968A | Switching circuit for nonlinear servo integral compensation | Expired / Lapsed | 1959-10-19 | 1961-09-12 | 0 | Details |
| US2997233A | Combined shift register and counter circuit | Expired / Lapsed | 1954-06-28 | 1961-08-22 | 0 | Details |
| US2995302A | Reversible digital resolver | Expired / Lapsed | 1958-07-21 | 1961-08-08 | 0 | Details |
| US2995631A | Magnetic reading device | Expired / Lapsed | 1951-10-25 | 1961-08-08 | 0 | Details |
| US2992416A | Pulse control system | Expired / Lapsed | 1957-01-09 | 1961-07-11 | 0 | Details |
| US2992409A | Transistor selection array and drive system | Expired / Lapsed | 1955-08-09 | 1961-07-11 | 0 | Details |
| US2991464A | Azimuth target gating system | Expired / Lapsed | 1958-10-07 | 1961-07-04 | 0 | Details |
| US2991414A | Electrical apparatus | Expired / Lapsed | 1957-09-26 | 1961-07-04 | 0 | Details |
| US2991452A | Pulse group synchronizers | Expired / Lapsed | 1956-03-02 | 1961-07-04 | 0 | Details |
| US2990310A | Laminated printed circuit board | Expired / Lapsed | 1960-05-11 | 1961-06-27 | 2 | Details |
| US2989729A | Keyboard checking apparatus | Expired / Lapsed | 1958-12-10 | 1961-06-20 | 0 | Details |
| US2986966A | Stabilized optical system | Expired / Lapsed | 1958-12-15 | 1961-06-06 | 0 | Details |
| US2987629A | Voltage comparator | Expired / Lapsed | 1957-07-10 | 1961-06-06 | 0 | Details |
| US2987050A | Compensated flow control valve | Expired / Lapsed | 1957-04-29 | 1961-06-06 | 0 | Details |
| US2981853A | Reference pulse generation | Expired / Lapsed | 1959-12-04 | 1961-04-25 | 0 | Details |
| US2981941A | Selective optical screen and system | Expired / Lapsed | 1956-08-22 | 1961-04-25 | 0 | Details |
| US2981140A | Multiple image display system | Expired / Lapsed | 1956-04-24 | 1961-04-25 | 0 | Details |
| US2973927A | Monitoring device for automatic pilot systems | Expired / Lapsed | 1956-11-21 | 1961-03-07 | 0 | Details |
| US2973438A | Ring counter | Expired / Lapsed | 1956-12-20 | 1961-02-28 | 0 | Details |
| US2972128A | Phase modulated pulse recording systems | Expired / Lapsed | 1956-07-30 | 1961-02-14 | 0 | Details |
| US2972127A | Error responsive system | Expired / Lapsed | 1954-12-27 | 1961-02-14 | 0 | Details |
| US2970763A | Predetermined pulse selector | Expired / Lapsed | 1957-02-28 | 1961-02-07 | 0 | Details |
| US2969525A | Locating information | Expired / Lapsed | 1954-05-20 | 1961-01-24 | 0 | Details |
| US2968997A | Cross connected servo mechanism for a turret gun directing … | Expired / Lapsed | 1947-05-09 | 1961-01-24 | 0 | Details |
| US2968803A | Fixed-periodicity monitoring and control system | Expired / Lapsed | 1957-01-31 | 1961-01-17 | 0 | Details |
| US2966591A | Object detection and tracking system | Expired / Lapsed | 1956-05-09 | 1960-12-27 | 0 | Details |
| US2966597A | Transistor amplifier and pulse shaper | Expired / Lapsed | 1955-07-28 | 1960-12-27 | 0 | Details |
| US2962698A | Visual indicator system | Expired / Lapsed | 1958-05-23 | 1960-11-29 | 0 | Details |
| US2961535A | Automatic delay compensation | Expired / Lapsed | 1957-11-27 | 1960-11-22 | 0 | Details |
| US2960681A | Transistor function tables | Expired / Lapsed | 1955-08-05 | 1960-11-15 | 0 | Details |
| US2960684A | Magnetic counter | Expired / Lapsed | 1952-12-03 | 1960-11-15 | 0 | Details |
| US2959687A | Switching devices | Expired / Lapsed | 1956-09-21 | 1960-11-08 | 0 | Details |
| US2956745A | Subtract counter | Expired / Lapsed | 1958-09-29 | 1960-10-18 | 0 | Details |
| US2954731A | Electronically controlled high speed printer | Expired / Lapsed | 1958-09-17 | 1960-10-04 | 0 | Details |
| US2952846A | Missile velocity indicating system | Expired / Lapsed | 1957-04-17 | 1960-09-13 | 0 | Details |
| US2948494A | Control systems for dirigible craft | Expired / Lapsed | 1954-01-13 | 1960-08-09 | 0 | Details |
| US2947982A | Servo drive system with dynamic error elimination | Expired / Lapsed | 1955-08-16 | 1960-08-02 | 0 | Details |
| US2947945A | Time domain filter | Expired / Lapsed | 1954-11-05 | 1960-08-02 | 0 | Details |
| US2943303A | Visual indicating signal monitoring system | Expired / Lapsed | 1955-08-01 | 1960-06-28 | 0 | Details |
| US2938193A | Code generator | Expired / Lapsed | 1955-06-10 | 1960-05-24 | 0 | Details |
| US2937366A | Pulse group synchronizer | Expired / Lapsed | 1956-02-06 | 1960-05-17 | 0 | Details |
| US2936627A | Vertical and velocity reference defining system | Expired / Lapsed | 1956-01-03 | 1960-05-17 | 0 | Details |
| US2936134A | Longitudinal axis control system for aircraft | Expired / Lapsed | 1956-03-15 | 1960-05-10 | 0 | Details |
| US2935739A | Multi-aperture core storage circuit | Expired / Lapsed | 1958-06-12 | 1960-05-03 | 0 | Details |
| US2935609A | Pre-trigger generator | Expired / Lapsed | 1957-08-21 | 1960-05-03 | 0 | Details |
| US2933252A | Binary adder-subtracter with command carry control | Expired / Lapsed | 1956-12-19 | 1960-04-19 | 0 | Details |
| US2932816A | Keyboard transmitter | Expired / Lapsed | 1958-05-19 | 1960-04-12 | 0 | Details |
| US2928080A | Static memory system | Expired / Lapsed | 1958-07-16 | 1960-03-08 | 0 | Details |
| US2927733A | Gating circuits | Expired / Lapsed | 1958-02-20 | 1960-03-08 | 0 | Details |
| US2927216A | Photometric character recognition device | Expired / Lapsed | 1957-12-19 | 1960-03-01 | 0 | Details |
| US2927223A | Temperature compensated limiter circuits | Expired / Lapsed | 1957-11-27 | 1960-03-01 | 0 | Details |
| US2924977A | Rotor dynamic unbalance analyzing system | Expired / Lapsed | 1955-08-31 | 1960-02-16 | 0 | Details |
| US2923833A | Selection system | Expired / Lapsed | 1955-04-26 | 1960-02-02 | 0 | Details |
| US2921190A | Serial coincidence detector | Expired / Lapsed | 1954-08-23 | 1960-01-12 | 0 | Details |
| US2919171A | Page printing apparatus | Expired / Lapsed | 1957-02-27 | 1959-12-29 | 0 | Details |
| US2918658A | Format control for high speed printers | Expired / Lapsed | 1956-02-28 | 1959-12-22 | 0 | Details |
| US2915967A | Information reproducing system | Expired / Lapsed | 1958-08-06 | 1959-12-08 | 0 | Details |
| US2915966A | High speed printer | Expired / Lapsed | 1955-06-13 | 1959-12-08 | 0 | Details |
| US2916210A | Apparatus for selectively modifying program information | Expired / Lapsed | 1954-07-30 | 1959-12-08 | 0 | Details |
| US2914752A | Information storage system | Expired / Lapsed | 1955-05-09 | 1959-11-24 | 0 | Details |
| US2912637A | Electronic voltage regulator | Expired / Lapsed | 1957-09-30 | 1959-11-10 | 0 | Details |
| US2911085A | Wire printer with oscillatory print head | Expired / Lapsed | 1957-07-01 | 1959-11-03 | 0 | Details |
| US2910238A | Inventory digital storage and computation apparatus | Expired / Lapsed | 1951-11-13 | 1959-10-27 | 0 | Details |
| US2907524A | Conditional stop control apparatus | Expired / Lapsed | 1954-06-01 | 1959-10-06 | 0 | Details |
| US2907000A | Double base diode memory | Expired / Lapsed | 1955-08-05 | 1959-09-29 | 0 | Details |
| US2907006A | Shifting register with inductive intermediate storage | Expired / Lapsed | 1955-01-21 | 1959-09-29 | 0 | Details |
| US2904683A | Phase demodulation | Expired / Lapsed | 1956-10-23 | 1959-09-15 | 0 | Details |
| US2901735A | Magnetic amplifier drive for coincident current switch | Expired / Lapsed | 1955-04-29 | 1959-08-25 | 0 | Details |
| US2900282A | Method of treating magnetic material and resulting articles | Expired / Lapsed | 1956-07-20 | 1959-08-18 | 2 | Details |
| US2900506A | Phase detector | Expired / Lapsed | 1955-05-13 | 1959-08-18 | 0 | Details |
| US2898576A | Character recognition apparatus | Expired / Lapsed | 1953-12-04 | 1959-08-04 | 0 | Details |
| US2896848A | Magnetic core shift register counter | Expired / Lapsed | 1954-10-08 | 1959-07-28 | 0 | Details |
| US2896145A | Flight path angle control systems | Expired / Lapsed | 1956-03-13 | 1959-07-21 | 0 | Details |
| US2894247A | Character recognition device | Expired / Lapsed | 1953-12-04 | 1959-07-07 | 0 | Details |
| US2892948A | Positional control system for photoscanner | Expired / Lapsed | 1956-04-10 | 1959-06-30 | 0 | Details |
| US2892099A | Semi-conductor adder | Expired / Lapsed | 1953-12-31 | 1959-06-23 | 0 | Details |
| US2890829A | Logical binary powering circuits | Expired / Lapsed | 1956-10-08 | 1959-06-16 | 0 | Details |
| US2889468A | Binary-coded decade counter | Expired / Lapsed | 1955-03-14 | 1959-06-02 | 0 | Details |
| US2889491A | Tape storage bin | Expired / Lapsed | 1954-10-22 | 1959-06-02 | 0 | Details |
| US2887872A | Method of measuring and compensating for deviation errors f… | Expired / Lapsed | 1956-02-23 | 1959-05-26 | 0 | Details |
| US2887873A | Method of measuring and compensating for deviation errors i… | Expired / Lapsed | 1956-02-23 | 1959-05-26 | 0 | Details |
| US2886705A | Wideband microwave discriminator | Expired / Lapsed | 1958-02-25 | 1959-05-12 | 0 | Details |
| US2885232A | Coupling | Expired / Lapsed | 1958-02-05 | 1959-05-05 | 0 | Details |
| US2884615A | Pulse coded signal separator | Expired / Lapsed | 1957-02-12 | 1959-04-28 | 0 | Details |
| US2882525A | Unusual indicator presentation system | Expired / Lapsed | 1955-09-22 | 1959-04-14 | 0 | Details |
| US2881412A | Shift registers | Expired / Lapsed | 1954-04-29 | 1959-04-07 | 0 | Details |
| US2881423A | Pilot pulse system for monopulse comparator | Expired / Lapsed | 1953-07-10 | 1959-04-07 | 0 | Details |
| US2878435A | Servosystem with low impedance stabilization network | Expired / Lapsed | 1956-10-19 | 1959-03-17 | 0 | Details |
| US2877451A | Diode switching circuits | Expired / Lapsed | 1955-05-12 | 1959-03-10 | 0 | Details |
| FR1174118A | Transistor rocker circuit | Expired / Lapsed | 1957-04-04 | 1959-03-06 | 0 | Details |
| US2876350A | Coding system | Expired / Lapsed | 1955-05-26 | 1959-03-03 | 0 | Details |
| US2876058A | Magnetic recording system | Expired / Lapsed | 1953-05-15 | 1959-03-03 | 0 | Details |
| US2875412A | Pulse width modulator | Expired / Lapsed | 1956-11-20 | 1959-02-24 | 0 | Details |
| US2873074A | Flight control system | Expired / Lapsed | 1953-10-09 | 1959-02-10 | 0 | Details |
| US2869684A | Tape feeding system | Expired / Lapsed | 1954-08-05 | 1959-01-20 | 0 | Details |
| US2869322A | Fuel control system for gas turbine engines under steady-st… | Expired / Lapsed | 1954-02-18 | 1959-01-20 | 0 | Details |
| US2869063A | Control systems for dirigible craft | Expired / Lapsed | 1954-06-10 | 1959-01-13 | 0 | Details |
| US2864965A | Electron gun for tubular beam | Expired / Lapsed | 1956-04-05 | 1958-12-16 | 0 | Details |
| US2863138A | Two-way shift register | Expired / Lapsed | 1957-03-05 | 1958-12-02 | 0 | Details |
| US2862664A | Electrical keyboard | Expired / Lapsed | 1955-10-31 | 1958-12-02 | 0 | Details |
| US2862199A | Magnetic drum storage system | Expired / Lapsed | 1955-05-24 | 1958-11-25 | 0 | Details |
| US2862167A | Autopilot servomotor systems | Expired / Lapsed | 1953-12-08 | 1958-11-25 | 0 | Details |
| US2857100A | Error detection system | Expired / Lapsed | 1957-03-05 | 1958-10-21 | 0 | Details |
| US2856595A | Control apparatus for digital computing machinery | Expired / Lapsed | 1954-06-09 | 1958-10-14 | 0 | Details |
| US2848605A | Analogue-to-digital conversion using cathode ray sampler to… | Expired / Lapsed | 1954-01-22 | 1958-08-19 | 0 | Details |
| US2846666A | Magnetostrictive pulse delay apparatus | Expired / Lapsed | 1956-04-11 | 1958-08-05 | 0 | Details |
| US2846671A | Magnetic matrix | Expired / Lapsed | 1955-06-29 | 1958-08-05 | 0 | Details |
| US2844812A | Variable matrix for performing arithmetic and logical funct… | Expired / Lapsed | 1952-12-04 | 1958-07-22 | 0 | Details |
| US2842761A | Moving target indicator radar system | Expired / Lapsed | 1953-01-12 | 1958-07-08 | 0 | Details |
| US2841345A | Glide path system with flare out | Expired / Lapsed | 1952-01-15 | 1958-07-01 | 0 | Details |
| US2840366A | Accelerometers | Expired / Lapsed | 1952-11-25 | 1958-06-24 | 0 | Details |
| FR1157320A | Transistor control circuits | Expired / Lapsed | 1956-07-05 | 1958-05-28 | 0 | Details |
| US2835888A | Multiple pulsed navigation system | Expired / Lapsed | 1956-09-27 | 1958-05-20 | 0 | Details |
| US2835882A | Magnetizable record reading system | Expired / Lapsed | 1955-01-27 | 1958-05-20 | 0 | Details |
| US2834894A | Asymmetrically energized magnetic amplifiers | Expired / Lapsed | 1956-06-05 | 1958-05-13 | 0 | Details |
| US2834883A | Peak amplitude indicator | Expired / Lapsed | 1955-10-12 | 1958-05-13 | 0 | Details |
| US2834007A | Shifting register or array | Expired / Lapsed | 1954-10-07 | 1958-05-06 | 0 | Details |
| US2832887A | Compensated charge storage circuit | Expired / Lapsed | 1955-11-04 | 1958-04-29 | 0 | Details |
| US2831424A | Traveling type carriage in high speed printers | Expired / Lapsed | 1954-03-01 | 1958-04-22 | 0 | Details |
| US2832062A | Magnetic device | Expired / Lapsed | 1952-11-13 | 1958-04-22 | 0 | Details |
| US2830291A | Flare-out control | Expired / Lapsed | 1954-09-23 | 1958-04-08 | 0 | Details |
| US2828482A | Conversion systems | Expired / Lapsed | 1956-05-15 | 1958-03-25 | 0 | Details |
| US2824961A | Decade counter for producing an output at the count of nine | Expired / Lapsed | 1955-03-04 | 1958-02-25 | 0 | Details |
| US2823877A | Control systems for dirigible craft | Expired / Lapsed | 1954-06-10 | 1958-02-18 | 0 | Details |
| US2823321A | Gate and buffer circuits | Expired / Lapsed | 1955-05-03 | 1958-02-11 | 0 | Details |
| US2823378A | Aircraft navigation instrument | Expired / Lapsed | 1954-04-07 | 1958-02-11 | 0 | Details |
| US2819395A | Driving circuits for static magnetic elements | Expired / Lapsed | 1954-05-24 | 1958-01-07 | 0 | Details |
| US2819453A | Microwave frequency meter | Expired / Lapsed | 1954-03-10 | 1958-01-07 | 0 | Details |
| US2815169A | Secant solver | Expired / Lapsed | 1952-04-23 | 1957-12-03 | 0 | Details |
| US2814793A | Variable delay line | Expired / Lapsed | 1955-04-05 | 1957-11-26 | 0 | Details |
| US2812509A | Private line system | Expired / Lapsed | 1953-08-31 | 1957-11-05 | 0 | Details |
| US2808999A | Automatic flight control apparatus | Expired / Lapsed | 1949-05-07 | 1957-10-08 | 0 | Details |
| US2807003A | Timing signal generation | Expired / Lapsed | 1955-04-14 | 1957-09-17 | 0 | Details |
| US2805409A | Magnetic core devices | Expired / Lapsed | 1955-09-14 | 1957-09-03 | 0 | Details |
| US2805020A | Binary arithmetic computer circuit | Expired / Lapsed | 1955-09-06 | 1957-09-03 | 0 | Details |
| US2801059A | Radio controlled craft guidance system | Expired / Lapsed | 1954-08-02 | 1957-07-30 | 0 | Details |
| US2798156A | Digit pulse counter | Expired / Lapsed | 1953-12-17 | 1957-07-02 | 0 | Details |
| US2795736A | Automatic headlight dimmer | Expired / Lapsed | 1953-11-04 | 1957-06-11 | 0 | Details |
| US2795757A | Toroidal ferromagnetic core testing | Expired / Lapsed | 1953-05-15 | 1957-06-11 | 0 | Details |
| US2788879A | Information recording apparatus | Expired / Lapsed | 1955-10-04 | 1957-04-16 | 0 | Details |
| US2787760A | Automotive engine analyzer | Expired / Lapsed | 1952-12-19 | 1957-04-02 | 0 | Details |
| US2781446A | Pulse cycling circuit | Expired / Lapsed | 1952-03-28 | 1957-02-12 | 0 | Details |
| US2778933A | Amplitude modulation detector which is phase responsive | Expired / Lapsed | 1951-08-25 | 1957-01-22 | 0 | Details |
| US2771595A | Data storage system | Expired / Lapsed | 1950-12-30 | 1956-11-20 | 0 | Details |
| US2762123A | Navigation system | Expired / Lapsed | 1948-05-26 | 1956-09-11 | 0 | Details |
| US2755381A | Delay line trigger circuit | Expired / Lapsed | 1952-04-18 | 1956-07-17 | 0 | Details |
| US2755383A | Frequency control circuits | Expired / Lapsed | 1951-06-29 | 1956-07-17 | 0 | Details |
| US2753545A | Two element per bit shift registers requiring a single adva… | Expired / Lapsed | 1954-10-08 | 1956-07-03 | 0 | Details |
| US2752593A | Initiating and timing circuit for a doppler type chronograph | Expired / Lapsed | 1951-10-11 | 1956-06-26 | 0 | Details |
| US2749533A | Sequence discriminator system for locating information | Expired / Lapsed | 1950-05-23 | 1956-06-05 | 0 | Details |
| US2748270A | Gating system | Expired / Lapsed | 1952-03-31 | 1956-05-29 | 0 | Details |
| US2737633A | Wave guide rotary joint system | Expired / Lapsed | 1951-01-25 | 1956-03-06 | 0 | Details |
| US2731203A | Saturable core circuits for counting and the like | Expired / Lapsed | 1951-05-24 | 1956-01-17 | 0 | Details |
| US2729812A | Apparatus for converting digital information to an analog v… | Expired / Lapsed | 1954-10-04 | 1956-01-03 | 0 | Details |
| US2729808A | Pulse gating circuits and methods | Expired / Lapsed | 1952-12-04 | 1956-01-03 | 0 | Details |
| US2729807A | Gate and memory circuits utilizing magnetic cores | Expired / Lapsed | 1952-11-20 | 1956-01-03 | 0 | Details |
| US2719226A | Timed signal generator | Expired / Lapsed | 1951-06-04 | 1955-09-27 | 0 | Details |
| US2715776A | Stabilized gun control system with aided tracking | Expired / Lapsed | 1942-05-25 | 1955-08-23 | 0 | Details |
| US2712269A | Automatic dive bombsight | Expired / Lapsed | 1945-12-29 | 1955-07-05 | 0 | Details |
| US2710952A | Ring counter utilizing magnetic amplifiers | Expired / Lapsed | 1954-05-12 | 1955-06-14 | 0 | Details |
| US2704489A | Servo system for aircraft turrets | Expired / Lapsed | 1943-04-17 | 1955-03-22 | 0 | Details |
| US2700503A | Electronic binary multiplying computer | Expired / Lapsed | 1950-04-06 | 1955-01-25 | 0 | Details |
| US2699612A | Azimuth data providing system for dirigible craft | Expired / Lapsed | 1950-01-31 | 1955-01-18 | 0 | Details |
| US2696947A | Gun directing system | Expired / Lapsed | 1943-08-28 | 1954-12-14 | 0 | Details |
| US2689953A | Positionally selective communication system | Expired / Lapsed | 1949-05-18 | 1954-09-21 | 0 | Details |
| US2686299A | Selecting network | Expired / Lapsed | 1950-06-24 | 1954-08-10 | 0 | Details |
| US2683596A | Rate of turn instrument | Expired / Lapsed | 1950-07-11 | 1954-07-13 | 0 | Details |
| US2681614A | Recording machine with grouped recording elements operable … | Expired / Lapsed | 1949-09-27 | 1954-06-22 | 0 | Details |
| US2679033A | Pictorial indicator | Expired / Lapsed | 1953-01-05 | 1954-05-18 | 0 | Details |
| US2678177A | Manual booster and automatic pilot servo system | Expired / Lapsed | 1951-12-13 | 1954-05-11 | 0 | Details |
| US2677766A | Scalloped limacon pattern antenna | Expired / Lapsed | 1949-05-18 | 1954-05-04 | 0 | Details |
| US2673337A | Amplifier system utilizing saturable magnetic elements | Expired / Lapsed | 1952-12-04 | 1954-03-23 | 0 | Details |
| US2671169A | Switching circuit | Expired / Lapsed | 1950-07-19 | 1954-03-02 | 0 | Details |
| US2668191A | Wave energy polarization converter | Expired / Lapsed | 1949-06-30 | 1954-02-02 | 0 | Details |
| US2666199A | Radio direction maintaining system | Expired / Lapsed | 1950-05-09 | 1954-01-12 | 0 | Details |
| US2666177A | Servomotor system having differential torque displacement f… | Expired / Lapsed | 1949-04-01 | 1954-01-12 | 0 | Details |
| US2664254A | Air-speed control system | Expired / Lapsed | 1950-01-21 | 1953-12-29 | 0 | Details |
| US2660793A | Stabilized tracking and fire control system | Expired / Lapsed | 1942-05-22 | 1953-12-01 | 0 | Details |
| US2652196A | Wire recording storage mechanism for bookkeeping machines | Expired / Lapsed | 1949-05-20 | 1953-09-15 | 0 | Details |
| US2651771A | Angular motion detector and position indicator | Expired / Lapsed | 1949-10-14 | 1953-09-08 | 0 | Details |
| US2649264A | Flight control system | Expired / Lapsed | 1947-03-15 | 1953-08-18 | 0 | Details |
| US2646946A | Autopilot | Expired / Lapsed | 1950-10-10 | 1953-07-28 | 0 | Details |
| US2647258A | Automatic tracking system | Expired / Lapsed | 1946-03-29 | 1953-07-28 | 0 | Details |
| US2640647A | Magnetizable record element | Expired / Lapsed | 1950-01-13 | 1953-06-02 | 0 | Details |
| US2632886A | Null balance indicator | Expired / Lapsed | 1952-01-02 | 1953-03-24 | 0 | Details |
| US2632386A | Wire type printing machine | Expired / Lapsed | 1949-04-20 | 1953-03-24 | 0 | Details |
| US2629289A | Fire control apparatus for controlling the flight of missil… | Expired / Lapsed | 1945-05-03 | 1953-02-24 | 0 | Details |
| US2627384A | Flight control apparatus | Expired / Lapsed | 1947-08-07 | 1953-02-03 | 0 | Details |
| US2627598A | Phase shift system | Expired / Lapsed | 1947-02-20 | 1953-02-03 | 0 | Details |
| US2625650A | Superregenerative apparatus | Expired / Lapsed | 1948-10-16 | 1953-01-13 | 0 | Details |
| US2624505A | Computer | Expired / Lapsed | 1950-05-02 | 1953-01-06 | 0 | Details |
| US2622441A | Internal-combustion engine power analyzer | Expired / Lapsed | 1947-03-15 | 1952-12-23 | 0 | Details |
| US2621238A | Phase shift timer | Expired / Lapsed | 1947-03-04 | 1952-12-09 | 0 | Details |
| US2620669A | Compensated gyro-vertical | Expired / Lapsed | 1946-11-23 | 1952-12-09 | 0 | Details |
| CA488605A | Timing apparatus | Expired / Lapsed | — | 1952-12-02 | 0 | Details |
| US2617982A | Radio gun control system | Expired / Lapsed | 1942-04-30 | 1952-11-11 | 0 | Details |
| US2613317A | Circuits for object locator apparatus | Expired / Lapsed | 1949-08-27 | 1952-10-07 | 0 | Details |
| US2613351A | Radio navigation device | Expired / Lapsed | 1948-05-18 | 1952-10-07 | 0 | Details |
| US2613350A | Flight indicating system for dirigible craft | Expired / Lapsed | 1948-03-16 | 1952-10-07 | 0 | Details |
| US2612621A | Control circuits for cathode-ray tubes | Expired / Lapsed | 1942-06-18 | 1952-09-30 | 0 | Details |
| US2611127A | Continuous wave navigation system | Expired / Lapsed | 1947-10-28 | 1952-09-16 | 0 | Details |
| US2602611A | Automatic pilot for aircraft | Expired / Lapsed | 1948-01-12 | 1952-07-08 | 0 | Details |
| US2598672A | Marine gyro vertical | Expired / Lapsed | 1945-08-01 | 1952-06-03 | 0 | Details |
| US2595228A | Control circuit for cathode-ray oscilloscopes | Expired / Lapsed | 1948-10-27 | 1952-05-06 | 0 | Details |
| US2595309A | Flight control apparatus for aircraft | Expired / Lapsed | 1946-06-26 | 1952-05-06 | 0 | Details |
| US2595250A | Automatic recovery pilot for aircraft | Expired / Lapsed | 1945-05-15 | 1952-05-06 | 0 | Details |
| US2591697A | Stable reference apparatus | Expired / Lapsed | 1946-08-26 | 1952-04-08 | 0 | Details |
| US2590091A | Magnetic process control | Expired / Lapsed | 1946-04-03 | 1952-03-25 | 0 | Details |
| US2585630A | Digit shifting circuit | Expired / Lapsed | 1949-05-03 | 1952-02-12 | 0 | Details |
| US2584127A | Servo system | Expired / Lapsed | 1946-12-05 | 1952-02-05 | 0 | Details |
| US2583573A | Radio receiving system | Expired / Lapsed | 1945-11-21 | 1952-01-29 | 0 | Details |
| US2581438A | Navigation computer and piloting system | Expired / Lapsed | 1946-03-30 | 1952-01-08 | 0 | Details |
| US2577785A | Computing gun sight | Expired / Lapsed | 1944-07-28 | 1951-12-11 | 0 | Details |
| US2576943A | Wave guide modulation apparatus | Expired / Lapsed | 1945-01-31 | 1951-12-04 | 0 | Details |
| US2574494A | Timing apparatus | Expired / Lapsed | 1946-07-16 | 1951-11-13 | 0 | Details |
| US2568719A | Control system for aircraft control surface and tab | Expired / Lapsed | 1947-04-09 | 1951-09-25 | 0 | Details |
| US2565506A | Omnidirectional radio range system | Expired / Lapsed | 1949-07-26 | 1951-08-28 | 0 | Details |
| US2558758A | Radio velocity indicator | Expired / Lapsed | 1944-01-22 | 1951-07-03 | 0 | Details |
| US2555328A | Great circle direction-keeping instrument | Expired / Lapsed | 1944-01-06 | 1951-06-05 | 0 | Details |
| US2554512A | Accelerometer | Expired / Lapsed | 1946-05-28 | 1951-05-29 | 0 | Details |
| US2553560A | Aircraft turn control | Expired / Lapsed | 1946-07-10 | 1951-05-22 | 0 | Details |
| US2553597A | Aircraft automatic pilot | Expired / Lapsed | 1946-02-23 | 1951-05-22 | 0 | Details |
| US2553546A | Airplane automatic pilot | Expired / Lapsed | 1945-01-31 | 1951-05-22 | 0 | Details |
| US2552527A | Automatic gain-control system for radar direction indicators | Expired / Lapsed | 1945-03-28 | 1951-05-15 | 0 | Details |
| US2548900A | Data presentation apparatus | Expired / Lapsed | 1946-06-12 | 1951-04-17 | 0 | Details |
| US2546271A | Motor control system | Expired / Lapsed | 1946-12-21 | 1951-03-27 | 0 | Details |
| US2541066A | Object detecting and warning system and method | Expired / Lapsed | 1943-11-24 | 1951-02-13 | 0 | Details |
| US2539411A | Automatic pilot | Expired / Lapsed | 1944-02-03 | 1951-01-30 | 0 | Details |
| US2537732A | Carrier for perforated record cards | Expired / Lapsed | 1948-02-18 | 1951-01-09 | 0 | Details |
| US2537065A | Gate generator | Expired / Lapsed | 1944-04-18 | 1951-01-09 | 0 | Details |
| US2534293A | Servomotor and system having improved torque characteristics | Expired / Lapsed | 1946-12-21 | 1950-12-19 | 0 | Details |
| US2534276A | Vibration pickup device and system | Expired / Lapsed | 1944-01-10 | 1950-12-19 | 0 | Details |
| US2531454A | Directive antenna structure | Expired / Lapsed | 1942-02-04 | 1950-11-28 | 0 | Details |
| US2530387A | Motor control circuit | Expired / Lapsed | 1944-05-24 | 1950-11-21 | 0 | Details |
| US2530110A | Nonlinear circuit device utilizing germanium | Expired / Lapsed | 1944-06-02 | 1950-11-14 | 2 | Details |
| US2524758A | Radio direction finding system | Expired / Lapsed | 1946-04-27 | 1950-10-10 | 0 | Details |
| US2524051A | Full-wave, phase-sensitive demodulator | Expired / Lapsed | 1946-11-05 | 1950-10-03 | 0 | Details |
| US2524050A | Apparatus and method of measuring a magnitude exceeding the… | Expired / Lapsed | 1944-03-29 | 1950-10-03 | 0 | Details |
| US2517612A | Stable platform | Expired / Lapsed | 1947-03-29 | 1950-08-08 | 0 | Details |
| US2516930A | Filament forming method | Expired / Lapsed | 1944-04-14 | 1950-08-01 | 0 | Details |
| US2515267A | Grid structure and method of fabrication | Expired / Lapsed | 1947-04-10 | 1950-07-18 | 0 | Details |
| US2513367A | Radiant energy tracking apparatus | Expired / Lapsed | 1948-05-26 | 1950-07-04 | 0 | Details |
| US2513340A | Angular velocity responsive apparatus | Expired / Lapsed | 1945-10-17 | 1950-07-04 | 0 | Details |
| US2512860A | Control means for electric typewriters | Expired / Lapsed | 1949-06-18 | 1950-06-27 | 0 | Details |
| US2512851A | Pulse generator | Expired / Lapsed | 1948-04-03 | 1950-06-27 | 0 | Details |
| US2512879A | Record sensing device of the capacitive type for use with b… | Expired / Lapsed | 1948-01-20 | 1950-06-27 | 0 | Details |
| US2512703A | Radar direction and range indicating apparatus | Expired / Lapsed | 1943-10-14 | 1950-06-27 | 0 | Details |
| US2504604A | Stable vertical mechanism | Expired / Lapsed | 1944-07-01 | 1950-04-18 | 0 | Details |
| US2502456A | Ultra high frequency discriminator and apparatus | Expired / Lapsed | 1943-04-02 | 1950-04-04 | 0 | Details |
| US2500945A | Modulator and frequency changer | Expired / Lapsed | 1943-11-08 | 1950-03-21 | 0 | Details |
| US2499349A | Obstacle avoidance system | Expired / Lapsed | 1943-03-31 | 1950-03-07 | 0 | Details |
| US2497883A | Electronic computer | Expired / Lapsed | 1943-01-28 | 1950-02-21 | 0 | Details |
| US2497094A | Microwave apparatus | Expired / Lapsed | 1945-02-28 | 1950-02-14 | 0 | Details |
| US2496294A | Speed governing system for dirigible craft | Expired / Lapsed | 1944-12-29 | 1950-02-07 | 0 | Details |
| US2496809A | Radio controlled pilot system | Expired / Lapsed | 1943-10-12 | 1950-02-07 | 0 | Details |
| US2495753A | Ground target elimination | Expired / Lapsed | 1943-04-12 | 1950-01-31 | 0 | Details |
| US2495042A | Two-sided mosaic and method of manufacturing same | Expired / Lapsed | 1947-11-12 | 1950-01-17 | 0 | Details |
| US2493772A | Electronic signal mixing circuit | Expired / Lapsed | 1945-04-17 | 1950-01-10 | 0 | Details |
| US2485583A | Radio distance measuring system | Expired / Lapsed | 1943-10-29 | 1949-10-25 | 0 | Details |
| US2485665A | Mixing circuit | Expired / Lapsed | 1943-07-16 | 1949-10-25 | 0 | Details |
| US2485608A | Pulse modulator | Expired / Lapsed | 1943-05-24 | 1949-10-25 | 0 | Details |
| US2484819A | Radio navigation system | Expired / Lapsed | 1946-10-29 | 1949-10-18 | 0 | Details |
| US2484034A | Interval measuring system | Expired / Lapsed | 1945-04-24 | 1949-10-11 | 0 | Details |
| US2484022A | Pick-off device for electrical control systems | Expired / Lapsed | 1945-03-27 | 1949-10-11 | 0 | Details |
| US2482242A | Code selector | Expired / Lapsed | 1948-06-09 | 1949-09-20 | 0 | Details |
| US2479820A | Color television system | Expired / Lapsed | 1947-05-01 | 1949-08-23 | 0 | Details |
| US2479568A | Doppler radar system | Expired / Lapsed | 1943-08-19 | 1949-08-23 | 0 | Details |
| US2478203A | Follow-up motor control circuit | Expired / Lapsed | 1944-04-08 | 1949-08-09 | 0 | Details |
| US2477615A | Pulse delineator | Expired / Lapsed | 1944-01-04 | 1949-08-02 | 0 | Details |
| US2473159A | Counting tube transfer circuit | Expired / Lapsed | 1949-01-29 | 1949-06-14 | 0 | Details |
| US2469419A | Energy directing apparatus | Expired / Lapsed | 1943-10-26 | 1949-05-10 | 0 | Details |
| US2466537A | Cathode-ray tube sweep circuit | Expired / Lapsed | 1947-02-28 | 1949-04-05 | 0 | Details |
| US2464822A | Indicating device | Expired / Lapsed | 1943-08-16 | 1949-03-22 | 0 | Details |
| US2464276A | Radiant energy directivity pattern scanner | Expired / Lapsed | 1943-08-03 | 1949-03-15 | 0 | Details |
| US2462081A | Servomotor system | Expired / Lapsed | 1947-08-22 | 1949-02-22 | 0 | Details |
| US2462095A | Rate circuits | Expired / Lapsed | 1942-06-27 | 1949-02-22 | 0 | Details |
| US2454761A | Ultra high frequency device | Expired / Lapsed | 1942-11-20 | 1948-11-30 | 0 | Details |
| US2454265A | Automatic frequency control system | Expired / Lapsed | 1943-11-06 | 1948-11-16 | 0 | Details |
| US2453711A | Cathode-ray tube control circuit | Expired / Lapsed | 1943-10-04 | 1948-11-16 | 0 | Details |
| US2452575A | Automatic frequency control | Expired / Lapsed | 1943-04-22 | 1948-11-02 | 0 | Details |
| US2449983A | Coaxial line coupling | Expired / Lapsed | 1943-02-04 | 1948-09-28 | 0 | Details |
| US2449542A | Radio object locating device for producing stereoscopic ima… | Expired / Lapsed | 1943-08-14 | 1948-09-21 | 0 | Details |
| US2448509A | Electrical connector | Expired / Lapsed | 1943-05-14 | 1948-09-07 | 0 | Details |
| US2447507A | Balancing circuit | Expired / Lapsed | 1946-01-16 | 1948-08-24 | 0 | Details |
| US2446546A | Pressure responsive controller device | Expired / Lapsed | 1947-06-10 | 1948-08-10 | 0 | Details |
| US2446567A | Alternating current rate circuits | Expired / Lapsed | 1941-12-30 | 1948-08-10 | 0 | Details |
| US2445773A | Rate taking circuit | Expired / Lapsed | 1944-01-22 | 1948-07-27 | 0 | Details |
| US2445811A | High-frequency tube structure | Expired / Lapsed | 1941-12-22 | 1948-07-27 | 0 | Details |
| US2444445A | Radio navigation system | Expired / Lapsed | 1943-11-10 | 1948-07-06 | 0 | Details |
| US2442770A | Pulse generator | Expired / Lapsed | 1943-04-20 | 1948-06-08 | 0 | Details |
| US2442769A | Electronic delay circuits | Expired / Lapsed | 1942-12-30 | 1948-06-08 | 0 | Details |
| US2440777A | Tridimensional radio direction indicator | Expired / Lapsed | 1946-01-31 | 1948-05-04 | 0 | Details |
| US2439044A | Course softening system | Expired / Lapsed | 1943-03-04 | 1948-04-06 | 0 | Details |
| US2438913A | High-frequency filter structure | Expired / Lapsed | 1942-09-02 | 1948-04-06 | 0 | Details |
| US2437286A | Radar device | Expired / Lapsed | 1943-08-17 | 1948-03-09 | 0 | Details |
| US2436408A | Radio wave reflecting transducer system | Expired / Lapsed | 1943-05-27 | 1948-02-24 | 0 | Details |
| US2412537A | Recording and computing machine | Expired / Lapsed | 1940-12-10 | 1946-12-10 | 0 | Details |
| US2398340A | Manufacture of vacuum apparatus | Expired / Lapsed | 1944-07-11 | 1946-04-09 | 0 | Details |
| US2368951A | Shaver motor | Expired / Lapsed | 1942-06-27 | 1945-02-06 | 0 | Details |
| US2323824A | Code interpreting mechanism | Expired / Lapsed | 1938-02-15 | 1943-07-06 | 0 | Details |
| US2302055A | Shearing head | Expired / Lapsed | 1939-02-21 | 1942-11-17 | 0 | Details |
| US2280920A | Computing machine | Expired / Lapsed | 1939-03-17 | 1942-04-28 | 0 | Details |
| US2203355A | Statistical card punch | Expired / Lapsed | 1938-07-23 | 1940-06-04 | 0 | Details |
| US2185260A | Tabulating machine | Expired / Lapsed | 1936-03-05 | 1940-01-02 | 0 | Details |
| US2164425A | Multiple head dry shaver | Expired / Lapsed | 1937-07-09 | 1939-07-04 | 0 | Details |
| US2124182A | Multicontact plug | Expired / Lapsed | 1937-05-20 | 1938-07-19 | 0 | Details |
| US2059277A | Tabulating machine | Expired / Lapsed | 1932-04-02 | 1936-11-03 | 0 | Details |
| US2005450A | Paper feeding mechanism | Expired / Lapsed | 1933-12-09 | 1935-06-18 | 0 | Details |
| US1976198A | Loose leaf binder | Expired / Lapsed | 1931-03-06 | 1934-10-09 | 0 | Details |
| US1919433A | Photographic copying apparatus | Expired / Lapsed | 1926-04-17 | 1933-07-25 | 0 | Details |
| US1853050A | Calculating machine | Expired / Lapsed | 1926-01-29 | 1932-04-12 | 0 | Details |
| US1658363A | Accounting apparatus | Expired / Lapsed | 1920-06-21 | 1928-02-07 | 0 | Details |