RCA Corp
RCA CorpActive Patents
0
Total Holdings
200
Patent Holdings
Filter in Explorer →| Patent No. | Title | Status | Filing Date | Grant Date | Claims | Actions |
|---|---|---|---|---|---|---|
| GB1360470A | Computer input-output chaining system | Expired / Lapsed | 1971-12-03 | — | 0 | Details |
| US4311154A | Nonsymmetrical bulb applicator for hyperthermic treatment o… | Expired / Lapsed | 1979-03-23 | 1982-01-19 | 8 | Details |
| US4282887A | Ridge-waveguide applicator for treatment with electromagnet… | Expired / Lapsed | 1979-10-11 | 1981-08-11 | 8 | Details |
| US3956535A | Metal plated or platable article | Expired / Lapsed | 1974-01-30 | 1976-05-11 | 19 | Details |
| US3883891A | Redundant signal processing error reduction technique | Expired / Lapsed | 1974-08-22 | 1975-05-13 | 11 | Details |
| US3699533A | Memory system including buffer memories | Expired / Lapsed | 1970-10-29 | 1972-10-17 | 11 | Details |
| US3666359A | Correlation peak detector in optical spatial filtering syst… | Expired / Lapsed | 1970-08-26 | 1972-05-30 | 0 | Details |
| US3566357A | Multi-processor multi-programed computer system | Expired / Lapsed | 1966-07-05 | 1971-02-23 | 0 | Details |
| US3443188A | Switching circuits | Expired / Lapsed | 1967-02-27 | 1969-05-06 | 0 | Details |
| US3413448A | Information handling apparatus | Expired / Lapsed | 1961-05-25 | 1968-11-26 | 2 | Details |
| US3395398A | Means for servicing a plurality of data buffers | Expired / Lapsed | 1965-12-16 | 1968-07-30 | 0 | Details |
| US3303474A | Duplexing system for controlling online and standby conditi… | Expired / Lapsed | 1963-01-17 | 1967-02-07 | 2 | Details |
| US3263030A | Digital crosspoint switch | Expired / Lapsed | 1961-09-26 | 1966-07-26 | 2 | Details |
| US3241114A | Comparator systems | Expired / Lapsed | 1962-11-27 | 1966-03-15 | 2 | Details |
| US3237176A | Binary recording system | Expired / Lapsed | 1962-01-26 | 1966-02-22 | 2 | Details |
| US3229223A | Laser modulation system having internal polarization vector… | Expired / Lapsed | 1962-09-10 | 1966-01-11 | 2 | Details |
| US3107277A | Electrical devices | Expired / Lapsed | 1960-07-05 | 1963-10-15 | 1 | Details |
| US3090956A | Steerable antenna | Expired / Lapsed | 1960-12-23 | 1963-05-21 | 2 | Details |
| US3054958A | Pulse generating system | Expired / Lapsed | 1956-10-12 | 1962-09-18 | 0 | Details |
| US3034356A | Balanced pressure transducers | Expired / Lapsed | 1958-05-06 | 1962-05-15 | 0 | Details |
| US3008129A | Memory systems | Expired / Lapsed | 1956-07-18 | 1961-11-07 | 0 | Details |
| US3007137A | Information handling system | Expired / Lapsed | 1956-12-14 | 1961-10-31 | 0 | Details |
| US2961643A | Information handling system | Expired / Lapsed | 1954-07-01 | 1960-11-22 | 0 | Details |
| US2951234A | Storage interrogation system | Expired / Lapsed | 1956-10-31 | 1960-08-30 | 0 | Details |
| US2948884A | Gating pulse generator | Expired / Lapsed | 1956-06-01 | 1960-08-09 | 0 | Details |
| US2929885A | Semiconductor transducers | Expired / Lapsed | 1953-05-20 | 1960-03-22 | 0 | Details |
| US2925588A | Memory reading system | Expired / Lapsed | 1954-12-31 | 1960-02-16 | 0 | Details |
| US2911622A | Serial memory | Expired / Lapsed | 1954-07-01 | 1959-11-03 | 0 | Details |
| US2884616A | Multiple character comparator | Expired / Lapsed | 1954-04-30 | 1959-04-28 | 0 | Details |
| US2829075A | Field controlled semiconductor devices and methods of makin… | Expired / Lapsed | 1954-09-09 | 1958-04-01 | 1 | Details |
| US2810901A | Magnetic logic systems | Expired / Lapsed | 1956-02-29 | 1957-10-22 | 0 | Details |
| US2797327A | Semi-conductor sawtooth wave generator | Expired / Lapsed | 1954-11-17 | 1957-06-25 | 0 | Details |
| US2772387A | Power supply with regulated positive and negative output vo… | Expired / Lapsed | 1953-10-29 | 1956-11-27 | 0 | Details |
| US2731631A | Code converter circuit | Expired / Lapsed | 1952-10-31 | 1956-01-17 | 0 | Details |
| US2728857A | Electronic switching | Expired / Lapsed | 1952-09-09 | 1955-12-27 | 0 | Details |
| US2719965A | Magnetic memory matrix writing system | Expired / Lapsed | 1954-06-15 | 1955-10-04 | 0 | Details |
| US2705284A | Frequency stabilization system | Expired / Lapsed | 1948-11-04 | 1955-03-29 | 0 | Details |
| US2702274A | Method of making an electrode screen by cathode sputtering | Expired / Lapsed | 1951-04-02 | 1955-02-15 | 2 | Details |
| US2702382A | Radio pulse-echo locator system for detecting moving objects | Expired / Lapsed | 1944-04-10 | 1955-02-15 | 0 | Details |
| US2677721A | Color television system | Expired / Lapsed | 1949-09-24 | 1954-05-04 | 0 | Details |
| US2677119A | Ground controlled aircraft communication system | Expired / Lapsed | 1950-07-24 | 1954-04-27 | 0 | Details |
| US2674727A | Parity generator | Expired / Lapsed | 1952-10-14 | 1954-04-06 | 0 | Details |
| US2666902A | Frequency modulator transistor circuits | Expired / Lapsed | 1950-06-30 | 1954-01-19 | 0 | Details |
| US2646542A | High-voltage system | Expired / Lapsed | 1951-03-22 | 1953-07-21 | 0 | Details |
| US2645971A | Surface contour measurement | Expired / Lapsed | 1949-06-28 | 1953-07-21 | 0 | Details |
| US2639324A | Tuned inductive coupling system | Expired / Lapsed | 1948-04-29 | 1953-05-19 | 0 | Details |
| US2637767A | Wide band microwave spectroscopy | Expired / Lapsed | 1949-07-16 | 1953-05-05 | 0 | Details |
| US2634324A | Color television | Expired / Lapsed | 1948-12-01 | 1953-04-07 | 0 | Details |
| US2629767A | Semiconductor amplifier or oscillator device | Expired / Lapsed | 1949-08-31 | 1953-02-24 | 0 | Details |
| US2605306A | Semiconductor multivibrator circuit | Expired / Lapsed | 1949-10-15 | 1952-07-29 | 0 | Details |
| US2586482A | Pickup tube for color television | Expired / Lapsed | 1947-11-20 | 1952-02-19 | 0 | Details |
| US2582850A | Photocell | Expired / Lapsed | 1949-03-03 | 1952-01-15 | 2 | Details |
| US2552070A | Color television camera | Expired / Lapsed | 1947-06-02 | 1951-05-08 | 0 | Details |
| US2542700A | Pulse modulation system | Expired / Lapsed | 1945-04-18 | 1951-02-20 | 0 | Details |
| US2540442A | Electronic counter | Expired / Lapsed | 1948-08-11 | 1951-02-06 | 0 | Details |
| US2537593A | Frequency modulation altimeter and range finder | Expired / Lapsed | 1947-02-26 | 1951-01-09 | 0 | Details |
| US2534387A | Morse code printing system | Expired / Lapsed | 1946-11-15 | 1950-12-19 | 0 | Details |
| US2534535A | Secrecy system | Expired / Lapsed | 1942-12-07 | 1950-12-19 | 0 | Details |
| US2533871A | Radio distance measuring system | Expired / Lapsed | 1944-06-16 | 1950-12-12 | 0 | Details |
| US2528512A | Energizing circuit for servo systems | Expired / Lapsed | 1945-09-29 | 1950-11-07 | 0 | Details |
| US2527222A | Scanning antenna | Expired / Lapsed | 1947-10-30 | 1950-10-24 | 0 | Details |
| US2526353A | Stabilized low-frequency oscillator | Expired / Lapsed | 1946-11-15 | 1950-10-17 | 0 | Details |
| US2511216A | Process of making electrical resistors | Expired / Lapsed | 1946-08-01 | 1950-06-13 | 2 | Details |
| US2499484A | Voltage rectifying circuit | Expired / Lapsed | 1945-11-28 | 1950-03-07 | 0 | Details |
| US2488927A | Variable bridge transducer and its combination with a radio… | Expired / Lapsed | 1945-03-10 | 1949-11-22 | 0 | Details |
| US2473444A | Computing system | Expired / Lapsed | 1944-02-29 | 1949-06-14 | 0 | Details |
| US2467777A | Frequency measuring circuit | Expired / Lapsed | 1942-04-01 | 1949-04-19 | 0 | Details |
| US2462292A | Light interference distance measuring device having photoel… | Expired / Lapsed | 1943-08-13 | 1949-02-22 | 0 | Details |
| US2446249A | Pickup tube for color television | Expired / Lapsed | 1946-05-04 | 1948-08-03 | 0 | Details |
| US2445215A | Electronic computer | Expired / Lapsed | 1943-10-21 | 1948-07-13 | 0 | Details |
| US2442951A | System for focusing and for directing radio-frequency energy | Expired / Lapsed | 1944-05-27 | 1948-06-08 | 0 | Details |
| US2442403A | Electronic switching and computing device | Expired / Lapsed | 1942-09-23 | 1948-06-01 | 0 | Details |
| US2437085A | Heat detection device | Expired / Lapsed | 1943-03-12 | 1948-03-02 | 0 | Details |
| US2433804A | Frequency-modulated pulse radio locating system | Expired / Lapsed | 1943-04-23 | 1947-12-30 | 0 | Details |
| US2431923A | Photographic record and method of forming same | Expired / Lapsed | 1943-08-23 | 1947-12-02 | 0 | Details |
| US2431591A | Electronic computer | Expired / Lapsed | 1942-03-31 | 1947-11-25 | 0 | Details |
| US2431167A | Radio alarm and two-way telephone system | Expired / Lapsed | 1944-02-03 | 1947-11-18 | 0 | Details |
| US2430013A | Impedance matching means for mechanical waves | Expired / Lapsed | 1942-06-10 | 1947-11-04 | 0 | Details |
| US2429228A | Electronic computer | Expired / Lapsed | 1945-06-11 | 1947-10-21 | 0 | Details |
| US2428811A | Electronic computing device | Expired / Lapsed | 1943-10-30 | 1947-10-14 | 0 | Details |
| US2425488A | Horn antenna | Expired / Lapsed | 1943-07-03 | 1947-08-12 | 0 | Details |
| US2424833A | Frequency comparison and control circuit | Expired / Lapsed | 1944-10-18 | 1947-07-29 | 0 | Details |
| US2423023A | Obstacle detection by radio waves | Expired / Lapsed | 1938-09-30 | 1947-06-24 | 0 | Details |
| US2422295A | Recorder for radio locators | Expired / Lapsed | 1943-08-30 | 1947-06-17 | 0 | Details |
| US2422064A | Ground speed indicator | Expired / Lapsed | 1943-10-26 | 1947-06-10 | 0 | Details |
| US2422134A | Distance indicator | Expired / Lapsed | 1943-03-29 | 1947-06-10 | 0 | Details |
| US2421521A | Interlacing system | Expired / Lapsed | 1945-07-26 | 1947-06-03 | 0 | Details |
| US2420374A | Pulse multiplex transmission system | Expired / Lapsed | 1944-07-01 | 1947-05-13 | 0 | Details |
| US2414266A | Antenna | Expired / Lapsed | 1942-06-27 | 1947-01-14 | 0 | Details |
| US2412822A | Photoelectric device | Expired / Lapsed | 1942-03-26 | 1946-12-17 | 0 | Details |
| US2412702A | Object detection and location | Expired / Lapsed | 1939-02-28 | 1946-12-17 | 0 | Details |
| US2411573A | Frequency counter circuit | Expired / Lapsed | 1944-11-30 | 1946-11-26 | 0 | Details |
| US2410424A | Obstacle detection system | Expired / Lapsed | 1942-08-18 | 1946-11-05 | 0 | Details |
| US2409449A | Phase modulator | Expired / Lapsed | 1943-12-30 | 1946-10-15 | 0 | Details |
| US2404250A | Computing system | Expired / Lapsed | 1944-01-22 | 1946-07-16 | 0 | Details |
| US2403429A | Radio beacon system | Expired / Lapsed | 1942-11-02 | 1946-07-09 | 0 | Details |
| US2401425A | Light valve | Expired / Lapsed | 1945-02-13 | 1946-06-04 | 0 | Details |
| US2385641A | Automatic recording system | Expired / Lapsed | 1942-02-11 | 1945-09-25 | 0 | Details |
| US2383822A | Oscillation generator | Expired / Lapsed | 1942-03-04 | 1945-08-28 | 0 | Details |
| US2383322A | Multiband receiver with band spread | Expired / Lapsed | 1942-07-25 | 1945-08-21 | 0 | Details |
| US2381496A | Method of generating currents for nonsignaling purposes | Expired / Lapsed | 1942-10-10 | 1945-08-07 | 0 | Details |
| US2371373A | Balanced frequency modulation system | Expired / Lapsed | 1943-06-12 | 1945-03-13 | 0 | Details |
| US2362000A | Reception of frequency modulated waves | Expired / Lapsed | 1941-12-20 | 1944-11-07 | 0 | Details |
| US2361634A | Record reproduction circuit | Expired / Lapsed | 1942-10-06 | 1944-10-31 | 0 | Details |
| US2352777A | Range finder | Expired / Lapsed | 1942-04-30 | 1944-07-04 | 0 | Details |
| US2344618A | Radio air raid warning system | Expired / Lapsed | 1941-07-31 | 1944-03-21 | 0 | Details |
| US2341232A | Ninety degree phase shifter | Expired / Lapsed | 1942-09-30 | 1944-02-08 | 0 | Details |
| US2339851A | Automatic tuning control | Expired / Lapsed | 1941-05-28 | 1944-01-25 | 0 | Details |
| US2338234A | Evaporation of transparent material on glass | Expired / Lapsed | 1941-01-02 | 1944-01-04 | 0 | Details |
| US2338497A | Lens coating | Expired / Lapsed | 1940-07-31 | 1944-01-04 | 0 | Details |
| US2337328A | Electrical measuring circuit | Expired / Lapsed | 1941-12-30 | 1943-12-21 | 0 | Details |
| US2334020A | Glass-to-metal seal | Expired / Lapsed | 1941-10-08 | 1943-11-09 | 0 | Details |
| US2333688A | Distance measuring system | Expired / Lapsed | 1937-10-29 | 1943-11-09 | 0 | Details |
| US2333005A | Method for retaining insulators within tubes | Expired / Lapsed | 1941-05-15 | 1943-10-26 | 0 | Details |
| US2332253A | Combining unit | Expired / Lapsed | 1942-01-21 | 1943-10-19 | 0 | Details |
| US2331136A | Transmission line seal and insulator | Expired / Lapsed | 1939-12-23 | 1943-10-05 | 0 | Details |
| US2325652A | Drying method | Expired / Lapsed | 1941-08-20 | 1943-08-03 | 0 | Details |
| US2324279A | Amplifier | Expired / Lapsed | 1941-11-29 | 1943-07-13 | 0 | Details |
| US2323966A | Amplifier | Expired / Lapsed | 1938-10-07 | 1943-07-13 | 0 | Details |
| US2323376A | Variable permeability tuning system | Expired / Lapsed | 1940-04-27 | 1943-07-06 | 0 | Details |
| US2321269A | Frequency modulation | Expired / Lapsed | 1941-11-21 | 1943-06-08 | 0 | Details |
| US2313966A | Cathode ray tube system | Expired / Lapsed | 1941-03-31 | 1943-03-16 | 0 | Details |
| US2313666A | Logarithmic instrument circuit | Expired / Lapsed | 1940-01-26 | 1943-03-09 | 0 | Details |
| US2312127A | Photoelectric controlled oscillator device | Expired / Lapsed | 1939-11-07 | 1943-02-23 | 0 | Details |
| US2299945A | Direct current reinserting circuit | Expired / Lapsed | 1940-11-27 | 1942-10-27 | 0 | Details |
| US2296962A | Frequency modulation | Expired / Lapsed | 1939-12-22 | 1942-09-29 | 0 | Details |
| US2289987A | Electronic keying device | Expired / Lapsed | 1940-12-28 | 1942-07-14 | 0 | Details |
| US2289988A | Electronic keying device | Expired / Lapsed | 1940-12-28 | 1942-07-14 | 0 | Details |
| US2289794A | Circuit arrangement for two-way radio telephone systems | Expired / Lapsed | 1940-11-30 | 1942-07-14 | 0 | Details |
| US2288740A | Phase adjuster | Expired / Lapsed | 1938-10-20 | 1942-07-07 | 0 | Details |
| US2286442A | Amplitude limiter circuit | Expired / Lapsed | 1940-12-06 | 1942-06-16 | 0 | Details |
| US2285684A | Remote control system | Expired / Lapsed | 1938-09-10 | 1942-06-09 | 0 | Details |
| US2283924A | Magnetically tuned high frequency circuits | Expired / Lapsed | 1935-12-31 | 1942-05-26 | 0 | Details |
| US2280530A | Frequency modulated wave detector | Expired / Lapsed | 1940-07-17 | 1942-04-21 | 0 | Details |
| US2280707A | Apparatus for and method of frequency modulating | Expired / Lapsed | 1940-05-31 | 1942-04-21 | 0 | Details |
| US2280026A | Ultra short wave system | Expired / Lapsed | 1939-09-01 | 1942-04-14 | 0 | Details |
| US2275256A | Piezometer | Expired / Lapsed | 1939-11-30 | 1942-03-03 | 0 | Details |
| US2274486A | Piezoelectric resonator circuit | Expired / Lapsed | 1940-05-18 | 1942-02-24 | 0 | Details |
| US2274262A | Air speed indicator | Expired / Lapsed | 1939-05-31 | 1942-02-24 | 0 | Details |
| US2273639A | Selectivity control circuit | Expired / Lapsed | 1939-06-22 | 1942-02-17 | 0 | Details |
| US2270023A | Superheterodyne receiver | Expired / Lapsed | 1939-03-01 | 1942-01-13 | 0 | Details |
| US2258223A | Mounting of cylindrical lenses | Expired / Lapsed | 1939-11-30 | 1941-10-07 | 0 | Details |
| US2255757A | Audio frequency amplifier | Expired / Lapsed | 1939-07-29 | 1941-09-16 | 0 | Details |
| US2252770A | Light sensitive electrode and method of manufacture | Expired / Lapsed | 1940-04-30 | 1941-08-19 | 0 | Details |
| US2250532A | Radio relaying system | Expired / Lapsed | 1938-10-29 | 1941-07-29 | 0 | Details |
| US2248442A | Frequency generator | Expired / Lapsed | 1939-06-16 | 1941-07-08 | 0 | Details |
| US2246164A | Frequency modulator | Expired / Lapsed | 1940-01-31 | 1941-06-17 | 0 | Details |
| US2243141A | Radio receiver circuits | Expired / Lapsed | 1940-05-18 | 1941-05-27 | 0 | Details |
| US2234293A | Antenna system | Expired / Lapsed | 1939-09-19 | 1941-03-11 | 0 | Details |
| US2233275A | Navigational instrument | Expired / Lapsed | 1939-01-31 | 1941-02-25 | 0 | Details |
| US2232390A | Automatic frequency control | Expired / Lapsed | 1938-04-27 | 1941-02-18 | 0 | Details |
| US2228883A | High speed logarithmic voltage recorder | Expired / Lapsed | 1938-03-19 | 1941-01-14 | 0 | Details |
| US2226214A | Transmitter | Expired / Lapsed | 1938-10-29 | 1940-12-24 | 0 | Details |
| US2221115A | Multiple trace oscillograph system | Expired / Lapsed | 1937-06-30 | 1940-11-12 | 0 | Details |
| US2212206A | Electron device | Expired / Lapsed | 1937-10-21 | 1940-08-20 | 0 | Details |
| US2211091A | Superregenerative magnetron receiver | Expired / Lapsed | 1938-01-31 | 1940-08-13 | 0 | Details |
| US2205250A | Radio and other high frequency feeder arrangements | Expired / Lapsed | 1937-04-19 | 1940-06-18 | 0 | Details |
| US2196583A | Unitary optical assembly | Expired / Lapsed | 1938-05-28 | 1940-04-09 | 0 | Details |
| US2194559A | Frequency responsive relay | Expired / Lapsed | 1937-04-28 | 1940-03-26 | 0 | Details |
| US2192959A | Tone control system | Expired / Lapsed | 1937-04-30 | 1940-03-12 | 0 | Details |
| US2188165A | Radio system | Expired / Lapsed | 1937-05-14 | 1940-01-23 | 0 | Details |
| US2175252A | Short wave antenna | Expired / Lapsed | 1937-06-12 | 1939-10-10 | 0 | Details |
| US2173231A | Measuring instrument | Expired / Lapsed | 1937-06-22 | 1939-09-19 | 0 | Details |
| US2171216A | Cathode ray electrical measuring device | Expired / Lapsed | 1938-07-01 | 1939-08-29 | 0 | Details |
| US2169374A | Oscillation generation system | Expired / Lapsed | 1937-01-04 | 1939-08-15 | 0 | Details |
| US2158285A | Impulse measuring circuit | Expired / Lapsed | 1937-06-22 | 1939-05-16 | 0 | Details |
| US2141426A | High fidelity receiving system | Expired / Lapsed | 1936-08-29 | 1938-12-27 | 0 | Details |
| US2140004A | Electrical oscillation generator | Expired / Lapsed | 1937-01-13 | 1938-12-13 | 0 | Details |
| US2121877A | Ultrahigh frequency electron discharge modulator | Expired / Lapsed | 1935-12-09 | 1938-06-28 | 0 | Details |
| US2122193A | Recording and reproduction of sound | Expired / Lapsed | 1935-02-26 | 1938-06-28 | 0 | Details |
| US2121359A | Apparatus for timing of periodic events | Expired / Lapsed | 1937-03-31 | 1938-06-21 | 0 | Details |
| US2121103A | Frequency variation response circuits | Expired / Lapsed | 1935-10-17 | 1938-06-21 | 0 | Details |
| US2120099A | Mosaic screen structure | Expired / Lapsed | 1933-03-30 | 1938-06-07 | 0 | Details |
| US2113214A | Method of frequency or phase modulation | Expired / Lapsed | 1936-10-29 | 1938-04-05 | 0 | Details |
| US2112824A | Radio transmitter for direction finding devices | Expired / Lapsed | 1935-10-23 | 1938-04-05 | 0 | Details |
| US2113395A | Automatic fidelity control circuits | Expired / Lapsed | 1935-05-25 | 1938-04-05 | 0 | Details |
| US2113226A | Sound recording and reproducing system | Expired / Lapsed | 1935-05-08 | 1938-04-05 | 0 | Details |
| US2097874A | Radio receiver | Expired / Lapsed | 1933-05-18 | 1937-11-02 | 0 | Details |
| US2089044A | Electron discharge tube | Expired / Lapsed | 1936-05-16 | 1937-08-03 | 0 | Details |
| US2087428A | Phase modulator | Expired / Lapsed | 1933-12-11 | 1937-07-20 | 0 | Details |
| US2078302A | Modulating system for short waves | Expired / Lapsed | 1933-08-31 | 1937-04-27 | 0 | Details |
| US2072278A | Voltage multiplier circuit | Expired / Lapsed | 1933-05-09 | 1937-03-02 | 0 | Details |
| US2060611A | Receiving system | Expired / Lapsed | 1933-12-23 | 1936-11-10 | 0 | Details |
| US2055090A | Electrical oscillation generator | Expired / Lapsed | 1934-02-17 | 1936-09-22 | 0 | Details |
| US2050059A | Relay system | Expired / Lapsed | 1934-03-01 | 1936-08-04 | 0 | Details |
| US2045107A | Phase modulation | Expired / Lapsed | 1932-12-02 | 1936-06-23 | 0 | Details |
| US2042302A | Radio relaying system | Expired / Lapsed | 1935-01-10 | 1936-05-26 | 0 | Details |
| US2033231A | Modulation system | Expired / Lapsed | 1931-09-19 | 1936-03-10 | 0 | Details |
| US2022406A | Protective device in amplifier circuit | Expired / Lapsed | 1931-07-07 | 1935-11-26 | 0 | Details |
| US2019446A | Phase and amplitude modulation receiver | Expired / Lapsed | 1934-04-09 | 1935-10-29 | 0 | Details |
| US2018348A | Means for controlling the terminal pressure of an electric … | Expired / Lapsed | 1929-06-20 | 1935-10-22 | 0 | Details |
| US2014102A | Direct reading vacuum tube meter | Expired / Lapsed | 1934-05-29 | 1935-09-10 | 0 | Details |
| US2012710A | Variable condenser | Expired / Lapsed | 1931-10-16 | 1935-08-27 | 0 | Details |
| US1993395A | Signal generator | Expired / Lapsed | 1932-03-10 | 1935-03-05 | 0 | Details |
| US1961170A | Recording the wave-length to which a radio set is tuned | Expired / Lapsed | 1929-11-07 | 1934-06-05 | 0 | Details |
| US1958996A | Optical system for sound reproducers | Expired / Lapsed | 1931-11-28 | 1934-05-15 | 0 | Details |
| US1932232A | Radio receiving set | Expired / Lapsed | 1931-04-23 | 1933-10-24 | 0 | Details |
| US1907965A | Automatic tuning | Expired / Lapsed | 1927-11-01 | 1933-05-09 | 0 | Details |
| US1849884A | Side band selector receiver | Expired / Lapsed | 1928-11-19 | 1932-03-15 | 0 | Details |
| US1694646A | Wireless telegraph receiver | Expired / Lapsed | 1919-06-25 | 1928-12-11 | 0 | Details |