Hartford National Bank and Trust Co
Hartford NActive Patents
0
Total Holdings
234
Patent Holdings
Filter in Explorer →| Patent No. | Title | Status | Filing Date | Grant Date | Claims | Actions |
|---|---|---|---|---|---|---|
| US2816267A | Pulse-code modulation device | Expired / Lapsed | 1954-09-15 | 1957-12-10 | 0 | Details |
| US2780682A | Difference amplifier | Expired / Lapsed | 1955-01-24 | 1957-02-05 | 0 | Details |
| US2775657A | Dual channel amplifying circuit | Expired / Lapsed | 1952-04-03 | 1956-12-25 | 0 | Details |
| US2775726A | Apparatus for registering pulses | Expired / Lapsed | 1951-11-01 | 1956-12-25 | 0 | Details |
| US2772862A | Device for the transmission of mechanical vibrations to a m… | Expired / Lapsed | 1954-02-10 | 1956-12-04 | 0 | Details |
| US2773241A | Automatic frequency control | Expired / Lapsed | 1953-05-22 | 1956-12-04 | 0 | Details |
| US2773188A | Automatic frequency control | Expired / Lapsed | 1952-09-25 | 1956-12-04 | 0 | Details |
| US2770712A | Illuminated dial plate | Expired / Lapsed | 1952-01-09 | 1956-11-13 | 0 | Details |
| US2768293A | Frequency-modulated oscillator with automatic frequency cor… | Expired / Lapsed | 1951-03-23 | 1956-10-23 | 0 | Details |
| US2762778A | Method of making magneticallyanisotropic permanent magnets | Expired / Lapsed | 1952-12-10 | 1956-09-11 | 2 | Details |
| US2762777A | Permanent magnet and method of making the same | Expired / Lapsed | 1951-07-30 | 1956-09-11 | 2 | Details |
| US2760002A | Time-multiplex pulse modulation communication system | Expired / Lapsed | 1950-10-14 | 1956-08-21 | 0 | Details |
| US2755457A | Tuning indicator | Expired / Lapsed | 1954-12-22 | 1956-07-17 | 0 | Details |
| US2752496A | Circuit arrangement for automatic resonance tuning of a hig… | Expired / Lapsed | 1952-02-26 | 1956-06-26 | 0 | Details |
| US2751318A | Method of manufacturing coils | Expired / Lapsed | 1954-05-14 | 1956-06-19 | 2 | Details |
| US2748304A | Electric discharge tube for intensifying fluorescent images… | Expired / Lapsed | 1951-03-01 | 1956-05-29 | 0 | Details |
| US2748317A | Mutator system, more particularly a rectifying system, in t… | Expired / Lapsed | 1951-01-04 | 1956-05-29 | 0 | Details |
| US2746241A | Hot-gas reciprocating engine | Expired / Lapsed | 1952-04-17 | 1956-05-22 | 0 | Details |
| US2745966A | Electron-diffraction apparatus | Expired / Lapsed | 1952-11-19 | 1956-05-15 | 2 | Details |
| US2744960A | Time-multiplex pulse-code modulation signal transmission sy… | Expired / Lapsed | 1951-05-09 | 1956-05-08 | 0 | Details |
| US2744959A | Pulse-code modulation transmitter | Expired / Lapsed | 1951-04-14 | 1956-05-08 | 0 | Details |
| US2740031A | Miniature temperature-responsive resistor | Expired / Lapsed | 1953-07-29 | 1956-03-27 | 2 | Details |
| US2739265A | Circuit-arrangement for use in automatic telephone system | Expired / Lapsed | 1953-05-05 | 1956-03-20 | 0 | Details |
| US2736890A | Color-television camera device | Expired / Lapsed | 1952-07-15 | 1956-02-28 | 0 | Details |
| US2728026A | Circuit-arrangement for scanning equidistant lines on a scr… | Expired / Lapsed | 1951-12-26 | 1955-12-20 | 0 | Details |
| US2728050A | Device for modulating ultra-short waves in a transmission l… | Expired / Lapsed | 1951-05-09 | 1955-12-20 | 0 | Details |
| US2722617A | Magnetic circuits and devices | Expired / Lapsed | 1952-11-19 | 1955-11-01 | 0 | Details |
| US2721158A | Power transmission belt | Expired / Lapsed | 1950-08-14 | 1955-10-18 | 2 | Details |
| US2719250A | Electronic register circuit | Expired / Lapsed | 1952-10-01 | 1955-09-27 | 0 | Details |
| US2719191A | Circuit-arrangement of the kind comprising a plurality of a… | Expired / Lapsed | 1951-09-12 | 1955-09-27 | 0 | Details |
| US2699494A | Suppressed carrier single side band radio transmission syst… | Expired / Lapsed | 1951-03-23 | 1955-01-11 | 0 | Details |
| US2698876A | Transmitting device for frequencyshift telegraphy | Expired / Lapsed | 1953-05-07 | 1955-01-04 | 0 | Details |
| US2698622A | Phase sensitive control for shortwave therapy devices | Expired / Lapsed | 1951-12-11 | 1955-01-04 | 0 | Details |
| US2697815A | Angular modulation device | Expired / Lapsed | 1953-05-19 | 1954-12-21 | 0 | Details |
| US2691768A | Coil assembly with variable premagnetization | Expired / Lapsed | 1952-03-11 | 1954-10-12 | 0 | Details |
| US2691121A | Circuit-arrangement for energizing relays | Expired / Lapsed | 1952-03-01 | 1954-10-05 | 0 | Details |
| US2677663A | Manganite composition | Expired / Lapsed | 1950-02-04 | 1954-05-04 | 2 | Details |
| US2676283A | Oscillographic device | Expired / Lapsed | 1951-08-07 | 1954-04-20 | 0 | Details |
| US2676236A | Magnetostriction transducer | Expired / Lapsed | 1951-03-23 | 1954-04-20 | 0 | Details |
| US2676262A | Automatic frequency control system for oscillators | Expired / Lapsed | 1951-03-20 | 1954-04-20 | 0 | Details |
| US2676214A | Pulse amplifier | Expired / Lapsed | 1951-02-13 | 1954-04-20 | 0 | Details |
| US2676269A | Circuit arrangement for detecting photons or corpucular par… | Expired / Lapsed | 1949-11-25 | 1954-04-20 | 0 | Details |
| US2676210A | Potential comparing selector circuit | Expired / Lapsed | 1949-07-28 | 1954-04-20 | 0 | Details |
| US2667585A | Device for producing screening images of body sections | Expired / Lapsed | 1952-01-14 | 1954-01-26 | 0 | Details |
| US2665220A | Method of manufacturing luminescent screens | Expired / Lapsed | 1949-02-26 | 1954-01-05 | 2 | Details |
| US2663814A | Electron-optical image intensifier | Expired / Lapsed | 1951-10-15 | 1953-12-22 | 0 | Details |
| US2662214A | Frequency-modulated oscillator | Expired / Lapsed | 1951-07-30 | 1953-12-08 | 0 | Details |
| US2662209A | Electric circuit | Expired / Lapsed | 1949-11-23 | 1953-12-08 | 0 | Details |
| US2662170A | Radio receiving circuit with automatic volume control and n… | Expired / Lapsed | 1949-07-26 | 1953-12-08 | 0 | Details |
| US2662113A | Pulse-code modulation communication system | Expired / Lapsed | 1949-02-10 | 1953-12-08 | 0 | Details |
| US2662118A | Pulse modulation system for transmitting the change in the … | Expired / Lapsed | 1949-02-10 | 1953-12-08 | 0 | Details |
| US2662181A | Automatic-frequency control apparatus for maintaining a pre… | Expired / Lapsed | 1948-08-13 | 1953-12-08 | 0 | Details |
| US2662176A | Circuit arrangement comprising at least one switch for the … | Expired / Lapsed | 1948-03-06 | 1953-12-08 | 0 | Details |
| US2662175A | Multiplex transmission device | Expired / Lapsed | 1948-02-18 | 1953-12-08 | 0 | Details |
| US2661734A | Arrangement for recording variations in the electrical resi… | Expired / Lapsed | 1948-01-17 | 1953-12-08 | 0 | Details |
| US2661622A | Electric vibration pick-up | Expired / Lapsed | 1947-07-22 | 1953-12-08 | 0 | Details |
| US2657282A | Negative feedback amplifier circuit | Expired / Lapsed | 1950-12-22 | 1953-10-27 | 0 | Details |
| US2654002A | Circuit-arrangement in a telephone system for the reception… | Expired / Lapsed | 1951-03-03 | 1953-09-29 | 0 | Details |
| US2650340A | Arrangement for converting direct voltages into alternating… | Expired / Lapsed | 1949-04-29 | 1953-08-25 | 0 | Details |
| US2647239A | Passive four terminal network for gyrating a current into a… | Expired / Lapsed | 1948-03-06 | 1953-07-28 | 0 | Details |
| US2645758A | Electromagnetic device for amplitude-modulation of high-fre… | Expired / Lapsed | 1951-04-14 | 1953-07-14 | 0 | Details |
| US2644909A | Circuit-arrangement comprising a cathode-ray tube | Expired / Lapsed | 1951-02-13 | 1953-07-07 | 0 | Details |
| US2642540A | Circuit arrangement for X-ray tubes | Expired / Lapsed | 1951-08-28 | 1953-06-16 | 0 | Details |
| US2640883A | Marker control arrangement for selectors | Expired / Lapsed | 1949-07-29 | 1953-06-02 | 0 | Details |
| US2636860A | Magnetic core | Expired / Lapsed | 1946-04-10 | 1953-04-28 | 2 | Details |
| US2623178A | Blocking oscillator | Expired / Lapsed | 1951-03-20 | 1952-12-23 | 0 | Details |
| US2623177A | Automatic frequency control system | Expired / Lapsed | 1950-11-02 | 1952-12-23 | 0 | Details |
| US2622219A | Television image tube | Expired / Lapsed | 1950-07-07 | 1952-12-16 | 0 | Details |
| US2616223A | Device for converting electrical energy into mechanical osc… | Expired / Lapsed | 1951-12-26 | 1952-11-04 | 0 | Details |
| US2616960A | Circuit arrangement for transmitting an alternating voltage… | Expired / Lapsed | 1950-04-03 | 1952-11-04 | 0 | Details |
| US2617058A | Television transmitting tube | Expired / Lapsed | 1950-02-24 | 1952-11-04 | 0 | Details |
| US2616813A | Condenser | Expired / Lapsed | 1949-10-29 | 1952-11-04 | 2 | Details |
| US2616244A | Device for varying the quantity of working medium in hot-ga… | Expired / Lapsed | 1949-06-21 | 1952-11-04 | 0 | Details |
| US2616243A | Regulating device for varying the amount of working medium … | Expired / Lapsed | 1949-04-23 | 1952-11-04 | 0 | Details |
| US2617037A | Automatic frequency control circuit | Expired / Lapsed | 1949-02-17 | 1952-11-04 | 0 | Details |
| US2616958A | Pulse counting circuit | Expired / Lapsed | 1949-01-26 | 1952-11-04 | 0 | Details |
| US2616973A | Combined radio and intercommunication system | Expired / Lapsed | 1948-10-19 | 1952-11-04 | 0 | Details |
| US2617036A | Frequency divider | Expired / Lapsed | 1948-04-30 | 1952-11-04 | 0 | Details |
| US2617022A | Mixing detector circuit arrangement | Expired / Lapsed | 1948-01-21 | 1952-11-04 | 0 | Details |
| US2616169A | Cutting plate of dry-shaving devices | Expired / Lapsed | 1946-05-03 | 1952-11-04 | 0 | Details |
| US2611083A | Superheterodyne receiver | Expired / Lapsed | 1949-10-07 | 1952-09-16 | 0 | Details |
| US2611039A | Apparatus including a titanate condenser for amplifying an … | Expired / Lapsed | 1947-05-03 | 1952-09-16 | 0 | Details |
| US2606283A | Mixing circuit arrangement | Expired / Lapsed | 1946-09-10 | 1952-08-05 | 0 | Details |
| US2605425A | Device for synchronizing two oscillations | Expired / Lapsed | 1946-11-22 | 1952-07-29 | 0 | Details |
| US2601416A | Tube generator | Expired / Lapsed | 1949-02-15 | 1952-06-24 | 0 | Details |
| US2600288A | Frequency stabilizing apparatus | Expired / Lapsed | 1946-04-10 | 1952-06-10 | 0 | Details |
| US2596016A | Switching device for phonographs | Expired / Lapsed | 1947-10-08 | 1952-05-06 | 0 | Details |
| US2596048A | Device for vibration testing | Expired / Lapsed | 1946-05-04 | 1952-05-06 | 0 | Details |
| US2595931A | Superheterodyne receiver with automatic frequency control | Expired / Lapsed | 1946-04-18 | 1952-05-06 | 0 | Details |
| US2596057A | Method and apparatus for temporarily increasing the power o… | Expired / Lapsed | 1945-09-04 | 1952-05-06 | 0 | Details |
| US2591980A | Adjustable impedance transformer | Expired / Lapsed | 1948-10-12 | 1952-04-08 | 0 | Details |
| US2591981A | Circuit arrangement, including a cathode-ray tube comprisin… | Expired / Lapsed | 1947-12-10 | 1952-04-08 | 0 | Details |
| US2591936A | Transmission network for emphasizing the high-frequencies o… | Expired / Lapsed | 1947-02-12 | 1952-04-08 | 0 | Details |
| US2591982A | Superheterodyne receiver for very short waves | Expired / Lapsed | 1946-07-20 | 1952-04-08 | 0 | Details |
| US2589387A | Device for automatic frequency-correction | Expired / Lapsed | 1947-12-02 | 1952-03-18 | 0 | Details |
| US2582697A | Blocking oscillator | Expired / Lapsed | 1948-04-07 | 1952-01-15 | 0 | Details |
| US2579706A | Cutting plate for dry-shaving apparatus | Expired / Lapsed | 1948-04-17 | 1951-12-25 | 0 | Details |
| US2577483A | Self-compensating measuring bridge circuit having automatic… | Expired / Lapsed | 1947-02-01 | 1951-12-04 | 0 | Details |
| US2573447A | Circuit arrangement for generating phase modulated oscillat… | Expired / Lapsed | 1947-01-11 | 1951-10-30 | 0 | Details |
| US2571026A | Resonant circuit for ultrashort waves | Expired / Lapsed | 1947-02-05 | 1951-10-09 | 0 | Details |
| US2570010A | Multiplex transceiving arrangement | Expired / Lapsed | 1948-02-18 | 1951-10-02 | 0 | Details |
| US2569358A | Apparatus for phase modulating high-frequency oscillations | Expired / Lapsed | 1948-03-10 | 1951-09-25 | 0 | Details |
| US2567656A | Translucent projection screen for viewing from two differen… | Expired / Lapsed | 1948-08-04 | 1951-09-11 | 0 | Details |
| US2567286A | Device for automatic frequency correction | Expired / Lapsed | 1947-12-02 | 1951-09-11 | 0 | Details |
| US2565231A | Variable artificial transmission line for effecting phase m… | Expired / Lapsed | 1947-12-19 | 1951-08-21 | 0 | Details |
| US2561073A | Counting relay system | Expired / Lapsed | 1949-02-12 | 1951-07-17 | 0 | Details |
| US2557774A | Electron discharge tube | Expired / Lapsed | 1949-07-28 | 1951-06-19 | 0 | Details |
| US2556070A | Control circuit arrangement | Expired / Lapsed | 1946-04-08 | 1951-06-05 | 0 | Details |
| US2554087A | High-frequency oscillator with a back-coupled electron tube | Expired / Lapsed | 1948-01-23 | 1951-05-22 | 0 | Details |
| US2552464A | Color television | Expired / Lapsed | 1948-05-07 | 1951-05-08 | 0 | Details |
| US2551828A | Radio beacon | Expired / Lapsed | 1947-02-11 | 1951-05-08 | 0 | Details |
| US2547447A | Apparatus for stereophonic sound reproduction | Expired / Lapsed | 1945-09-24 | 1951-04-03 | 0 | Details |
| US2546239A | Method of preparing zinc sulfide phosphor | Expired / Lapsed | 1947-12-06 | 1951-03-27 | 2 | Details |
| US2543248A | Device for the medical treatment of persons with high-frequ… | Expired / Lapsed | 1946-07-15 | 1951-02-27 | 0 | Details |
| US2541384A | Method of making a luminescent zinc sulfide | Expired / Lapsed | 1947-12-06 | 1951-02-13 | 2 | Details |
| US2541649A | Circuit arrangement for the frequency modulation of a carri… | Expired / Lapsed | 1946-04-27 | 1951-02-13 | 0 | Details |
| US2541749A | Variable condenser with fixed electrodes | Expired / Lapsed | 1946-04-20 | 1951-02-13 | 0 | Details |
| US2540333A | Device for automatic frequency correction | Expired / Lapsed | 1947-12-23 | 1951-02-06 | 0 | Details |
| US2539971A | Oscillographic voltage measuring device | Expired / Lapsed | 1947-02-12 | 1951-01-30 | 0 | Details |
| US2538869A | Stereophonic sound | Expired / Lapsed | 1947-03-25 | 1951-01-23 | 0 | Details |
| US2537383A | Device for extinguishing a discharge tube having a mercury … | Expired / Lapsed | 1946-04-19 | 1951-01-09 | 0 | Details |
| US2536271A | Device for the medical treatment of persons with high-frequ… | Expired / Lapsed | 1946-10-18 | 1951-01-02 | 0 | Details |
| US2532738A | Arrangement comprising a cathoderay tube having means for d… | Expired / Lapsed | 1949-02-17 | 1950-12-05 | 0 | Details |
| US2532747A | Circuit arrangement comprising a cathode-ray tube | Expired / Lapsed | 1949-02-11 | 1950-12-05 | 0 | Details |
| US2531845A | Wireless receiver comprising automatic gain control | Expired / Lapsed | 1947-02-07 | 1950-11-28 | 0 | Details |
| US2530614A | Transmitter and receiver for single-sideband signals | Expired / Lapsed | 1946-07-20 | 1950-11-21 | 0 | Details |
| US2531301A | Circuit arrangement for frequency controls | Expired / Lapsed | 1946-06-07 | 1950-11-21 | 0 | Details |
| US2530101A | Low-frequency amplifying circuits with negative feedback | Expired / Lapsed | 1946-05-10 | 1950-11-14 | 0 | Details |
| US2527462A | Saw-tooth oscillation generator | Expired / Lapsed | 1945-10-19 | 1950-10-24 | 0 | Details |
| US2526426A | Circuit arrangement for amplifying electrical signals | Expired / Lapsed | 1948-01-16 | 1950-10-17 | 0 | Details |
| US2525554A | Attenuator for high-frequency electric signaling systems | Expired / Lapsed | 1944-12-22 | 1950-10-10 | 0 | Details |
| US2524610A | Radiant energy method and apparatus for measuring the veloc… | Expired / Lapsed | 1945-09-10 | 1950-10-03 | 0 | Details |
| US2515931A | Electric discharge tube | Expired / Lapsed | 1948-08-04 | 1950-07-18 | 0 | Details |
| US2515599A | Arrangement coupling either of two electrical devices to a … | Expired / Lapsed | 1948-01-16 | 1950-07-18 | 0 | Details |
| US2512162A | Electrical apparatus comprising a wiring cast by extrusion | Expired / Lapsed | 1947-05-02 | 1950-06-20 | 0 | Details |
| US2508538A | Multiples pulse distributing system | Expired / Lapsed | 1946-11-22 | 1950-05-23 | 0 | Details |
| US2507160A | Diversity receiving system | Expired / Lapsed | 1947-02-11 | 1950-05-09 | 0 | Details |
| US2507176A | Receiver for pulse modulated waves | Expired / Lapsed | 1946-05-01 | 1950-05-09 | 0 | Details |
| US2505655A | Transmitting-receiving circuit arrangement for short waves | Expired / Lapsed | 1946-07-20 | 1950-04-25 | 0 | Details |
| US2505692A | Dual range frequency-modulated radio altimeter | Expired / Lapsed | 1946-05-09 | 1950-04-25 | 0 | Details |
| US2505251A | Superheterodyne receiver for very short waves | Expired / Lapsed | 1946-05-09 | 1950-04-25 | 0 | Details |
| US2504603A | Resistance capacitance oscillator | Expired / Lapsed | 1946-11-21 | 1950-04-18 | 0 | Details |
| US2500605A | Method and device for manufacturing electric resistance bod… | Expired / Lapsed | 1946-11-27 | 1950-03-14 | 0 | Details |
| US2500863A | Circuit for converting a voltage of given shape into a volt… | Expired / Lapsed | 1946-11-22 | 1950-03-14 | 0 | Details |
| US2499423A | Telephone transmission circuits for coupling input and outp… | Expired / Lapsed | 1946-03-06 | 1950-03-07 | 0 | Details |
| US2497755A | X-ray tube with movable directing cone | Expired / Lapsed | 1946-05-10 | 1950-02-14 | 0 | Details |
| US2496346A | Semiconductive resistance provided with metal contacts | Expired / Lapsed | 1947-02-07 | 1950-02-07 | 2 | Details |
| US2496861A | Pickup provided with a member for protecting the scanning n… | Expired / Lapsed | 1946-05-09 | 1950-02-07 | 0 | Details |
| US2494241A | Circuit arrangement producing a direct voltage for supplyin… | Expired / Lapsed | 1947-04-14 | 1950-01-10 | 0 | Details |
| US2493951A | Process of hardening alloys by indiffusion of a metalloid | Expired / Lapsed | 1946-05-03 | 1950-01-10 | 2 | Details |
| US2491922A | Circuit arrangement for stabilizing a frequency-modulated o… | Expired / Lapsed | 1948-02-07 | 1949-12-20 | 0 | Details |
| US2491921A | Stabilizing circuit for frequency-modulated oscillators | Expired / Lapsed | 1946-04-26 | 1949-12-20 | 0 | Details |
| US2490727A | Direct-current voltage amplifier | Expired / Lapsed | 1947-12-06 | 1949-12-06 | 0 | Details |
| US2488452A | Circuit arrangement for deflecting the cathode-ray beams in… | Expired / Lapsed | 1947-11-25 | 1949-11-15 | 0 | Details |
| US2486656A | Permanent magnet generator system | Expired / Lapsed | 1946-04-25 | 1949-11-01 | 0 | Details |
| US2485829A | Apparatus for and method of electrooptically scanning and r… | Expired / Lapsed | 1946-05-03 | 1949-10-25 | 0 | Details |
| US2486110A | Combination of two or more than two blocking-layer cells | Expired / Lapsed | 1945-09-24 | 1949-10-25 | 0 | Details |
| US2485365A | Method of direction finding by means of rotating radio beac… | Expired / Lapsed | 1947-02-11 | 1949-10-18 | 0 | Details |
| US2483147A | Photographic preproduction and projection device for cathod… | Expired / Lapsed | 1946-07-20 | 1949-09-27 | 0 | Details |
| US2483189A | Transmission line oscillator | Expired / Lapsed | 1945-11-28 | 1949-09-27 | 0 | Details |
| US2481562A | Electric filter | Expired / Lapsed | 1945-08-23 | 1949-09-13 | 0 | Details |
| US2480060A | Device comprising a gaseous discharge tube | Expired / Lapsed | 1947-03-11 | 1949-08-23 | 0 | Details |
| US2478021A | High-frequency amplifying circuit arrangement | Expired / Lapsed | 1946-05-01 | 1949-08-02 | 0 | Details |
| US2476349A | Phase or frequency modulation system | Expired / Lapsed | 1945-11-07 | 1949-07-19 | 0 | Details |
| US2471168A | Device for converting a signal of variable amplitude into p… | Expired / Lapsed | 1946-11-22 | 1949-05-24 | 0 | Details |
| US2470352A | Electrical resistor | Expired / Lapsed | 1945-07-20 | 1949-05-17 | 0 | Details |
| US2469852A | Method of operating photoelectric devices | Expired / Lapsed | 1946-07-16 | 1949-05-10 | 0 | Details |
| US2467775A | Device for detecting pulses modulated by a signal to be rep… | Expired / Lapsed | 1946-11-22 | 1949-04-19 | 0 | Details |
| US2466590A | Circuit arrangement adapted to visualize direct voltages on… | Expired / Lapsed | 1947-03-03 | 1949-04-05 | 0 | Details |
| US2465768A | Blocking-layer cell | Expired / Lapsed | 1945-09-18 | 1949-03-29 | 0 | Details |
| US2464066A | Method of reducing the leakage current in selenium rectifie… | Expired / Lapsed | 1945-08-29 | 1949-03-08 | 0 | Details |
| US2462949A | Method of treating selenium | Expired / Lapsed | 1946-04-09 | 1949-03-01 | 0 | Details |
| US2456763A | Frequency stabilization | Expired / Lapsed | 1943-05-26 | 1948-12-21 | 0 | Details |
| US2455959A | Device for the transmission of signals by means of frequenc… | Expired / Lapsed | 1943-03-24 | 1948-12-14 | 0 | Details |
| US2453078A | Device for wave length transformation of very short waves | Expired / Lapsed | 1943-03-17 | 1948-11-02 | 0 | Details |
| US2452530A | Magnetic core | Expired / Lapsed | 1945-09-19 | 1948-10-26 | 0 | Details |
| US2452531A | Process of manufacturing a magnetic material and magnetic c… | Expired / Lapsed | 1945-09-19 | 1948-10-26 | 0 | Details |
| US2452529A | Magnet core | Expired / Lapsed | 1945-09-17 | 1948-10-26 | 0 | Details |
| US2450602A | Thermionic discharge tube with electronic velocity filter | Expired / Lapsed | 1944-08-17 | 1948-10-05 | 0 | Details |
| US2446706A | Plug and socket joint suitable for electrical conductors ca… | Expired / Lapsed | 1944-07-10 | 1948-08-10 | 0 | Details |
| US2444388A | Device for indicating direction and distance | Expired / Lapsed | 1938-12-29 | 1948-06-29 | 0 | Details |
| US2441452A | Frequency changing circuits | Expired / Lapsed | 1943-03-23 | 1948-05-11 | 0 | Details |
| US2438761A | Manufacture of ceramic materials of high permittivity | Expired / Lapsed | 1945-10-03 | 1948-03-30 | 0 | Details |
| US2436908A | Flexible connecting rod | Expired / Lapsed | 1945-09-04 | 1948-03-02 | 0 | Details |
| US2437047A | Phase modulation | Expired / Lapsed | 1943-12-23 | 1948-03-02 | 0 | Details |
| US2434474A | Circuit arrangement for ultra short waves | Expired / Lapsed | 1943-03-23 | 1948-01-13 | 0 | Details |
| US2434236A | Ceramic insulator | Expired / Lapsed | 1943-01-18 | 1948-01-06 | 0 | Details |
| US2430904A | Rectifying installation comprising blocking-layer cells | Expired / Lapsed | 1943-01-11 | 1947-11-18 | 0 | Details |
| US2429504A | Frequency modulation network | Expired / Lapsed | 1943-11-09 | 1947-10-21 | 0 | Details |
| US2428400A | Blocking-layer cells comprising one or more grids embedded … | Expired / Lapsed | 1943-01-18 | 1947-10-07 | 0 | Details |
| US2425981A | Balanced frequency discriminator | Expired / Lapsed | 1943-10-27 | 1947-08-19 | 0 | Details |
| US2417188A | Variable inductance | Expired / Lapsed | 1944-07-13 | 1947-03-11 | 0 | Details |
| US2417296A | Low-frequency amplifier circuits | Expired / Lapsed | 1943-03-23 | 1947-03-11 | 0 | Details |
| US2407863A | Reception of frequency modulated waves | Expired / Lapsed | 1943-04-12 | 1946-09-17 | 0 | Details |
| US2406125A | Frequency stabilizing system | Expired / Lapsed | 1943-12-17 | 1946-08-20 | 0 | Details |
| US2406309A | Frequency stabilization | Expired / Lapsed | 1942-11-03 | 1946-08-20 | 0 | Details |
| US2405771A | Method of synchronizing a plurality of oscillations | Expired / Lapsed | 1942-07-11 | 1946-08-13 | 0 | Details |
| US2397435A | Tuning mechanism for wireless sets | Expired / Lapsed | 1944-07-12 | 1946-03-26 | 0 | Details |
| US2391862A | Electrical circuit arrangement | Expired / Lapsed | 1942-10-01 | 1946-01-01 | 0 | Details |
| US2385086A | Modulation of electrical quantities | Expired / Lapsed | 1943-04-19 | 1945-09-18 | 0 | Details |
| US2385085A | Method of producing frequency modulated waves for radio tra… | Expired / Lapsed | 1942-07-11 | 1945-09-18 | 0 | Details |
| US2381754A | Frequency modulation receiver | Expired / Lapsed | 1944-05-26 | 1945-08-07 | 0 | Details |
| US2381227A | Tuning arrangement for wireless receivers | Expired / Lapsed | 1944-02-07 | 1945-08-07 | 0 | Details |
| US2379395A | Fm transceiver | Expired / Lapsed | 1944-05-05 | 1945-06-26 | 0 | Details |
| US2372210A | Method of generating frequency modulated waves | Expired / Lapsed | 1942-03-26 | 1945-03-27 | 0 | Details |
| US2365601A | Electronic indicating device | Expired / Lapsed | 1944-01-10 | 1944-12-19 | 0 | Details |
| US2347977A | Radio receiver | Expired / Lapsed | 1942-05-25 | 1944-05-02 | 0 | Details |
| US2346522A | Fluorescent lamp | Expired / Lapsed | 1942-05-12 | 1944-04-11 | 0 | Details |
| US2337391A | Haircutting device | Expired / Lapsed | 1940-03-05 | 1943-12-21 | 0 | Details |
| US2336138A | Vaporization of metals | Expired / Lapsed | 1942-11-10 | 1943-12-07 | 0 | Details |
| US2330950A | Ceramic insulator and method of making the same | Expired / Lapsed | 1940-02-28 | 1943-10-05 | 0 | Details |
| US2326584A | Multiplex telephony system | Expired / Lapsed | 1940-02-28 | 1943-08-10 | 0 | Details |
| US2321439A | Method of making vitreous coated bodies | Expired / Lapsed | 1937-08-19 | 1943-06-08 | 0 | Details |
| US2308920A | Hair cutting device | Expired / Lapsed | 1940-02-23 | 1943-01-19 | 0 | Details |
| US2303456A | Method of mixing sound records | Expired / Lapsed | 1940-01-08 | 1942-12-01 | 0 | Details |
| US2302087A | Blocking-layer rectifier | Expired / Lapsed | 1939-11-13 | 1942-11-17 | 0 | Details |
| US2288341A | Blocking layer electrode system | Expired / Lapsed | 1940-06-12 | 1942-06-30 | 0 | Details |
| US2277581A | Arrangement for controlling two or more electric vapor or g… | Expired / Lapsed | 1940-05-01 | 1942-03-24 | 0 | Details |
| US2273866A | Stereophonic sound recording and reproduction | Expired / Lapsed | 1938-09-27 | 1942-02-24 | 0 | Details |
| US2266671A | Cathode ray tube multiplex telephony system | Expired / Lapsed | 1939-04-20 | 1941-12-16 | 0 | Details |
| US2265203A | Telephony | Expired / Lapsed | 1939-04-26 | 1941-12-09 | 0 | Details |
| US2265216A | Multiplex telephony system | Expired / Lapsed | 1939-04-20 | 1941-12-09 | 0 | Details |
| US2263369A | Multiplex telephony system | Expired / Lapsed | 1940-01-08 | 1941-11-18 | 0 | Details |
| US2250496A | Pressure measuring device | Expired / Lapsed | 1938-06-16 | 1941-07-29 | 0 | Details |
| US2244664A | Method of building up stratified electrode systems | Expired / Lapsed | 1939-11-14 | 1941-06-10 | 0 | Details |
| US2227353A | Voltage regulation | Expired / Lapsed | 1939-01-14 | 1940-12-31 | 0 | Details |
| US2220887A | Electrolytic condenser | Expired / Lapsed | 1938-02-10 | 1940-11-12 | 0 | Details |
| US2220126A | Inductance coil | Expired / Lapsed | 1938-01-08 | 1940-11-05 | 0 | Details |
| US2217539A | Torsion meter | Expired / Lapsed | 1938-06-27 | 1940-10-08 | 0 | Details |
| US2215482A | Carrier wave telephony | Expired / Lapsed | 1938-12-17 | 1940-09-24 | 0 | Details |
| US2213209A | Electrolytic condenser | Expired / Lapsed | 1939-04-26 | 1940-09-03 | 0 | Details |
| US2213199A | Voltage multiplier | Expired / Lapsed | 1938-05-25 | 1940-09-03 | 0 | Details |
| US2210956A | Coupling circuit | Expired / Lapsed | 1937-11-22 | 1940-08-13 | 0 | Details |
| US2209971A | Sound record | Expired / Lapsed | 1939-01-04 | 1940-08-06 | 0 | Details |