Hartford National Bank and Trust Co
Hartford NActive Patents
0
Total Holdings
131
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 |
| 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 |
| US2768293A | Frequency-modulated oscillator with automatic frequency cor… | Expired / Lapsed | 1951-03-23 | 1956-10-23 | 0 | Details |
| US2760002A | Time-multiplex pulse modulation communication system | Expired / Lapsed | 1950-10-14 | 1956-08-21 | 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 |
| 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 |
| US2744959A | Pulse-code modulation transmitter | Expired / Lapsed | 1951-04-14 | 1956-05-08 | 0 | 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 |
| US2722617A | Magnetic circuits and devices | Expired / Lapsed | 1952-11-19 | 1955-11-01 | 0 | 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 |
| 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 |
| US2676210A | Potential comparing selector circuit | Expired / Lapsed | 1949-07-28 | 1954-04-20 | 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 |
| US2662170A | Radio receiving circuit with automatic volume control and n… | Expired / Lapsed | 1949-07-26 | 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 |
| US2662113A | Pulse-code modulation communication system | Expired / Lapsed | 1949-02-10 | 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 |
| US2650340A | Arrangement for converting direct voltages into alternating… | Expired / Lapsed | 1949-04-29 | 1953-08-25 | 0 | Details |
| US2640883A | Marker control arrangement for selectors | Expired / Lapsed | 1949-07-29 | 1953-06-02 | 0 | 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 |
| US2617036A | Frequency divider | Expired / Lapsed | 1948-04-30 | 1952-11-04 | 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 |
| US2596048A | Device for vibration testing | Expired / Lapsed | 1946-05-04 | 1952-05-06 | 0 | Details |
| US2591980A | Adjustable impedance transformer | Expired / Lapsed | 1948-10-12 | 1952-04-08 | 0 | Details |
| US2589387A | Device for automatic frequency-correction | Expired / Lapsed | 1947-12-02 | 1952-03-18 | 0 | Details |
| US2577483A | Self-compensating measuring bridge circuit having automatic… | Expired / Lapsed | 1947-02-01 | 1951-12-04 | 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 |
| US2565231A | Variable artificial transmission line for effecting phase m… | Expired / Lapsed | 1947-12-19 | 1951-08-21 | 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 |
| 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 |
| US2543248A | Device for the medical treatment of persons with high-frequ… | Expired / Lapsed | 1946-07-15 | 1951-02-27 | 0 | Details |
| US2541649A | Circuit arrangement for the frequency modulation of a carri… | Expired / Lapsed | 1946-04-27 | 1951-02-13 | 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 |
| US2532747A | Circuit arrangement comprising a cathode-ray tube | Expired / Lapsed | 1949-02-11 | 1950-12-05 | 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 |
| US2525554A | Attenuator for high-frequency electric signaling systems | Expired / Lapsed | 1944-12-22 | 1950-10-10 | 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 |
| 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 |
| US2505251A | Superheterodyne receiver for very short waves | Expired / Lapsed | 1946-05-09 | 1950-04-25 | 0 | Details |
| US2505692A | Dual range frequency-modulated radio altimeter | Expired / Lapsed | 1946-05-09 | 1950-04-25 | 0 | Details |
| US2499423A | Telephone transmission circuits for coupling input and outp… | Expired / Lapsed | 1946-03-06 | 1950-03-07 | 0 | Details |
| US2496346A | Semiconductive resistance provided with metal contacts | Expired / Lapsed | 1947-02-07 | 1950-02-07 | 2 | Details |
| US2494241A | Circuit arrangement producing a direct voltage for supplyin… | Expired / Lapsed | 1947-04-14 | 1950-01-10 | 0 | 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 |
| US2486656A | Permanent magnet generator system | Expired / Lapsed | 1946-04-25 | 1949-11-01 | 0 | Details |
| US2486110A | Combination of two or more than two blocking-layer cells | Expired / Lapsed | 1945-09-24 | 1949-10-25 | 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 |
| 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 |
| US2467775A | Device for detecting pulses modulated by a signal to be rep… | Expired / Lapsed | 1946-11-22 | 1949-04-19 | 0 | Details |
| US2464066A | Method of reducing the leakage current in selenium rectifie… | Expired / Lapsed | 1945-08-29 | 1949-03-08 | 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 |
| US2452531A | Process of manufacturing a magnetic material and magnetic c… | Expired / Lapsed | 1945-09-19 | 1948-10-26 | 0 | Details |
| US2452530A | Magnetic core | 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 |
| US2441452A | Frequency changing circuits | Expired / Lapsed | 1943-03-23 | 1948-05-11 | 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 |
| 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 |
| 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 |
| US2385086A | Modulation of electrical quantities | Expired / Lapsed | 1943-04-19 | 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 |
| 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 |
| US2302087A | Blocking-layer rectifier | Expired / Lapsed | 1939-11-13 | 1942-11-17 | 0 | Details |
| US2277581A | Arrangement for controlling two or more electric vapor or g… | Expired / Lapsed | 1940-05-01 | 1942-03-24 | 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 |
| US2220887A | Electrolytic condenser | Expired / Lapsed | 1938-02-10 | 1940-11-12 | 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 |