Weston Electric Instrument Corp
Weston EleActive Patents
0
Total Holdings
63
Patent Holdings
Filter in Explorer →| Patent No. | Title | Status | Filing Date | Grant Date | Claims | Actions |
|---|---|---|---|---|---|---|
| US2766428A | Capacitance measuring circuit | Expired / Lapsed | 1954-09-09 | 1956-10-09 | 0 | Details |
| US2755704A | Photographic exposure-determining apparatus | Expired / Lapsed | 1952-09-18 | 1956-07-24 | 0 | Details |
| US2744168A | D. c. amplifier | Expired / Lapsed | 1952-01-21 | 1956-05-01 | 0 | Details |
| US2713625A | Humidity-sensitive element | Expired / Lapsed | 1953-04-29 | 1955-07-19 | 0 | Details |
| US2697803A | Relay system | Expired / Lapsed | 1951-08-21 | 1954-12-21 | 0 | Details |
| US2694930A | Temperature measuring apparatus | Expired / Lapsed | 1950-06-22 | 1954-11-23 | 0 | Details |
| US2680221A | Damping generator for slide wire potentiometers | Expired / Lapsed | 1951-02-19 | 1954-06-01 | 0 | Details |
| US2679758A | Thermometer | Expired / Lapsed | 1950-09-08 | 1954-06-01 | 0 | Details |
| US2673327A | Mositure testing apparatus | Expired / Lapsed | 1952-03-15 | 1954-03-23 | 0 | Details |
| US2663846A | Integrating direct current wattmeter | Expired / Lapsed | 1949-08-05 | 1953-12-22 | 0 | Details |
| US2651203A | Temperature indicator | Expired / Lapsed | 1950-10-03 | 1953-09-08 | 0 | Details |
| US2648983A | Electrical thermometer for measuring high temperatures | Expired / Lapsed | 1950-03-10 | 1953-08-18 | 0 | Details |
| US2640089A | Thermocouple cold-end compensator | Expired / Lapsed | 1950-01-06 | 1953-05-26 | 0 | Details |
| US2636600A | Thermometer package | Expired / Lapsed | 1950-05-22 | 1953-04-28 | 0 | Details |
| US2575951A | Integrating apparatus | Expired / Lapsed | 1946-12-10 | 1951-11-20 | 0 | Details |
| US2550990A | Direct current amplifier | Expired / Lapsed | 1946-04-08 | 1951-05-01 | 0 | Details |
| US2538618A | Pressure fluid servomotor with light responsive follow-up m… | Expired / Lapsed | 1944-02-25 | 1951-01-16 | 0 | Details |
| US2507803A | Multiple tester with corner transformer | Expired / Lapsed | 1946-08-19 | 1950-05-16 | 0 | Details |
| US2495531A | Instrument panel assembly | Expired / Lapsed | 1945-11-09 | 1950-01-24 | 0 | Details |
| US2478966A | Dual purpose voltmeter range attenuator | Expired / Lapsed | 1948-03-29 | 1949-08-16 | 0 | Details |
| US2463984A | Flush type resistor element for temperature measurements | Expired / Lapsed | 1946-03-18 | 1949-03-08 | 0 | Details |
| US2462823A | Photoelectric cell color temperature measuring device | Expired / Lapsed | 1945-05-31 | 1949-02-22 | 0 | Details |
| US2449304A | Supervisory electrical alarm system | Expired / Lapsed | 1946-05-16 | 1948-09-14 | 0 | Details |
| US2433566A | Process for manufacturing photoelectric cells of the dry di… | Expired / Lapsed | 1942-07-22 | 1947-12-30 | 0 | Details |
| US2425250A | Encased electrical device | Expired / Lapsed | 1945-01-31 | 1947-08-05 | 0 | Details |
| US2403521A | Electronic microammeter | Expired / Lapsed | 1943-08-20 | 1946-07-09 | 0 | Details |
| US2379530A | Resistance element | Expired / Lapsed | 1941-09-30 | 1945-07-03 | 0 | Details |
| US2373079A | Apparatus for testing condensers | Expired / Lapsed | 1940-10-21 | 1945-04-03 | 0 | Details |
| US2324262A | Magnetic contact | Expired / Lapsed | 1941-03-01 | 1943-07-13 | 0 | Details |
| US2305576A | Multiple unit photocell | Expired / Lapsed | 1941-05-03 | 1942-12-15 | 0 | Details |
| US2288294A | Ultra high frequency oscillator | Expired / Lapsed | 1939-10-18 | 1942-06-30 | 0 | Details |
| US2286036A | Integrating photometer | Expired / Lapsed | 1940-01-10 | 1942-06-09 | 0 | Details |
| US2274441A | Exposure meter | Expired / Lapsed | 1939-01-14 | 1942-02-24 | 0 | Details |
| US2244264A | Photoelectric cell | Expired / Lapsed | 1937-09-27 | 1941-06-03 | 0 | Details |
| US2239362A | Thermionic tube amplifier | Expired / Lapsed | 1937-08-10 | 1941-04-22 | 0 | Details |
| US2208329A | Vacuum tube voltmeter | Expired / Lapsed | 1937-05-07 | 1940-07-16 | 0 | Details |
| US2198371A | Power factor indicator | Expired / Lapsed | 1938-08-09 | 1940-04-23 | 0 | Details |
| US2149448A | Resistance element | Expired / Lapsed | 1936-04-20 | 1939-03-07 | 0 | Details |
| US2145147A | Photoelectric measuring apparatus | Expired / Lapsed | 1934-09-22 | 1939-01-24 | 0 | Details |
| US2136682A | Automatic control system | Expired / Lapsed | 1936-01-08 | 1938-11-15 | 0 | Details |
| US2131028A | Photoelectric control system | Expired / Lapsed | 1937-04-09 | 1938-09-27 | 0 | Details |
| US2127977A | Thermionic relay circuits | Expired / Lapsed | 1935-09-07 | 1938-08-23 | 0 | Details |
| US2123470A | Control device | Expired / Lapsed | 1934-05-10 | 1938-07-12 | 0 | Details |
| US2073790A | Photographic exposure meter | Expired / Lapsed | 1932-10-21 | 1937-03-16 | 0 | Details |
| US2062915A | Control device | Expired / Lapsed | 1935-02-16 | 1936-12-01 | 0 | Details |
| US2057384A | Relay circuit | Expired / Lapsed | 1932-07-07 | 1936-10-13 | 0 | Details |
| US2043904A | Electrical control board | Expired / Lapsed | 1932-06-14 | 1936-06-09 | 0 | Details |
| US2042109A | Electrical relay | Expired / Lapsed | 1933-11-17 | 1936-05-26 | 0 | Details |
| US2039230A | Illumination control device | Expired / Lapsed | 1934-05-10 | 1936-04-28 | 0 | Details |
| US2032010A | Photoelectric cell circuit | Expired / Lapsed | 1933-06-23 | 1936-02-25 | 0 | Details |
| US2015316A | Radio set tester | Expired / Lapsed | 1933-10-23 | 1935-09-24 | 0 | Details |
| US2014385A | Electrical control device | Expired / Lapsed | 1933-09-08 | 1935-09-17 | 0 | Details |
| US2014386A | Sensitive control device | Expired / Lapsed | 1933-09-08 | 1935-09-17 | 0 | Details |
| US2000642A | Photoelectric device | Expired / Lapsed | 1932-07-14 | 1935-05-07 | 0 | Details |
| US1984493A | Electrical testing apparatus | Expired / Lapsed | 1931-06-01 | 1934-12-18 | 0 | Details |
| US1951799A | Ammeter | Expired / Lapsed | 1932-07-06 | 1934-03-20 | 0 | Details |
| US1949689A | Relay system | Expired / Lapsed | 1932-05-07 | 1934-03-06 | 0 | Details |
| US1896193A | Constant resistivity alloy | Expired / Lapsed | 1930-10-14 | 1933-02-07 | 0 | Details |
| US1879349A | Relay contact | Expired / Lapsed | 1930-04-03 | 1932-09-27 | 0 | Details |
| US1714651A | Testing apparatus | Expired / Lapsed | 1925-06-24 | 1929-05-28 | 0 | Details |
| US1661214A | Zero corrector | Expired / Lapsed | 1926-11-06 | 1928-03-06 | 0 | Details |
| US1630592A | Electrical measuring instrument | Expired / Lapsed | 1925-11-02 | 1927-05-31 | 0 | Details |
| US1523803A | Ground detector | Expired / Lapsed | 1920-08-10 | 1925-01-20 | 0 | Details |