American District Telegraph Co
American DActive Patents
0
Total Holdings
31
Patent Holdings
Filter in Explorer →| Patent No. | Title | Status | Filing Date | Grant Date | Claims | Actions |
|---|---|---|---|---|---|---|
| US4195286A | Alarm system having improved false alarm rate and detection… | Expired / Lapsed | 1978-01-06 | 1980-03-25 | 7 | Details |
| US3518654A | Method and apparatus for detecting a condition | Expired / Lapsed | 1967-05-16 | 1970-06-30 | 0 | Details |
| US3444544A | Light modulated intrusion detection system | Expired / Lapsed | 1965-07-19 | 1969-05-13 | 0 | Details |
| US3260991A | Apparatus for detecting motion and objects | Expired / Lapsed | 1963-03-20 | 1966-07-12 | 2 | Details |
| US3214734A | Protection signalling system having channel impedance alter… | Expired / Lapsed | 1959-06-19 | 1965-10-26 | 2 | Details |
| US3134970A | Alarm system | Expired / Lapsed | 1961-05-31 | 1964-05-26 | 2 | Details |
| US3010100A | Direct current operated burglar alarm system with alternati… | Expired / Lapsed | 1958-06-30 | 1961-11-21 | 0 | Details |
| US2985871A | Electric protection system | Expired / Lapsed | 1958-09-17 | 1961-05-23 | 0 | Details |
| US2983912A | Signalling circuit | Expired / Lapsed | 1959-06-18 | 1961-05-09 | 0 | Details |
| US2912540A | Defeat resistant burglar alarm contact | Expired / Lapsed | 1958-02-13 | 1959-11-10 | 0 | Details |
| US2678433A | Fire alarm system | Expired / Lapsed | 1950-07-20 | 1954-05-11 | 0 | Details |
| US2398594A | Signaling system | Expired / Lapsed | 1944-12-16 | 1946-04-16 | 0 | Details |
| US2390221A | Alarm system | Expired / Lapsed | 1943-07-03 | 1945-12-04 | 0 | Details |
| US2343987A | Alarm system | Expired / Lapsed | 1940-04-19 | 1944-03-14 | 0 | Details |
| US2332154A | Radiant energy alarm system | Expired / Lapsed | 1940-07-27 | 1943-10-19 | 0 | Details |
| US2311374A | Automatic fire control system for ventilating or air condit… | Expired / Lapsed | 1938-11-01 | 1943-02-16 | 0 | Details |
| US2298840A | Alarm system | Expired / Lapsed | 1938-03-04 | 1942-10-13 | 0 | Details |
| US2289517A | Radio alarm system | Expired / Lapsed | 1938-09-30 | 1942-07-14 | 0 | Details |
| US2278936A | Radiant energy receiving system | Expired / Lapsed | 1939-04-25 | 1942-04-07 | 0 | Details |
| US2247246A | Micro-wave radio alarm system | Expired / Lapsed | 1938-12-03 | 1941-06-24 | 0 | Details |
| US2227147A | Photoelectric burglar alarm system | Expired / Lapsed | 1938-03-24 | 1940-12-31 | 0 | Details |
| US2220371A | Electrical signaling system | Expired / Lapsed | 1937-10-09 | 1940-11-05 | 0 | Details |
| US2172511A | Printing recorder for electric impulse signal systems | Expired / Lapsed | 1931-01-10 | 1939-09-12 | 0 | Details |
| US2116462A | Automatic electric signal circuit | Expired / Lapsed | 1931-05-22 | 1938-05-03 | 0 | Details |
| US2007371A | Nonaccumulative bandit alarm retard device | Expired / Lapsed | 1932-02-24 | 1935-07-09 | 0 | Details |
| US1942814A | Delinquency indicator of flyback type | Expired / Lapsed | 1930-06-21 | 1934-01-09 | 0 | Details |
| US1829721A | Alarm system and cumulative control device therefor | Expired / Lapsed | 1927-10-31 | 1931-10-27 | 0 | Details |
| US1547873A | Signaling system | Expired / Lapsed | 1918-03-13 | 1925-07-28 | 0 | Details |
| US1349961A | Signaling system | Expired / Lapsed | 1916-10-20 | 1920-08-17 | 0 | Details |
| US1331151A | Recording system and apparatus | Expired / Lapsed | 1917-01-27 | 1920-02-17 | 0 | Details |
| US1192312A | Burglar or detection system. | Expired / Lapsed | 1915-12-06 | 1916-07-25 | 0 | Details |