Patent Explorer
Browse, filter, and analyze 31 patents across global jurisdictions.
| Patent Number | Title | Assignee | Status | Filing Date | Grant Date | Expires | Remaining | Claims | Actions |
|---|---|---|---|---|---|---|---|---|---|
| US4195286A | Alarm system having improved false alarm rate and detection reliability | American District Telegraph Co | Expired / Lapsed | 1978-01-06 | 1980-03-25 | 1998-01-06 | 0.0 yrs | 7 | |
| US3518654A | Method and apparatus for detecting a condition | American District Telegraph Co | Expired / Lapsed | 1967-05-16 | 1970-06-30 | 1987-05-16 | 0.0 yrs | 0 | |
| US3444544A | Light modulated intrusion detection system | American District Telegraph Co | Expired / Lapsed | 1965-07-19 | 1969-05-13 | 1985-07-19 | 0.0 yrs | 0 | |
| US3260991A | Apparatus for detecting motion and objects | American District Telegraph Co | Expired / Lapsed | 1963-03-20 | 1966-07-12 | 1983-03-20 | 0.0 yrs | 2 | |
| US3214734A | Protection signalling system having channel impedance alteration means for providing indications of remote station conditions | American District Telegraph Co | Expired / Lapsed | 1959-06-19 | 1965-10-26 | 1979-06-19 | 0.0 yrs | 2 | |
| US3134970A | Alarm system | American District Telegraph Co | Expired / Lapsed | 1961-05-31 | 1964-05-26 | 1981-05-31 | 0.0 yrs | 2 | |
| US3010100A | Direct current operated burglar alarm system with alternating current supervision | American District Telegraph Co | Expired / Lapsed | 1958-06-30 | 1961-11-21 | 1978-06-30 | 0.0 yrs | 0 | |
| US2985871A | Electric protection system | American District Telegraph Co | Expired / Lapsed | 1958-09-17 | 1961-05-23 | 1978-09-17 | 0.0 yrs | 0 | |
| US2983912A | Signalling circuit | American District Telegraph Co | Expired / Lapsed | 1959-06-18 | 1961-05-09 | 1979-06-18 | 0.0 yrs | 0 | |
| US2912540A | Defeat resistant burglar alarm contact | American District Telegraph Co | Expired / Lapsed | 1958-02-13 | 1959-11-10 | 1978-02-13 | 0.0 yrs | 0 | |
| US2678433A | Fire alarm system | American District Telegraph Co | Expired / Lapsed | 1950-07-20 | 1954-05-11 | 1970-07-20 | 0.0 yrs | 0 | |
| US2398594A | Signaling system | American District Telegraph Co | Expired / Lapsed | 1944-12-16 | 1946-04-16 | 1964-12-16 | 0.0 yrs | 0 | |
| US2390221A | Alarm system | American District Telegraph Co | Expired / Lapsed | 1943-07-03 | 1945-12-04 | 1963-07-03 | 0.0 yrs | 0 | |
| US2343987A | Alarm system | American District Telegraph Co | Expired / Lapsed | 1940-04-19 | 1944-03-14 | 1960-04-19 | 0.0 yrs | 0 | |
| US2332154A | Radiant energy alarm system | American District Telegraph Co | Expired / Lapsed | 1940-07-27 | 1943-10-19 | 1960-07-27 | 0.0 yrs | 0 | |
| US2311374A | Automatic fire control system for ventilating or air conditioning systems | American District Telegraph Co | Expired / Lapsed | 1938-11-01 | 1943-02-16 | 1958-11-01 | 0.0 yrs | 0 | |
| US2298840A | Alarm system | American District Telegraph Co | Expired / Lapsed | 1938-03-04 | 1942-10-13 | 1958-03-04 | 0.0 yrs | 0 | |
| US2289517A | Radio alarm system | American District Telegraph Co | Expired / Lapsed | 1938-09-30 | 1942-07-14 | 1958-09-30 | 0.0 yrs | 0 | |
| US2278936A | Radiant energy receiving system | American District Telegraph Co | Expired / Lapsed | 1939-04-25 | 1942-04-07 | 1959-04-25 | 0.0 yrs | 0 | |
| US2247246A | Micro-wave radio alarm system | American District Telegraph Co | Expired / Lapsed | 1938-12-03 | 1941-06-24 | 1958-12-03 | 0.0 yrs | 0 |
Showing 1 to 20 of 31 patents
Page 1 of 2
Next →