Patent Explorer
Browse, filter, and analyze 4 patents across global jurisdictions.
| Patent Number | Title | Assignee | Status | Filing Date | Grant Date | Expires | Remaining | Claims | Actions |
|---|---|---|---|---|---|---|---|---|---|
| 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 | |
| US2227147A | Photoelectric burglar alarm system | American District Telegraph Co | Expired / Lapsed | 1938-03-24 | 1940-12-31 | 1958-03-24 | 0.0 yrs | 0 | |
| US2116462A | Automatic electric signal circuit | American District Telegraph Co | Expired / Lapsed | 1931-05-22 | 1938-05-03 | 1951-05-22 | 0.0 yrs | 0 | |
| US1331151A | Recording system and apparatus | American District Telegraph Co | Expired / Lapsed | 1917-01-27 | 1920-02-17 | 1937-01-27 | 0.0 yrs | 0 |