Issued Patents All Time
Showing 1–4 of 4 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 5574436 | Smoke detector including an indicator for indicating a missing primary power source which is powered by a substantially nonremovable secondary power source | Ronald Sisselman | 1996-11-12 |
| 5568129 | Alarm device including a self-test reminder circuit | Ronald Sisselman | 1996-10-22 |
| 4488044 | Ionization chamber for smoke detector and the like | Edward J. Thorp, Ronald J. Zegarski | 1984-12-11 |
| 4374329 | Smoke detector with test apparatus | George A. Schoenfelder, Richard E. Hiltenbrand | 1983-02-15 |