Issued Patents All Time
Showing 1–5 of 5 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 5751216 | Projected beam-type smoke detector and receiving unit | — | 1998-05-12 |
| 5623253 | Projected beam-type smoke detector | Mariko Ishida | 1997-04-22 |
| 5502434 | Smoke sensor | Osami Minowa, Tetsuya Nagashima, Yoshihito Hirai, Mariko Ishida | 1996-03-26 |
| 4695734 | Photoelectric smoke sensor including a photosensing data correction ratio correction circuit | Hiroshi Honma | 1987-09-22 |
| 4651013 | Smoke detector with changeable pulse light emitting interval for monitoring purposes | Shigeru Kajii, Hiroshi Honma | 1987-03-17 |