Issued Patents 1989
Showing 1–3 of 3 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 4871999 | Fire alarm system, sensor and method | Takashi Ono | 1989-10-03 |
| 4838698 | Extinction type detector | Takashi Ono | 1989-06-13 |
| 4796205 | Fire alarm system | Yukio Yamauchi | 1989-01-03 |