Issued Patents All Time
Showing 1–7 of 7 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| D297519 | Alarm buzzer | — | 1988-09-06 |
| 4700178 | A.C. alarm buzzer | — | 1987-10-13 |
| 4692741 | Motor actuated buzzer assembly with a plurality of leaf springs of different frequencies | Yutaka Iwasaki, Tadashi Ishii, Hikoji Iwasaki | 1987-09-08 |
| 4599498 | Tamper switch | Hikoji Iwasaki | 1986-07-08 |
| RE31152 | Alarm buzzer | Mitsuo Sakaguchi, Hikoji Iwasaki | 1983-02-15 |
| 4349800 | Magnetic proximity switch | — | 1982-09-14 |
| 4305066 | Motor driven bell sound generating system | — | 1981-12-08 |