Issued Patents All Time
Showing 1–3 of 3 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 4897862 | Acoustic alarm detection system for telephone activation | Kaneyuki Nishihara, Philip H. Rittmueller | 1990-01-30 |
| 4394542 | Telephone transmission circuit | Michio Hara, Hiroshi Hara | 1983-07-19 |
| 4233474 | Telephone transmitter amplifier | Esao Hishinuma, Hiroshi Hara | 1980-11-11 |