Issued Patents All Time
Showing 1–5 of 5 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 4412102 | Key telephone system | Seiki Ogawa, Michio Mito | 1983-10-25 |
| 4392024 | Electronic key telephone set circuit for permitting dialing during failure of commercial power supplied to the set | Keisuke Mochizuki, Yoshimi Suzuki, Masaru Kudoh, Wataru Hashimoto | 1983-07-05 |
| 4347409 | Key telephone system | Seiki Ogawa, Michio Mito | 1982-08-31 |
| 4341927 | Data transmission apparatus | Fumikazu Hamatani | 1982-07-27 |
| 4260857 | Office line connection circuit during service interruptions in key telephone apparatus | Setsuo Oshima | 1981-04-07 |