Issued Patents All Time
Showing 1–2 of 2 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 5463679 | Public telephone system | Osamu Kai, Nobuo Suzuki, Tatsumi Takagi, Shigekazu Sakata, Hideyuki Oikawa | 1995-10-31 |
| 5448628 | Public telephone system | Tatsumi Takagi, Nobuo Suzuki, Shigekazu Sakata, Hideyuki Oikawa | 1995-09-05 |