Issued Patents All Time
Showing 1–3 of 3 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 5390252 | Authentication method and communication terminal and communication processing unit using the method | Tatsuo Nohara | 1995-02-14 |
| 5377267 | Method of authentication with improved security for secrecy of authentication key | Tatsuo Nohara | 1994-12-27 |
| 4759012 | Time division switching system | — | 1988-07-19 |