Issued Patents All Time
Showing 1–5 of 5 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 6687361 | Electronic exchange and key telephone system | Tamotsu Wakabayashi, Masashi Ishida, Nobuhiro Masaki | 2004-02-03 |
| 6449360 | Cleaning method for telephone number list and system implemented therefor | — | 2002-09-10 |
| 5974119 | Credit status checking system for transaction processing system and checking method therefor | — | 1999-10-26 |
| 5796816 | Device and method for cleaning telephone number list | — | 1998-08-18 |
| 5636267 | Cleaning system for telephone number list | Teruyo Nakamoto | 1997-06-03 |