Issued Patents All Time
Showing 1–4 of 4 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 5748723 | Telephone system | Katsuyuki Hanai | 1998-05-05 |
| 5715304 | Private branch exchange | Toshio Nishida, Hiroaki Nagashima | 1998-02-03 |
| 5602904 | System for controlling a call termination on the basis of caller data in a private switched telephone system | Katsuyuki Hanai | 1997-02-11 |
| 5430794 | Call charge management device in private branch exchange system | — | 1995-07-04 |