Issued Patents All Time
Showing 1–7 of 7 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 7219147 | Method of effecting protection control in communication network and RPR apparatus | Gaku Kimura | 2007-05-15 |
| 6999422 | Communication device | — | 2006-02-14 |
| 6157704 | Subscriber line test system for access network | — | 2000-12-05 |
| 5615033 | Optical signal transmission apparatus and method | Rutsuko Yoshida | 1997-03-25 |
| 5483592 | Ringer unit driving system in a subscriber transmission system | Rika Got | 1996-01-09 |
| 5469282 | Power supply system for optical network unit of a fiber in the loop | — | 1995-11-21 |
| 5195124 | Testing system for local subscribers | — | 1993-03-16 |