Issued Patents All Time
Showing 1–6 of 6 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 8306198 | Private branch exchange | — | 2012-11-06 |
| 7471778 | Private branch exchange | — | 2008-12-30 |
| 7113583 | Telephone and private branch exchange | — | 2006-09-26 |
| 6952467 | Private branch exchange | — | 2005-10-04 |
| 5757902 | Telephone exchange for wire telephone and radio telephone | — | 1998-05-26 |
| 5655012 | Private branch exchange apparatus | Kousuke Tsuchida | 1997-08-05 |