Issued Patents All Time
Showing 1–4 of 4 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 5706340 | Telephone apparatus including circuit for producing dial data from serial key data | — | 1998-01-06 |
| 5398031 | DTMF signal generating circuit | — | 1995-03-14 |
| 5241591 | Telephone system having a dial data changeover switch | — | 1993-08-31 |
| 5031212 | Dialer circuit | Yoshihiro Ikefuji | 1991-07-09 |