Issued Patents All Time
Showing 26–30 of 30 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| D298939 | Key telephone set with speakerphone and visual display panel | Kenichi Morikawa, Masafuku Akatsu, Tatsuya Kato, Seizo Ohta | 1988-12-13 |
| D298938 | Key telephone set with speaker phone | Kenichi Morikawa, Masafuku Akatsu, Tatsuya Kato, Seizo Ohta | 1988-12-13 |
| D284472 | Digital display pager | Nagakazu Yokoyama | 1986-07-01 |
| D284188 | Telephone instrument | Hideaki Kondo, Shinsuke Kadota, Keizou Ohta, Nagakazu Yokoyama | 1986-06-10 |
| D284079 | Telephone instrument | Toshio Kita, Masafuku Akatsu, Nagakazu Yokoyama | 1986-06-03 |