Issued Patents 1989
Showing 1–4 of 4 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 4861282 | Waterproof connecting structure for connector | Masahiko Endo | 1989-08-29 |
| 4858188 | Semiconductor memory with improved write function | — | 1989-08-15 |
| 4825110 | Differential amplifier circuit | Takashi Yamaguchi | 1989-04-25 |
| 4821316 | Key telephone system | Senji Okumura, Ryuzo Sugiura, Masatoshi Ikeda | 1989-04-11 |