Issued Patents All Time
Showing 1–11 of 11 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| D323827 | Telephone set | Sadao Isozaki | 1992-02-11 |
| D320797 | Telephone instrument set | Sadao Isozaki | 1991-10-15 |
| D315564 | Direct station telephone selector | Sadao Isozaki | 1991-03-19 |
| D313235 | Telephone apparatus | Sadao Isozaki | 1990-12-25 |
| D310076 | Telephone | Sadao Isozaki, Yasuko Yajima | 1990-08-21 |
| D304564 | Attendant telephone switchboard | Sadao Isozaki, Yasuko Yajima | 1989-11-14 |
| D303801 | Direct station telephone selector | Sadao Isozaki, Yasuko Yajima | 1989-10-03 |
| D300029 | Direct station telephone selector stand | Sadao Isozaki, Yasuko Yajima | 1989-02-28 |
| D299134 | Telephone apparatus with speakerphone and display panel | Sadao Isozaki, Yasuko Yajima | 1988-12-27 |
| D287722 | Telephone stand | — | 1987-01-13 |
| D287723 | Telephone stand for direct station selection | — | 1987-01-13 |