Issued Patents All Time
Showing 1–8 of 8 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 5524049 | Personal-servicing communication system | — | 1996-06-04 |
| 5440625 | Personal-servicing communication system | — | 1995-08-08 |
| 5153906 | Personal-servicing communication system | — | 1992-10-06 |
| 4961217 | Personal-servicing communication system | — | 1990-10-02 |
| 4759056 | Personal-servicing communication system | — | 1988-07-19 |
| 4736405 | Communication system with operation-procedure guiding function by speech | — | 1988-04-05 |
| 4720848 | Communication system with voice announcement means | — | 1988-01-19 |
| 4680785 | Personal-signaling communication system | Yoshio Otsuka | 1987-07-14 |