Issued Patents 1989
Showing 1–2 of 2 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 4811015 | Abnormal data transmission detection circuit for time-division multiplex transmission network system | Kazuyoshi Okada | 1989-03-07 |
| 4799218 | Network system | Atsushi Sakagami, Toru Futami, Tadashi Suzuki | 1989-01-17 |