Issued Patents 1989
Showing 1–1 of 1 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 4855993 | Method and apparatus for detecting a fault in a ring network data transmission system | Takuji Hamada, Masahiro Takahashi, Katsuhiko Yoneda, Toshihiko Uchiyama | 1989-08-08 |