Issued Patents 1989
Showing 1–2 of 2 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 4884858 | Distributed coupler switch | Takashi Ushikubo, Masato Kawahara, Issei Asabayashi | 1989-12-05 |
| 4846542 | Optical switch matrix | Akio Matoba, Nobuo Kobayashi, Issei Asabayashi, Kiyoshi Nagai, Ryoko Shibuya | 1989-07-11 |