Issued Patents 1989
Showing 1–4 of 4 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 4861835 | Polymer blend composition suitable as optical material | Taku Yamauchi, Toshio Koishi | 1989-08-29 |
| 4851323 | Optical information recording card using polymer blend as recording material | — | 1989-07-25 |
| 4842369 | Cladding material for plastic optical fiber and plastic optical fiber using the same | Shinichi Teshima, Shigeki Katsuta, Taku Yamauchi, Toshio Koishi | 1989-06-27 |
| 4835048 | Optical information recording card using phase separation of polymer blend | Toshio Koishi | 1989-05-30 |