Issued Patents 1989
Showing 1–5 of 5 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 4880452 | Method for producing glass preform for optical fiber containing fluorine in cladding | Hiroo Kanamori, Gotaro Tanaka, Naoki Yoshioka, Futoshi Mizutani | 1989-11-14 |
| 4812155 | Method for production of glass preform for optical fibers | Naoki Yoshioka, Gotaro Tanaka, Hiroo Kanamori, Minoru Watanabe, Motohiro Nakahara | 1989-03-14 |
| 4804247 | Quartz glass optical fiber | Shuzo Suzuki, Minoru Watanabe, Motohiro Nakahara | 1989-02-14 |
| 4804393 | Methods for producing optical fiber preform and optical fiber | Koji Yano, Minoru Watanabe, Masao Hoshikawa | 1989-02-14 |
| 4797143 | Process for the production of optical fiber preforms | Kazunori Chida, Hiroshi Yokota, Hisao Sato, Minoru Watanabe, Naoki Yoshioka | 1989-01-10 |