Issued Patents All Time
Showing 1–4 of 4 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 5139557 | Method of performing an ion exchange of optical glass | Shigeo Kittaka, Hiroshi Koshi, Minoru Toyama, Noboru Akazawa | 1992-08-18 |
| 4874414 | Ion exchange processing method of glass | Takashi Yamagishi | 1989-10-17 |
| 4367012 | Optical glass fiber having cover glass of sodium zinc alumino borosilicate | Yoshirou Ikeda, Toshiro Ikuma | 1983-01-04 |
| 4265667 | Step-type light-transmitting body having excellent water resistance | Yoshirou Ikeda | 1981-05-05 |