Issued Patents 1997
Showing 1–2 of 2 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 5678369 | Refractory/heat insulating panels | Takashi Ishikawa, Hideki Takiguchi, Minoru Saitoh, Hiroaki Konta, Takanobu Niizeki +4 more | 1997-10-21 |
| 5666184 | Progressive power lens | Toshiaki Umeda | 1997-09-09 |