Issued Patents All Time
Showing 1–2 of 2 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 4923962 | Optical disk substrate comprising aromatic polycarbonate | Kazuyoshi Shigematsu, Shuji Sakamoto, Toshiyasu Suzuki | 1990-05-08 |
| 4801679 | Polyformal resin and process for producing said resin | Kazuyoshi Shigematsu | 1989-01-31 |