Issued Patents 1989
Showing 1–1 of 1 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 4820778 | Random copolymer containing hexagonal imide units, a process for producing the same, and an optical disc substrate made of the random copolymer | Akihiro Watanabe, Akihiro Wada, Rin-ichi Kakuta | 1989-04-11 |