Issued Patents 1989
Showing 1–2 of 2 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 4820793 | Method of preparing aromatic polyamides and polybenzoxazoles | Yoshio Imai, Yoshiyuki Oishi, Yutaka Maruyama | 1989-04-11 |
| 4806618 | Aromatic polyethers having biphenylfluorene group | Yoshio Imai, Yutaka Maruyama, Toshio Koishi | 1989-02-21 |