Issued Patents All Time
Showing 1–3 of 3 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 5145946 | Process for preparing polyarylene sulfide with alkali metal salt of phenolic aromatic carboxylic acid | Tsuguo Fujii, Katsumasa Yamamoto | 1992-09-08 |
| 4515915 | Polyamide acid composition for preparing polyimide | Tsuneo Yamamoto, Takumi Kosugi | 1985-05-07 |
| 4454276 | Polyamide acid composition for preparing polyimide and process for preparing polyimide from the same | Tsuneo Yamamoto, Takumi Kosugi | 1984-06-12 |