Issued Patents All Time
Showing 1–4 of 4 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 6554967 | Method of refining dihydroxyaryl compound | Shuji Tanaka, Hiroshi Kofuji, Tetsuro Kawashita | 2003-04-29 |
| 6348626 | Process for producing oxamide | Tomohiko Yamamoto, Yukio Inaba, Hideki Noguchi, Joji Funatsu | 2002-02-19 |
| 5393319 | Process for producing oxamide granules | Yukio Inaba, Tomohiko Yamamoto, Hideki Noguchi, Joji Funatsu | 1995-02-28 |
| 4958002 | High purity crystals of biphenyltetracarboxylic dianhydride and process for their preparation | Katsuo Imatani, Shinichirou Yamamoto | 1990-09-18 |