Issued Patents All Time
Showing 1–2 of 2 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 5034095 | Apparatus and process for the delignification of cellulose pulp | Hajime Yamanaka, Masaru Hirasawa, Keiichi Tsuchiya | 1991-07-23 |
| 4764252 | Process for pulping lignocellulosic material with a preoxidized alkaline sulfide pulping liquor containing a cyclic organic compound | Yoichi Shin, Isao Wada, Shigeru Eimaeda | 1988-08-16 |