Issued Patents All Time
Showing 1–2 of 2 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 6974886 | Process for producing dihydroxydiphenylsulfone | Fumio Oi, Norio Yanase, Nobuyuki Nate | 2005-12-13 |
| 5596128 | Sulfonating agent and sulfonation process | Eiji Ogata, Norio Yanase | 1997-01-21 |