Issued Patents All Time
Showing 1–5 of 5 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 7456321 | Process for producing high-purity 4,4′-dihydroxydiphenyl sulfone | Eiji Ogata, Fumio Oi, Norio Yanase | 2008-11-25 |
| 6974886 | Process for producing dihydroxydiphenylsulfone | Fumio Oi, Norio Yanase, Takayuki Kitahara | 2005-12-13 |
| 5241121 | Process for preparation of 4,4'-dihydroxydiphenylsulfone | Eiji Ogata, Kazuo Hamano | 1993-08-31 |
| 5189223 | Process for preparation of 4,4'-dihydroxydiphenylsulfone | Eiji Ogata | 1993-02-23 |
| 4820831 | Process for preparing 4,4'-dihydroxydiphenyl sulfone having high purity | Eiji Ogata, Koji Ono | 1989-04-11 |