Issued Patents 1989
Showing 1–1 of 1 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 4820831 | Process for preparing 4,4'-dihydroxydiphenyl sulfone having high purity | Eiji Ogata, Koji Ono | 1989-04-11 |
Showing 1–1 of 1 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 4820831 | Process for preparing 4,4'-dihydroxydiphenyl sulfone having high purity | Eiji Ogata, Koji Ono | 1989-04-11 |