Issued Patents All Time
Showing 1–3 of 3 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 7619120 | Processes for the preparation of diphenylsulfone compounds | Kiyoshi Katsuura, Tomoya Hidaka, Yasuo Ohnuki | 2009-11-17 |
| 6831201 | Process for producing diphenyl sulfone compound | Kiyoshi Katsuura, Tomoya Hidaka, Yasuo Ohnuki | 2004-12-14 |
| 5609672 | Composition for color development comprising 4-hydroxy-4'-isopropoxydiphenylsulfone, and a wet method for grinding and a dispersible solution for applying the same | Tomoya Hidaka, Shinichi Sato, Hiroyasu Sato | 1997-03-11 |