Issued Patents All Time
Showing 1–4 of 4 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 5091564 | Process for preparing diphenyl sulfonetetracarboxylic acid | Mikio Nakazawa, Shigeo Miki, Akihiro Nishiuchi | 1992-02-25 |
| 4914231 | Method for purifying a crude diphenylsulfone tetracarboxylic acid | Shigeo Miki, Mikio Nakazawa | 1990-04-03 |
| 4778932 | Process for preparing diarylsulfones | Shigeo Miki, Mikio Nakazawa | 1988-10-18 |
| 4606863 | Process for preparing carboxylic acid | Mikio Nakazawa, Kango Fujitani | 1986-08-19 |