Issued Patents All Time
Showing 1–2 of 2 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 5525692 | Dewatering agent for sludge | Hiroshi Oka | 1996-06-11 |
| 4891440 | Process for producing unsaturated quaternary ammonium slats | Yoshirou Nagatsu, Kazuya Harada, Hideaki Mukouyama | 1990-01-02 |