Issued Patents All Time
Showing 1–3 of 3 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 5415808 | Flocculant for water treatment | Takao Hasegawa, Yasuhiro Ehara, Katsuhiro Hashimoto, Hiroshi Akazawa | 1995-05-16 |
| 5227089 | Method for producing flocculant for water treatment | Takao Hasegawa, Yasuhiro Ehara, Katsuhiro Hashimoto, Hiroshi Akazawa | 1993-07-13 |
| 4923629 | Method and flocculant for water treatment | Takao Hasegawa, Minoru Suzuki, Yasuhiro Ehara, Katsuhiro Hashimoto, Tadamasa Ozaki | 1990-05-08 |