Issued Patents All Time
Showing 1–2 of 2 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 5350820 | Butadienesulfonic acid or isoprenesulfonic acid copolymer | Hisao Ono, Katsumi Ito, Katsuhiro Ishikawa | 1994-09-27 |
| 5182343 | Homopolymers of sulfonated isoprene and 1,3-butadiene and agents containing the same | Hisao Ono, Katsumi Ito, Katsuhiro Ishikawa | 1993-01-26 |