Issued Patents All Time
Showing 1–3 of 3 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 4925976 | Olefin sulfonation method | Kentaro Kiyama, Kyozo Kitano | 1990-05-15 |
| 4671903 | Sulfonation method of polystyrene | Kyozo Kitano, Fumihiro Mikuchi | 1987-06-09 |
| 4390475 | Thin film type sulfonation process of alkylbenzene | Fusao Kondo, Katsumasa Nagano, Kyozo Kitano | 1983-06-28 |