Issued Patents 1989
Showing 1–3 of 3 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 4885112 | Surface active secondary amidoamino acid or salt compounds | Kohshiro Sotoya, Makoto Kubo, Masanobu Tanigaki, Masaji Yamanishi, Hajime Hirota | 1989-12-05 |
| 4846947 | Process for preparing an alkanolammonium salt or ammonium salt of surface active agents | Kohshiro Sotoya, Makoto Kubo, Masanobu Tanigaki, Masaji Yamanishi | 1989-07-11 |
| 4845002 | Toner for development of electrostatically charged image | Masao Niki, Shinichiro Yasuda, Yukinaga Yokota | 1989-07-04 |