Issued Patents All Time
Showing 1–3 of 3 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 5741354 | Aqueous ink composition for ball-point pen | Toshimitsu Kawasumi | 1998-04-21 |
| 5683500 | Aqueous ink compositions and methods for their production | Toshimitsu Kawasumi, Hiroshi Inoue, Toshihiro Sawaki, Keiko Nakamura, Hiroyuki Fukui | 1997-11-04 |
| 5522920 | Aqueous ink composition for ball-point pen | Toshimitsu Kawasumi, Satoshi Maruyama | 1996-06-04 |