Issued Patents All Time
Showing 1–5 of 5 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 5741354 | Aqueous ink composition for ball-point pen | Yoshiko Yamaoka | 1998-04-21 |
| 5712328 | Aqueous ball point ink composition | Shigeyasu Inoue | 1998-01-27 |
| 5683500 | Aqueous ink compositions and methods for their production | Hiroshi Inoue, Toshihiro Sawaki, Keiko Nakamura, Hiroyuki Fukui, Yoshiko Yamaoka | 1997-11-04 |
| 5547499 | Aqueous ink composition | Hiroaki Ueda | 1996-08-20 |
| 5522920 | Aqueous ink composition for ball-point pen | Satoshi Maruyama, Yoshiko Yamaoka | 1996-06-04 |