Issued Patents All Time
Showing 1–4 of 4 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 7371785 | Erasable ink composition | Yasuyuki Yoshimura, Norimasa Kurihara, Atsushi Sudo, Isao Enjon | 2008-05-13 |
| 6730154 | Polychromic ink composition depending on viewing angle | Hiroshi Inoue, Satoshi Maruyama, Hidetoshi Fukuo, Naoshi Murata, Shoko Matsumoto +1 more | 2004-05-04 |
| 6666913 | Aqueous ink composition | Norimasa Kurihara, Atsushi Sudo, Yasuyuki Yoshimura | 2003-12-23 |
| 5854320 | Water base erasable ink compositions | Keiko Nakamura, Kenichi Shibuya | 1998-12-29 |