Issued Patents All Time
Showing 1–6 of 6 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 7837404 | Applicator | Yukinori Sawa, Akira Fukai, Takahiro Osada | 2010-11-23 |
| 6517273 | Free-ink type writing instrument | Takao Koyama, Kazuhisa Kirita | 2003-02-11 |
| 6443649 | Free-ink type writing instrument | Takao Koyama, Kazuhisa Kirita | 2002-09-03 |
| 5965634 | Water base ink composition | Hiroyuki Idogawa, Yasuaki Ogiwara, Kiyokazu Sakurai | 1999-10-12 |
| 5959000 | Erasable ink | Yasuaki Ogiwara, Kiyokazu Sakurai | 1999-09-28 |
| 5942560 | Colored resin fine particle water base dispersion liquid for water base ink | Hiroyuki Idogawa, Yasuaki Ogiwara, Kiyokazu Sakurai | 1999-08-24 |