Issued Patents All Time
Showing 1–5 of 5 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 7063475 | Ink-storing body for writing utensil | Toshimi Kamitani, Takao Koyama | 2006-06-20 |
| 6659672 | Writing implement | — | 2003-12-09 |
| 6517273 | Free-ink type writing instrument | Takao Koyama, Atsushi Iwasa | 2003-02-11 |
| 6443649 | Free-ink type writing instrument | Takao Koyama, Atsushi Iwasa | 2002-09-03 |
| D449071 | Tip for a marking pen | — | 2001-10-09 |