Issued Patents All Time
Showing 1–5 of 5 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 7946777 | Multi-refill writing instrument | Masashi Ando | 2011-05-24 |
| 5290117 | Penpoint assembly and writing instrument employing the same | Takehiko Yokosuka | 1994-03-01 |
| 4968169 | Penpoint assembly and writing instrument employing the same | Takehiko Yokosuka | 1990-11-06 |
| 4913175 | Liquid-applying tip assembly | Takehiko Yokosuka, Hiroshi Kato | 1990-04-03 |
| 4410290 | Composite pen tip | Akio Ito | 1983-10-18 |