Issued Patents All Time
Showing 1–2 of 2 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 4525092 | Tubular writing tip having an outer reduced diameter portion | Takahiko Shimizu, Hishao Fukui | 1985-06-25 |
| 4364684 | Writing instrument | Takahiko Shimizu, Kenji Takahashi, Hishao Fukui, Akio Okubo, Noriaki Masuda | 1982-12-21 |