Issued Patents All Time
Showing 1–3 of 3 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 4626120 | Resilient writing nib with offset flattened portion | Yutaka Shinohara, Takashi Tamura | 1986-12-02 |
| 4525092 | Tubular writing tip having an outer reduced diameter portion | Takahiko Shimizu, Tadashi Kohno | 1985-06-25 |
| 4364684 | Writing instrument | Tadashi Kohno, Takahiko Shimizu, Kenji Takahashi, Akio Okubo, Noriaki Masuda | 1982-12-21 |