Issued Patents All Time
Showing 1–2 of 2 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 5984559 | Ballpoint pen refill and fabrication method thereof | Kazuhiko Sasaki, Teruaki Fukasawa | 1999-11-16 |
| 4669906 | Ball-point pen venting arrangement | Kunio Narushima | 1987-06-02 |