Issued Patents All Time
Showing 1–1 of 1 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 10087337 | Oil-based ball-point pen refill, oil-based ball-point pen, and oil-based ball-point pen ink composition | Kouichi Takayama, Yasuyuki Sugimoto, Susumu Yamaguchi, Toshihide KAWASAKI, Hirotaka Masuda | 2018-10-02 |