Issued Patents 2018
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 | Akihiro Shiobara, Kouichi Takayama, Yasuyuki Sugimoto, Susumu Yamaguchi, Hirotaka Masuda | 2018-10-02 |