Issued Patents All Time
Showing 1–4 of 4 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 12220937 | Writing ball, method for manufacturing writing ball, and ballpoint pen with writing ball | — | 2025-02-11 |
| 10087337 | Oil-based ball-point pen refill, oil-based ball-point pen, and oil-based ball-point pen ink composition | Akihiro Shiobara, Yasuyuki Sugimoto, Susumu Yamaguchi, Toshihide KAWASAKI, Hirotaka Masuda | 2018-10-02 |
| 9346313 | Ballpoint pen tip and ballpoint pen using the same | Takumi Kajiwara | 2016-05-24 |
| 8430591 | Ballpoint pen tip and ballpoint pen | Keishi Okamoto, Satoru Ando, Tatsuyuki Nakatani, Yuki Nitta, Kunihiro Toyota +2 more | 2013-04-30 |