Issued Patents All Time
Showing 1–2 of 2 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 8562235 | Ink composition for aqueous ink ball point pen and aqueous ink ball point pen | Hideaki Toomi, Masanao Yano, Takeshi Hayakawa | 2013-10-22 |
| 6945726 | Refill for oil-based ink ballpoint pen and oil-based ink ballpoint pen | Takayuki Ikai, Miyuki Shouji, Daisen Katou, Takeshi Kobayashi | 2005-09-20 |