Issued Patents All Time
Showing 1–3 of 3 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 8562235 | Ink composition for aqueous ink ball point pen and aqueous ink ball point pen | Hideaki Toomi, Takeshi Hayakawa, Syuji Ichikawa | 2013-10-22 |
| 7417080 | Oil-based ink composition and writing instrument using the same | Yoshihito Fujiwara, Tadashi Koriki, Yuji Omori, Naoto Yokokawa | 2008-08-26 |
| 5702512 | Oil ink composition | Takeshi Yadoiwa, Chie Yanase | 1997-12-30 |