Issued Patents All Time
Showing 1–3 of 3 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 6492435 | Water based white color tone pigment ink for ball point pen | Masaru Miyamoto, Tadashi Kamagata | 2002-12-10 |
| 6451099 | Water based ink composition for ball point pen | Masaru Miyamoto, Tadashi Kamagata | 2002-09-17 |
| 6312510 | Water-base white pigment ink for ballpoints | Tadashi Kamagata, Masaru Miyamoto | 2001-11-06 |