Issued Patents 2002
Showing 1–6 of 6 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 6491747 | Water based ink composition for writing instrument | Tadashi Kamagata | 2002-12-10 |
| 6492435 | Water based white color tone pigment ink for ball point pen | Miki Shinozuka, Tadashi Kamagata | 2002-12-10 |
| 6471759 | Water based ink composition for writing instrument | Tadashi Kamagata | 2002-10-29 |
| 6451099 | Water based ink composition for ball point pen | Tadashi Kamagata, Miki Shinozuka | 2002-09-17 |
| 6423127 | Pseudo-plastic water base ink for ball point pen | Shigeru Miyazaki, Yoji Takeuchi | 2002-07-23 |
| 6390710 | Aqueous gel ink-filled ball point pen | — | 2002-05-21 |