Issued Patents All Time
Showing 1–11 of 11 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 6776829 | Water-based ink composition for writing utensil | Masaru Miyamoto, Yoji Takeuchi, Shigeru Miyazaki | 2004-08-17 |
| 6599352 | Water-based ink composition for writing instrument | Masaru Miyamoto, Katsuhiko Shiraishi, Yoji Takeuchi | 2003-07-29 |
| 6554890 | Water based ink composition for writing instrument | Masaru Miyamoto | 2003-04-29 |
| 6492435 | Water based white color tone pigment ink for ball point pen | Masaru Miyamoto, Miki Shinozuka | 2002-12-10 |
| 6491747 | Water based ink composition for writing instrument | Masaru Miyamoto | 2002-12-10 |
| 6471759 | Water based ink composition for writing instrument | Masaru Miyamoto | 2002-10-29 |
| 6451099 | Water based ink composition for ball point pen | Masaru Miyamoto, Miki Shinozuka | 2002-09-17 |
| 6391927 | Method for manufacturing ink follower for water base ballpoint pens | Norio Ogura, Youji Takeuchi, Kiyoshi Iwamoto, Katsuhiko Shiraishi | 2002-05-21 |
| 6376560 | Ink follower for water-base ballpoint pens and method of manufacturing the same | Norio Ogura, Youji Takeuchi, Kiyoshi Iwamoto, Katsuhiko Shiraishi | 2002-04-23 |
| 6312510 | Water-base white pigment ink for ballpoints | Miki Shinozuka, Masaru Miyamoto | 2001-11-06 |
| 6227738 | Method of manufacturing ink follower for water-base ballpoint pens | Norio Ogura, Youji Takeuchi, Kiyoshi Iwamoto, Katsuhiko Shiraishi | 2001-05-08 |