Issued Patents All Time
Showing 1–12 of 12 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 6494634 | Penpoint tip and an applicator having the tip incorporated therein | Masahiro Yasunaga | 2002-12-17 |
| 6283662 | Ink applicator, ink backflow prevention mechanism of ink applicator, and a pen tip | Tatsuya Ozu, Yasunori Nakatani | 2001-09-04 |
| 6200446 | Electrophoretic coloring composition | Hiroshi Inoue, Seishiro Ito | 2001-03-13 |
| 6036767 | Aqueous pigment dispersion composition for electro-deposition color coating | Tadaaki Ito | 2000-03-14 |
| 5712328 | Aqueous ball point ink composition | Toshimitsu Kawasumi | 1998-01-27 |
| 5709492 | Liquid applicator | Masahiro Yasunaga | 1998-01-20 |
| 5585189 | Pigment dispersion composition | Hiroshi Inoue, Seishiro Ito | 1996-12-17 |
| 5348411 | Writing implement and a fabricating method thereof | Tatsuya Ozu, Masahiro Yasunaga | 1994-09-20 |
| 5022775 | Writing inplement with magnetic closure | Tatsuya Ozu, Yasunori Nakatani | 1991-06-11 |
| 4911571 | Device for preventing drying of ink in writing instrument | Tatsuya Ozu, Hiroyoshi Yamamoto | 1990-03-27 |
| 4545818 | Aqueous ink compositions for ball-point pens | Hiroyoshi Yamamoto | 1985-10-08 |
| 4308061 | Aqueous ink composition | Masaru Iwahashi, Yoshinori Murata | 1981-12-29 |