Issued Patents All Time
Showing 1–8 of 8 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 8764333 | Water based ink compositions for ballpoint pen | — | 2014-07-01 |
| 7322767 | Water-based ink composition for ballpoint pen and water-based ballpoint pen | — | 2008-01-29 |
| 6887921 | Ink follower composition for writing instruments, and process for its production | Youichi Takasu | 2005-05-03 |
| 6261352 | Water-based ball-point pen ink composition | — | 2001-07-17 |
| 6200053 | Ink follower composition for ballpoint pen and ballpoint pen using the same | Toshiji Yokotani | 2001-03-13 |
| 6012864 | Ink follower composition for ballpoint pen and ballpoint pen using the same | — | 2000-01-11 |
| 5904432 | Ballpoint pen tip, manufacturing method therefor, and ballpoint pen using the same | Masashi Ando, Nobuo Sekine, Masahiro Kondo, Nobuo Matsubara | 1999-05-18 |
| 5899625 | Ballpoint pen tip | Masashi Ando, Nobuo Sekine, Masahiro Kondo, Nobuo Matsubara | 1999-05-04 |