Issued Patents All Time
Showing 1–2 of 2 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 8771410 | Ink for ballpoint pens and ballpoint pen using same | Aya Otsubo, Kiyonori Yasuike, Hiroki Kimura, Takashi Sekine | 2014-07-08 |
| 4966480 | Washing liquid cartridge for refill ink type writing instrument | Hitosi Watanabe, Toshinobu Kosaka, Katsuhiko Kawabata | 1990-10-30 |