Issued Patents All Time
Showing 1–5 of 5 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 6887008 | Ballpoint pen tip, ballpoint pen utilizing the ballpoint pen tip and method of manufacturing the ballpoint pen tip | Hiroyuki Muto | 2005-05-03 |
| 5915871 | Ball-point pen cap | Seiichi Kobayashi, Kazuhiko Furukawa, Hiroaki Koyama | 1999-06-29 |
| 5711626 | Ball-point pen with back flow stop | Seiichi Kobayashi, Kazuhiko Furukawa, Hiroaki Koyama | 1998-01-27 |
| 5690442 | Metal tip for ball-point pen | Shinsuke Sato, Toshiaki Takayanagi, Masao Hashi | 1997-11-25 |
| 5678942 | Ball-point pen | Seiichi Kobayashi, Kazuaki Matsumoto | 1997-10-21 |