Issued Patents All Time
Showing 1–3 of 3 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 7201073 | Angle adjusting device | Hirokazu Ishikawa | 2007-04-10 |
| 4884910 | Mechanical pencil | Hidehei Kageyama, Yoshihide Mitsuya | 1989-12-05 |
| 4872776 | Lead chuck of mechanical pencil | Hidehei Kageyama, Yoshihide Mitsuya | 1989-10-10 |