Issued Patents All Time
Showing 1–13 of 13 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 5700101 | Writing tool | Shuhei Kageyama, Toshihiko Kageyama, Yoshihide Mitsuya | 1997-12-23 |
| 5683191 | Writing tool | Shuhei Kageyama, Toshihiko Kageyama, Yoshihide Mitsuya | 1997-11-04 |
| 5370471 | Writing tool, with eraser dispenser | Shubei Kageyama, Toshihiko Kageyama, Yoshihide Mitsuya | 1994-12-06 |
| 5236270 | Writing tool for advancing lead with eraser dispenser | Shuhei Kageyama, Toshihiko Kageyama, Yoshihide Mitsuya | 1993-08-17 |
| 5207522 | Knock type mechanical pencil with retractable eraser | Shuhei Kageyama, Toshihiko Kageyama, Yoshihide Mitsuya | 1993-05-04 |
| 5090831 | Writing instrument | Hidehei Kageyama, Yoshihide Mitsuya | 1992-02-25 |
| 5074694 | Latch mechanism for retractable writing instruments | Masuo Kubota, Shubei Kageyama, Yoshihide Mitsuya | 1991-12-24 |
| 5062727 | Writing tool | Shubei Kageyama, Toshihiko Kageyama, Yoshihide Mitsuya | 1991-11-05 |
| 5022774 | Writing tool with eraser dispenser | Shuhei Kageyama, Toshihiko Kageyama, Yoshihide Mitsuya | 1991-06-11 |
| 5018891 | Writing instrument with eraser dispenser | Hidehei Kageyama, Yoshihide Mitsuya | 1991-05-28 |
| 4973179 | Clip actuated latch mechanism for retractable writing instruments | Masuo Kubota, Shuhei Kageyama, Yoshihide Mitsuya | 1990-11-27 |
| 4957384 | Mechanical pencil | Hidehei Kageyama, Yoshihide Mitsuya | 1990-09-18 |
| 4955739 | Mechanical pencil having side push button actuated lead advance | Hidehei Kageyama, Yoshihide Mitsuya | 1990-09-11 |