Issued Patents All Time
Showing 1–4 of 4 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| D1057017 | Refill for a ball-point pencil | Hidehei Kageyama | 2025-01-07 |
| 12090777 | Writing instrument refills and writing instrument | Hidehei Kageyama | 2024-09-17 |
| 11090969 | Mechanical pencil | Hidehei Kageyama, Tadao Odaka | 2021-08-17 |
| 5662984 | Magnetic recording medium | Hidetoshi Honda, Yasumi Sato, Taketoshi Sato, Jota Ito, Yoshihito Ebine | 1997-09-02 |