Issued Patents All Time
Showing 1–3 of 3 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| D342277 | Ball-point pen | Tatsuo Ikegami, Seiji Osaki | 1993-12-14 |
| 5186562 | Elongate handwriting implement with rotatable decoration on rear end | Tatsuo Ikegami, Seiji Osaki | 1993-02-16 |
| D328310 | Ball-point pen | — | 1992-07-28 |