Issued Patents All Time
Showing 1–2 of 2 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 4251164 | Tip for ball point pen | Taketoshi Miyamoto, Naozi Umino, Hirosi Oyama | 1981-02-17 |
| 4231146 | Method of making a tip for a ball point pen | Taketoshi Miyamoto, Naozi Umino, Hirosi Oyama | 1980-11-04 |