Issued Patents All Time
Showing 1–4 of 4 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 5238320 | Pen nib of a writing instrument | Takahiro Komatsu | 1993-08-24 |
| 4795286 | Pen tip structure | Yasuhiro Aoki, Katsumi Otsuka | 1989-01-03 |
| 4362683 | Apparatus and method for producing a continuous nib rod for a writing instrument | Katsumi Otsuka | 1982-12-07 |
| 4207013 | Writing instrument | — | 1980-06-10 |