Issued Patents All Time
Showing 1–9 of 9 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 11752796 | Tail plug and writing instrument | Makiko Morimoto | 2023-09-12 |
| 11472220 | Pen and pen refill | Makiko Morimoto | 2022-10-18 |
| 10081216 | Ink filling tool | Akina Niwa | 2018-09-25 |
| 6817802 | Writing instrument | Akira Matsuda, Masatoshi Yashima | 2004-11-16 |
| 6807704 | Brush flatter and drawing instrument equipped with brush flatter | — | 2004-10-26 |
| D472925 | Writing instrument | Akira Matsuda, Masatoshi Yashima | 2003-04-08 |
| D472926 | Writing instrument | Akira Matsuda, Masatoshi Yashima | 2003-04-08 |
| 6536969 | Writing tool equipped with ink reservoir | — | 2003-03-25 |
| 6439793 | Stippling instrument | Akira Matsuda, Munetoshi Koshihara, Masatoshi Yashima | 2002-08-27 |