Issued Patents All Time
Showing 1–9 of 9 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 10023756 | Solid drawing material | Huyen Nguyen Thi Thanh, Tatsuya Murata, Motohiro Kasai, Masaaki Matsumoto, Kiyoshi Fujisawa +2 more | 2018-07-17 |
| 9090784 | Solid drawing material and solid drawing tool | Suguru Yazawa, Masaaki Matsumoto | 2015-07-28 |
| 8349063 | Pencil lead and production process for the same | Satoru Banzai | 2013-01-08 |
| 6746524 | Process for producing sintered color pencil lead | — | 2004-06-08 |
| 6645279 | Baked colored pencil lead and process for producing the same | Masaaki Hoshiba, Noboru Kanba | 2003-11-11 |
| 5911814 | Baked color pencil lead and process for producing the same | Masaaki Hoshiba | 1999-06-15 |
| 5645629 | Calcined pencil leads and method of manufacturing the same | Kazutaka Aoki | 1997-07-08 |
| 5595700 | Non-baked color pencil leads and method for preparing same | — | 1997-01-21 |
| 5318622 | Non-baked color pencil leads and method for preparing same | Yoji Nishimoto, Toshiyuki Maeda, Michio Saito | 1994-06-07 |