Issued Patents All Time
Showing 1–5 of 5 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 6645279 | Baked colored pencil lead and process for producing the same | Katsunori Kitazawa, Noboru Kanba | 2003-11-11 |
| 5911814 | Baked color pencil lead and process for producing the same | Katsunori Kitazawa | 1999-06-15 |
| 5813216 | Solid writing tool and method of erasing lines drawn therewith | Toshiyuki Kawanishi | 1998-09-29 |
| 5733482 | Baked color pencil lead manufactured by impregnation with perhydropolysilazane and heat treatment | — | 1998-03-31 |
| 5595589 | Baked color pencil lead and method of manufacturing the same | Kazutaka Aoki | 1997-01-21 |