Issued Patents All Time
Showing 1–3 of 3 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 6875261 | Unburned color pencil lead | Hiroki Nishino | 2005-04-05 |
| 6511533 | Non-calcined lead of a colored pencil | — | 2003-01-28 |
| 6395076 | Non-calcined lead of a colored pencil | — | 2002-05-28 |