Issued Patents 1997
Showing 1–2 of 2 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 5645629 | Calcined pencil leads and method of manufacturing the same | Katsunori Kitazawa | 1997-07-08 |
| 5595589 | Baked color pencil lead and method of manufacturing the same | Masaaki Hoshiba | 1997-01-21 |