Issued Patents All Time
Showing 1–6 of 6 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 8431632 | Crayon | Masamitsu Takahashi, Hidetoshi Fukuo | 2013-04-30 |
| 8299143 | Crayon and process for producing the same | Masamitsu Takahashi, Hidetoshi Fukuo | 2012-10-30 |
| 8242190 | Crayon and process for producing the same | Masamitsu Takahashi, Hidetoshi Fukuo | 2012-08-14 |
| 7943684 | Process for production of black crayon | Masamitsu Takahashi, Hidetoshi Fukuo | 2011-05-17 |
| 7485406 | Photostorage solid drawing medium | Hidetoshi Fukuo, Masamitsu Takahashi | 2009-02-03 |
| 7291210 | Solid drawing material and method for producing the same | Keiko Nakamura, Hidetoshi Fukuo | 2007-11-06 |