Issued Patents All Time
Showing 1–7 of 7 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 9079450 | Plastic eraser, plastic eraser composite body, and method for producing thereof | — | 2015-07-14 |
| 6706782 | Erasable ink and water-base ballpoint pen using same | — | 2004-03-16 |
| 6458192 | Erasable ink composition | — | 2002-10-01 |
| 6306930 | Erasable ink and water-base ballpoint pen using same | — | 2001-10-23 |
| 6203910 | Crayon | Hidetoshi Fukuo | 2001-03-20 |
| 6074465 | Fluorescent crayon | Hidetoshi Fukuo | 2000-06-13 |
| 4209332 | Method for manufacturing pencil leads | — | 1980-06-24 |