Issued Patents All Time
Showing 1–2 of 2 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 4256494 | Erasable ink composition for writing on an impervious surface | Masaji Yamamoto, Keiko Shioi | 1981-03-17 |
| 4212786 | Crayon compositions | — | 1980-07-15 |
Showing 1–2 of 2 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 4256494 | Erasable ink composition for writing on an impervious surface | Masaji Yamamoto, Keiko Shioi | 1981-03-17 |
| 4212786 | Crayon compositions | — | 1980-07-15 |