Issued Patents All Time
Showing 1–2 of 2 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 12006443 | Core or crayon for writing and/or coloring | Vladimir Barroso, Gerhard Lugert | 2024-06-11 |
| 10711151 | Colored lead or colored chalk, pencil containing a colored lead, and process for preparing a colored lead or colored chalk | Vladimir Barroso, Marcel Prado Atassio, Reiner Appel, Gerhard Lugert | 2020-07-14 |