Issued Patents 2020
Showing 1–1 of 1 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 10711151 | Colored lead or colored chalk, pencil containing a colored lead, and process for preparing a colored lead or colored chalk | Vladimir Barroso, Eder D. J. Merola, Reiner Appel, Gerhard Lugert | 2020-07-14 |