Issued Patents 2004
Showing 1–1 of 1 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 6830610 | Method for increasing the tensile, breaking and flexural strength of colored leads and colored pencils containing the same | Werner Bruchert, Willy Weiss | 2004-12-14 |
Showing 1–1 of 1 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 6830610 | Method for increasing the tensile, breaking and flexural strength of colored leads and colored pencils containing the same | Werner Bruchert, Willy Weiss | 2004-12-14 |