Issued Patents All Time
Showing 1–1 of 1 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 4853167 | Method for making lead pencils and colored pencils | Martin Bard, Isfried Petzenhauser | 1989-08-01 |
Showing 1–1 of 1 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 4853167 | Method for making lead pencils and colored pencils | Martin Bard, Isfried Petzenhauser | 1989-08-01 |