Issued Patents All Time
Showing 1–2 of 2 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 5591787 | Hard lead for a pencil | Gerhard Lugert | 1997-01-07 |
| 5346540 | Colored lead | — | 1994-09-13 |
Showing 1–2 of 2 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 5591787 | Hard lead for a pencil | Gerhard Lugert | 1997-01-07 |
| 5346540 | Colored lead | — | 1994-09-13 |