Issued Patents All Time
Showing 1–2 of 2 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 4809023 | Automatic pencil device for automatic drafting and writing machines | Karl Kaiser | 1989-02-28 |
| 4538934 | Automatic lead advancing mechanism for a mechanical pencil | — | 1985-09-03 |