Issued Patents All Time
Showing 1–2 of 2 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 4520548 | Method and apparatus for fastening an eraser to a pencil | Walter Barth | 1985-06-04 |
| 4509245 | Apparatus for securing parts on elongated writing instruments, in particular for securing an eraser for a sheath receiving it on a pencil | Walter Barth | 1985-04-09 |