Issued Patents All Time
Showing 1–2 of 2 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 6910825 | Cap for a writing drawing or painting instrument | — | 2005-06-28 |
| 4548325 | Technical pen holder | Anke Hojer, Harald Hofmann, Axel Mikuteit, Hans-Joachim Ritter, Rolf Tenhagen | 1985-10-22 |