Issued Patents All Time
Showing 1–3 of 3 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 4669617 | Pen holder device | Juergen Boeckmann, Bernhard Bruhn, Harald Hofmann, Anke Hoejer, Hans-Joachim Ritter +1 more | 1987-06-02 |
| 4558966 | Writing instrument with sealing cap | — | 1985-12-17 |
| 4548325 | Technical pen holder | Anke Hojer, Jurgen Bockmann, Harald Hofmann, Hans-Joachim Ritter, Rolf Tenhagen | 1985-10-22 |