Issued Patents All Time
Showing 1–4 of 4 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 4961765 | Electrical vacuum cleaner and filter bag for same | Wieland Guhne, Heinz-Jurgen Ahlf | 1990-10-09 |
| 4851019 | Electric vacuum cleaner | Heinz-Jurgen Ahlf, Jurgen Jager, Peter Wulf, Wieland Guhne | 1989-07-25 |
| 4302225 | Hand vacuum cleaner | Peter Wulf | 1981-11-24 |
| 4190307 | Adapter | — | 1980-02-26 |