Issued Patents All Time
Showing 1–5 of 5 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 7370386 | Dual cleaning mode carpet extractor | Nick Graupe, Agnes Friese | 2008-05-13 |
| 6684452 | Dual cleaning mode carpet extractor | Nick Graupe, Agnes Friese | 2004-02-03 |
| 5182834 | Vacuum pump-out control valve for wet/dry vacuum cleaner | William R. Wright | 1993-02-02 |
| 4854005 | Automatic floor scrubbing machine with squeegee assembly and adjustable wheels | Martin Wiese | 1989-08-08 |
| D277517 | Carpet and rug vacuum cleaner | Martin Wiese, Thomas E. Shearer | 1985-02-05 |