Issued Patents All Time
Showing 1–3 of 3 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 6912757 | Vacuum cleaner with continuous liquid pick-up | Vincent Knauff, Dennis Lamberty | 2005-07-05 |
| 6440227 | Nozzle and method providing increased liquid lift height for a wet/dry vacuum cleaner | Robert C. Berfield | 2002-08-27 |
| 5548868 | Pilot and detent apparatus for a vacuum device | Robert C. Berfield | 1996-08-27 |