Granted Patent
Utility
US 6,440,227 · App. 09/627,840
Nozzle and method providing increased liquid lift height for a wet/dry vacuum cleaner
Inventors:
Robert C. Berfield, Alan D. Kaufman
Patented Case
View Patent ↗
Granted: Aug 27, 2002
Filed: Jul 28, 2000
Inventors
Robert C. Berfield
Alan D. Kaufman
Assignee (at issue)
SHOP VAC CORPORATION
This patent predates the USPTO's electronic file wrapper — prosecution documents from this era exist only in the Patent Office's paper records. A certified copy of the file history can be ordered from the USPTO's paper archives.