Granted Patent
Utility
US 6,494,544 · App. 09/657,156
Axle and wheel mounting system for a wet/dry vacuum cleaner
Inventors:
Robert C. Berfield, Ronald Griffin, David Martinez
Patented Case
View Patent ↗
Granted: Dec 17, 2002
Filed: Sep 7, 2000
Inventors
Robert C. Berfield
Ronald Griffin
David Martinez
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.