Granted Patent
Utility
US 5,409,032 · App. 08/216,143
Pressure washer bypass valve
Inventor:
Robert C. Berfield
Patented Case
View Patent ↗
Granted: Apr 25, 1995
Filed: Mar 21, 1994
Inventor
Robert C. Berfield
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.