Granted Patent
Utility
US 5,704,090 · App. 08/525,414
Bleed for a vacuum cleaner
Inventor:
Robert C. Berfield
Patented Case
View Patent ↗
Granted: Jan 6, 1998
Filed: Sep 8, 1995
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.