Granted Patent
Utility
US 5,555,597 · App. 08/366,037
Apparatus for converting a vacuum cleaning device into a liquid dispensing and suctioning system
Inventor:
Robert C. Berfield
Patented Case
View Patent ↗
Granted: Sep 17, 1996
Filed: Dec 29, 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.