Granted Patent
Utility
US 5,004,160 · App. 07/494,751
Attachment system for liquid spray lance
Inventor:
Robert C. Berfield
Patented Case
View Patent ↗
Granted: Apr 2, 1991
Filed: Mar 16, 1990
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.