Granted Patent
Utility
US 4,399,690 · App. 06/335,009
Vacuum leak detector having single valve assembly
Inventor:
Paul R. Fruzzetti
Patented Case
View Patent ↗
Granted: Aug 23, 1983
Filed: Dec 28, 1981
Inventor
Paul R. Fruzzetti
Assignee (at issue)
Varian, Inc.
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.