Granted Patent
Utility
US 4,845,360 · App. 07/131,412
Counterflow leak detector with high and low sensitivity operating modes
Inventor:
Arthur A. Landfors
Patented Case
View Patent ↗
Granted: Jul 4, 1989
Filed: Dec 10, 1987
Inventor
Arthur A. Landfors
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.