Granted Patent
Utility
US 4,579,002 · App. 06/667,021
Thermocouple vacuum gauge
Inventor:
John F. Zettler
Patented Case
View Patent ↗
Granted: Apr 1, 1986
Filed: Oct 31, 1984
Inventor
John F. Zettler
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.