Granted Patent
Utility
US 4,640,136 · App. 06/680,378
Method for the processing of measurement data in a gas friction vacuum meter and a gas friction vacuum meter equipped with a circuit for the practice of this method
Inventor:
Lothar Schmidt
Patented Case
View Patent ↗
Granted: Feb 3, 1987
Filed: Dec 11, 1984
Inventor
Lothar Schmidt
Assignee (at issue)
Leybold-Heraeus GmbH
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.