Granted Patent
Utility
US 4,296,356 · App. 06/102,480
Ionization vacuum gauge circuit
Inventors:
Karl Beinitz, Joachim Schubert
Patented Case
View Patent ↗
Granted: Oct 20, 1981
Filed: Dec 11, 1979
Inventors
Karl Beinitz
Joachim Schubert
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.