Granted Patent
Utility
US 4,636,680 · App. 06/497,581
Vacuum gauge
Inventors:
Daniel G. Bills, Paul C. Arnold, Stephen L. Dodgen, Craig Brainerd Van Cleve
Patented Case
View Patent ↗
Granted: Jan 13, 1987
Filed: May 24, 1983
Inventors
Daniel G. Bills
Paul C. Arnold
Stephen L. Dodgen
Craig Brainerd Van Cleve
Assignee (at issue)
Granville-Phillips Company
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.