Granted Patent
Utility
US 5,250,906 · App. 07/778,371
Ionization gauge and method of using and calibrating same
Inventors:
Daniel G. Bills, Michael D. Borenstein
Patented Case
View Patent ↗
Granted: Oct 5, 1993
Filed: Oct 17, 1991
Inventors
Daniel G. Bills
Michael D. Borenstein
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.