Granted Patent
Utility
US 4,252,993 · App. 06/092,085
Capacitance probe
Inventor:
Norman V. Beaman
Patented Case
View Patent ↗
Granted: Feb 24, 1981
Filed: Nov 7, 1979
Inventor
Norman V. Beaman
Assignee (at issue)
ROBERTSHAW CONTROLS PRIVATE LIMITED
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.