Granted Patent
Utility
US 4,624,140 · App. 06/635,665
Liquid medium capacitive displacement sensor
Inventors:
Jack A. Ekchian, Robert W. Hoffman, Leon Ekchian
Patented Case
View Patent ↗
Granted: Nov 25, 1986
Filed: Jul 30, 1984
Inventors
Jack A. Ekchian
Robert W. Hoffman
Leon Ekchian
Assignee (at issue)
Optimax Systems, Inc.
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.