Granted Patent
Utility
US 4,424,713 · App. 06/387,397
Silicon diaphragm capacitive pressure transducer
Inventors:
Paul M. Kroninger, Jr., Paul J. Freud, Dean P. Updike
Patented Case
View Patent ↗
Granted: Jan 10, 1984
Filed: Jun 11, 1982
Inventors
Paul M. Kroninger, Jr.
Paul J. Freud
Dean P. Updike
Assignee (at issue)
Federal Signal Corporation
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.