Granted Patent
Utility
US 4,351,032 · App. 06/161,563
Frequency sensing circuit
Inventor:
Richard F. Challen
Patented Case
View Patent ↗
Granted: Sep 21, 1982
Filed: Jun 20, 1980
Inventor
Richard F. Challen
Assignee (at issue)
General Electric 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.