Granted Patent
Utility
US 4,307,347 · App. 06/052,732
Envelope detector using balanced mixer
Inventor:
Don N. Thomson
Patented Case
View Patent ↗
Granted: Dec 22, 1981
Filed: Jun 28, 1979
Inventor
Don N. Thomson
Assignee (at issue)
RCA 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.