Granted Patent
Utility
US 4,297,641 · App. 06/080,103
Serrodyning system employing an adjustable phase shifting circuit
Inventor:
Fred Sterzer
Patented Case
View Patent ↗
Granted: Oct 27, 1981
Filed: Sep 28, 1979
Inventor
Fred Sterzer
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.