Granted Patent
Utility
US 4,528,513 · App. 06/488,595
Digital FM ratio detector with gain-controlled filter
Inventor:
Charles B. Dieterich
Patented Case
View Patent ↗
Granted: Jul 9, 1985
Filed: Apr 25, 1983
Inventor
Charles B. Dieterich
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.