Granted Patent
Utility
US 4,374,438 · App. 06/170,999
Digital frequency and phase lock loop
Inventor:
Albert T. Crowley
Patented Case
View Patent ↗
Granted: Feb 15, 1983
Filed: Jul 21, 1980
Inventor
Albert T. Crowley
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.