Granted Patent
Utility
US 4,975,930 · App. 07/266,089
Digital phase locked loop
Inventor:
Robert Shaw
Patented Case
View Patent ↗
Granted: Dec 4, 1990
Filed: Nov 2, 1988
Inventor
Robert Shaw
Assignee (at issue)
Digital Equipment 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.