Granted Patent
Utility
US 4,594,563 · App. 06/667,677
Signal comparison circuit and phase-locked-loop using same
Inventor:
Marshall Williams
Patented Case
View Patent ↗
Granted: Jun 10, 1986
Filed: Nov 2, 1984
Inventor
Marshall Williams
Assignee (at issue)
Ampex 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.