Granted Patent
Utility
US 4,633,488 · App. 06/670,825
Phase-locked loop for MFM data recording
Inventor:
Robert Shaw
Patented Case
View Patent ↗
Granted: Dec 30, 1986
Filed: Nov 13, 1984
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.