Granted Patent
Utility
US 4,642,541 · App. 06/543,688
Track following servo for higher density disk files
Inventor:
Ashraf I. El-Sadi
Patented Case
View Patent ↗
Granted: Feb 10, 1987
Filed: Oct 20, 1983
Inventor
Ashraf I. El-Sadi
Assignee (at issue)
Memorex 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.