Granted Patent
Utility
US 4,511,938 · App. 06/504,764
Magnetizable recording disk and disk file employing servo sector head positioning
Inventor:
Alan J. Betts
Patented Case
View Patent ↗
Granted: Apr 16, 1985
Filed: Jun 15, 1983
Inventor
Alan J. Betts
Assignee (at issue)
International Business Machines 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.