Granted Patent
Utility
US 4,556,597 · App. 06/524,950
Ion doped servo pattern for magnetic recording disk
Inventors:
John S. Best, David Carl Bullock
Patented Case
View Patent ↗
Granted: Dec 3, 1985
Filed: Aug 22, 1983
Inventors
John S. Best
David Carl Bullock
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.