Granted Patent
Utility
US 4,831,469 · App. 07/079,302
Disk drive head retract and motor braking method and apparatus
Inventors:
Charles C. Hanson, Michael J. Ross
Patented Case
View Patent ↗
Granted: May 16, 1989
Filed: Jul 29, 1987
Inventors
Charles C. Hanson
Michael J. Ross
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.