Granted Patent
Utility
US 4,458,273 · App. 06/258,400
Magnetic disk drive control apparatus and method
Inventor:
Jerome Johnson
Patented Case
View Patent ↗
Granted: Jul 3, 1984
Filed: Apr 28, 1981
Inventor
Jerome Johnson
Assignee (at issue)
IO-Mega Holding 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.