Granted Patent
Utility
US 4,882,671 · App. 07/329,400
Microprocessor controlled rigid disk file subsystem
Inventors:
Randolph H. Graham, Bruce R. Peterson, Richard J. Blackborow
Patented Case
View Patent ↗
Granted: Nov 21, 1989
Filed: Mar 27, 1989
Inventors
Randolph H. Graham
Bruce R. Peterson
Richard J. Blackborow
Assignee (at issue)
Plus Development
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.