Granted Patent
Utility
US 4,858,034 · App. 07/234,556
Modular unitary disk file subsystem with differing density zones
Inventors:
Michael J. Hassel, Ian Felix, Claude E. Camp
Patented Case
View Patent ↗
Granted: Aug 15, 1989
Filed: Aug 22, 1988
Inventors
Michael J. Hassel
Ian Felix
Claude E. Camp
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.