Granted Patent
Utility
US 4,967,155 · App. 07/179,512
Environmentally controlled media defect detection system for Winchester disk drives
Inventor:
Vernon P. Magnuson
Patented Case
View Patent ↗
Granted: Oct 30, 1990
Filed: Apr 8, 1988
Inventor
Vernon P. Magnuson
Assignee (at issue)
Micropolis 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.