Granted Patent
Utility
US 4,931,338 · App. 07/244,202
Test disk having fluorocarbon resin asperities for magnetic disk drive component testing
Inventor:
Mark A. Toffle
Patented Case
View Patent ↗
Granted: Jun 5, 1990
Filed: Sep 14, 1988
Inventor
Mark A. Toffle
Assignee (at issue)
Magnetic Peripherals, Inc.
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.