Granted Patent
Utility
US 4,843,316 · App. 07/144,690
Nondestructive M-H hysteresis testers for magnetic discs for computer disc drives
Inventor:
Victor W. Hesterman
Patented Case
View Patent ↗
Granted: Jun 27, 1989
Filed: Jan 13, 1988
Inventor
Victor W. Hesterman
Assignee (at issue)
Hewlett-Packard Company, L.P.
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.