Granted Patent
Utility
US 4,847,558 · App. 07/237,677
Non-destructive method and apparatus using DC erase field for magnetic measurement of recording disc
Inventors:
Robert D. Fisher, Jason L. Pressesky
Patented Case
View Patent ↗
Granted: Jul 11, 1989
Filed: Aug 25, 1988
Inventors
Robert D. Fisher
Jason L. Pressesky
Assignee (at issue)
Seagate Technology LLC
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.