Granted Patent
Utility
US 4,536,270 · App. 06/555,851
Apparatus and method for shielding magnetic heads during a sputtering operation
Inventor:
Robert A. Johnson
Patented Case
View Patent ↗
Granted: Aug 20, 1985
Filed: Nov 28, 1983
Inventor
Robert A. Johnson
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.