Granted Patent
Utility
US 4,647,993 · App. 06/636,931
Rotary head recording system
Inventors:
Edward L. Schwarz, Theodore A. Schwarz
Patented Case
View Patent ↗
Granted: Mar 3, 1987
Filed: Aug 2, 1984
Inventors
Edward L. Schwarz
Theodore A. Schwarz
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.