Granted Patent
Utility
US 4,566,574 · App. 06/577,244
Multiple-disc electromagnetic clutch
Inventor:
Jeffrey F. Marshall
Patented Case
View Patent ↗
Granted: Jan 28, 1986
Filed: Feb 6, 1984
Inventor
Jeffrey F. Marshall
Assignee (at issue)
PT Components, 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.