Granted Patent
Utility
US 4,184,577 · App. 05/892,239
Electromagnetic clutch with two stage torque buildup
Inventor:
Donald L. Miller
Patented Case
View Patent ↗
Granted: Jan 22, 1980
Filed: Mar 31, 1978
Inventor
Donald L. Miller
Assignee (at issue)
Facet Enterprises, Incorporated
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.