Granted Patent
Utility
US 4,280,073 · App. 06/016,586
Electromagnetically released spring applied friction brake with torque booster
Inventor:
Donald L. Miller
Patented Case
View Patent ↗
Granted: Jul 21, 1981
Filed: Mar 1, 1979
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.