Granted Patent
Utility
US 5,033,592 · App. 07/477,227
Spring applied/pressure release emergency brake actuator
Inventor:
Glenn S. Metzelfeld
Patented Case
View Patent ↗
Granted: Jul 23, 1991
Filed: Feb 8, 1990
Inventor
Glenn S. Metzelfeld
Assignee (at issue)
Hayes Industrial Brake, 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.