Granted Patent
Utility
US 5,671,654 · App. 08/567,598
Sealed spring brake actuator
Inventor:
Ronald S. Plantan
Patented Case
View Patent ↗
Granted: Sep 30, 1997
Filed: Dec 5, 1995
Inventor
Ronald S. Plantan
Assignee (at issue)
INDIAN HEAD INDUSTRIES, 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.