Granted Patent
Utility
US 6,079,312 · App. 09/081,457
Combined valving system for spring brake actuator
Inventor:
Ronald S. Plantan
Patented Case
View Patent ↗
Granted: Jun 27, 2000
Filed: May 19, 1998
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.