Granted Patent
Utility
US 3,944,298 · App. 05/552,558
Truck bolster center bowl wear plate
Inventor:
John G. Cannon
Patented Case
View Patent ↗
Granted: Mar 16, 1976
Filed: Feb 24, 1975
Inventor
John G. Cannon
Assignee (at issue)
Westinghouse Air Brake Co.
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.