Granted Patent
Utility
US 5,111,753 · App. 07/631,905
Light weight fatigue resistant railcar truck bolster
Inventors:
Herbert L. Zigler, Robert D. Wronkiewicz, Franklin S. McKeown, Jr., William A. Wachter
Patented Case
View Patent ↗
Granted: May 12, 1992
Filed: Dec 21, 1990
Inventors
Herbert L. Zigler
Robert D. Wronkiewicz
Franklin S. McKeown, Jr.
William A. Wachter
Assignee (at issue)
AMSTED INDUSTRIES 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.