Granted Patent
Utility
US 4,322,981 · App. 06/167,239
Railway car truck fatigue detector
Inventor:
Robert P. Radwill
Patented Case
View Patent ↗
Granted: Apr 6, 1982
Filed: Jul 10, 1980
Inventor
Robert P. Radwill
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.