Granted Patent
Utility
US 4,256,041 · App. 06/057,746
Damping railway truck friction shoe
Inventors:
James M. Kemper, Lynn K. Tilly
Patented Case
View Patent ↗
Granted: Mar 17, 1981
Filed: Jul 16, 1979
Inventors
James M. Kemper
Lynn K. Tilly
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.