Granted Patent
Utility
US 4,926,757 · App. 07/302,902
Electrically grounded railway truck
Inventor:
Charles P. Spencer
Patented Case
View Patent ↗
Granted: May 22, 1990
Filed: Jan 30, 1989
Inventor
Charles P. Spencer
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.