Granted Patent
Utility
US 4,285,280 · App. 05/924,610
Radial railway truck
Inventor:
Roy E. Smith
Patented Case
View Patent ↗
Granted: Aug 25, 1981
Filed: Jul 14, 1978
Inventor
Roy E. Smith
Assignee (at issue)
Urban Transportation Development Corp., Ltd.
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.