Granted Patent
Utility
US 5,810,298 · App. 08/848,803
Railroad spring frog assembly
Inventors:
Keith Young, Stephen R. Kuhn
Patented Case
View Patent ↗
Granted: Sep 22, 1998
Filed: May 1, 1997
Inventors
Keith Young
Stephen R. Kuhn
Assignee (at issue)
ABC Rail Products Corporation
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.