Granted Patent
Utility
US 5,544,848 · App. 08/384,026
Railroad spring frog
Inventors:
Stephen R. Kuhn, Keith Young
Patented Case
View Patent ↗
Granted: Aug 13, 1996
Filed: Feb 6, 1995
Inventors
Stephen R. Kuhn
Keith Young
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.