Granted Patent
Utility
US 5,598,993 · App. 08/391,197
Pseudo heavy point frog assembly
Inventors:
Stephen R. Kuhn, Keith Young
Patented Case
View Patent ↗
Granted: Feb 4, 1997
Filed: Feb 21, 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.