Granted Patent
Utility
US 6,158,697 · App. 09/251,620
Railroad frog assembly with latch holdback
Inventors:
Keith Young, Stephen R. Kuhn
Patented Case
View Patent ↗
Granted: Dec 12, 2000
Filed: Feb 17, 1999
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.