Granted Patent
Utility
US 6,732,980 · App. 10/266,558
Railway frog wear component
Inventor:
Russell R. Hein
Patented Case
View Patent ↗
Granted: May 11, 2004
Filed: Oct 8, 2002
Inventor
Russell R. Hein
Assignee (at issue)
Progress Rail Services 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.