Granted Patent
Utility
US 6,422,479 · App. 09/941,010
Gauge plate and switch rod insulators
Inventors:
Kevin Ray Adkins, William T. Urmson, Jr., John Scott Cooper, John W. Mospan
Patented Case
View Patent ↗
Granted: Jul 23, 2002
Filed: Aug 28, 2001
Inventors
Kevin Ray Adkins
William T. Urmson, Jr.
John Scott Cooper
John W. Mospan
Assignee (at issue)
Portec Rail Products, Inc.
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.