Granted Patent
Utility
US 4,892,249 · App. 07/170,527
Railroad grade crossing with improved transverse spline and anchoring assembly
Inventor:
S. Hudson Owen
Patented Case
View Patent ↗
Granted: Jan 9, 1990
Filed: Mar 21, 1988
Inventor
S. Hudson Owen
Assignee (at issue)
Koppers Industries, 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.