Granted Patent
Utility
US 4,231,908 · App. 06/014,336
Composition for use between polymeric tie plates and cross ties
Inventor:
Charles J. Pennino
Patented Case
View Patent ↗
Granted: Nov 4, 1980
Filed: Feb 23, 1979
Inventor
Charles J. Pennino
Assignee (at issue)
KOPPERS, 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.