Granted Patent
Utility
US 4,326,669 · App. 05/914,180
Laminated wooden railroad crossite having exposed end-grain forming part of the load bearing surface
Inventors:
Roy H. Moult, Craig R. McIntyre
Patented Case
View Patent ↗
Granted: Apr 27, 1982
Filed: Jun 9, 1978
Inventors
Roy H. Moult
Craig R. McIntyre
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.