Granted Patent
Utility
US 4,749,419 · App. 06/900,996
Method for heat treating rail
Inventors:
Richard Sommer, Michael Faber, Reuel E. Jennings
Patented Case
View Patent ↗
Granted: Jun 7, 1988
Filed: Aug 28, 1986
Inventors
Richard Sommer
Michael Faber
Reuel E. Jennings
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.