Granted Patent
Utility
US 4,895,605 · App. 07/234,400
Method for the manufacture of hardened railroad rails
Inventors:
Robert J. Ackert, Murray A. Nott
Patented Case
View Patent ↗
Granted: Jan 23, 1990
Filed: Aug 19, 1988
Inventors
Robert J. Ackert
Murray A. Nott
Assignee (at issue)
Algoma Steel 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.