Granted Patent
Utility
US 4,172,530 · App. 05/894,700
Roll-over lock protection for railroad car coupler
Inventors:
Russell G. Altherr, John W. Kaim
Patented Case
View Patent ↗
Granted: Oct 30, 1979
Filed: Apr 10, 1978
Inventors
Russell G. Altherr
John W. Kaim
Assignee (at issue)
AMSTED INDUSTRIES INCORPORATED
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.