Granted Patent
Utility
US 4,640,422 · App. 06/698,782
Knuckle structure to prevent knuckle pin failure in a railway coupler
Inventor:
William O. Elliott
Patented Case
View Patent ↗
Granted: Feb 3, 1987
Filed: Feb 6, 1985
Inventor
William O. Elliott
Assignee (at issue)
McConway & Torley, LLC
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.