Granted Patent
Utility
US 4,645,085 · App. 06/720,797
Method of enhancing rigidity in a railway car coupler knuckle
Inventors:
Richard M. Hanula, Fred C. Kulieke, Jr.
Patented Case
View Patent ↗
Granted: Feb 24, 1987
Filed: Apr 8, 1985
Inventors
Richard M. Hanula
Fred C. Kulieke, Jr.
Assignee (at issue)
National Casting 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.