Granted Patent
Utility
US 4,428,489 · App. 06/322,217
Rotary railroad car F coupler
Inventor:
Richard M. Hanula
Patented Case
View Patent ↗
Granted: Jan 31, 1984
Filed: Nov 17, 1981
Inventor
Richard M. Hanula
Assignee (at issue)
Midland-Ross Corporation
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.