Granted Patent
Utility
US 4,267,935 · App. 06/072,707
Railway car rotary coupler
Inventor:
Walter C. Dilg
Patented Case
View Patent ↗
Granted: May 19, 1981
Filed: Sep 4, 1979
Inventor
Walter C. Dilg
Assignee (at issue)
Dresser Industries, 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.