Granted Patent
Utility
US 5,172,820 · App. 07/726,758
Female connection member used in an articulated coupling arrangement
Inventor:
David W. Daugherty, Jr.
Patented Case
View Patent ↗
Granted: Dec 22, 1992
Filed: Jul 8, 1991
Inventor
David W. Daugherty, Jr.
Assignee (at issue)
Westinghouse Air Brake Co.
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.