Granted Patent
Utility
US 4,823,871 · App. 07/159,946
Hanger and seal assembly
Inventors:
James P. McEver, David H. Theiss
Patented Case
View Patent ↗
Granted: Apr 25, 1989
Filed: Feb 24, 1988
Inventors
James P. McEver
David H. Theiss
Assignee (at issue)
Cameron Iron Works USA, 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.