Granted Patent
Utility
US 4,807,705 · App. 07/096,133
Casing hanger with landing shoulder seal insert
Inventors:
Herman O. Henderson, Jr., Joseph H. Hynes
Patented Case
View Patent ↗
Granted: Feb 28, 1989
Filed: Sep 11, 1987
Inventors
Herman O. Henderson, Jr.
Joseph H. Hynes
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.