Granted Patent
Utility
US 5,110,144 · App. 07/573,630
Casing hanger seal assembly
Inventors:
James A. Burton, Rickey D. Book
Patented Case
View Patent ↗
Granted: May 5, 1992
Filed: Aug 24, 1990
Inventors
James A. Burton
Rickey D. Book
Assignee (at issue)
Cooper Industries Holdings
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.