Granted Patent
Utility
US 5,327,972 · App. 07/951,487
Wellhead system
Inventors:
David H. Theiss, Joseph H. Hynes
Patented Case
View Patent ↗
Granted: Jul 12, 1994
Filed: Sep 25, 1992
Inventors
David H. Theiss
Joseph H. Hynes
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.