Granted Patent
Utility
US 4,903,776 · App. 07/285,791
Casing hanger running tool using string tension
Inventors:
Philippe C. Nobileau, Bradley D. Beitler, Fergus D. S. McGhie
Patented Case
View Patent ↗
Granted: Feb 27, 1990
Filed: Dec 16, 1988
Inventors
Philippe C. Nobileau
Bradley D. Beitler
Fergus D. S. McGhie
Assignee (at issue)
Vetco Gray, LLC
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.