Granted Patent
Utility
US 6,705,395 · App. 10/074,703
Wellbore casing
Inventors:
Robert Lance Cook, David Paul Brisco, Lev Ring, Michael Bullock
Patented Case
View Patent ↗
Granted: Mar 16, 2004
Filed: Feb 12, 2002
Inventors
Robert Lance Cook
David Paul Brisco
Lev Ring
Michael Bullock
Assignee (at issue)
SHELL OIL COMPANY
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.