Granted Patent
Utility
US 6,606,923 · App. 09/683,746
Design method for drillout bi-center bits
Inventors:
Steven Hart, Graham Watson
Patented Case
View Patent ↗
Granted: Aug 19, 2003
Filed: Feb 11, 2002
Inventors
Steven Hart
Graham Watson
Assignee (at issue)
GRANT PRIDECO, L.P.
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.