Granted Patent
Utility
US 4,733,733 · App. 06/828,392
Method of controlling the direction of a drill bit in a borehole
Inventors:
William Bradley, John E. Fontenot
Patented Case
View Patent ↗
Granted: Mar 29, 1988
Filed: Feb 11, 1986
Inventors
William Bradley
John E. Fontenot
Assignee (at issue)
NL Industries, Inc.
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.