Granted Patent
Utility
US 4,667,751 · App. 06/786,817
System and method for controlled directional drilling
Inventors:
Bela Geczy, Frank DeLucia
Patented Case
View Patent ↗
Granted: May 26, 1987
Filed: Oct 11, 1985
Inventors
Bela Geczy
Frank DeLucia
Assignee (at issue)
SMITH INTERNATIONAL, 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.