Granted Patent
Utility
US 5,332,048 · App. 07/965,200
Method and apparatus for automatic closed loop drilling system
Inventors:
Lance D. Underwood, Harold D. Johnson, Charles H. Dewey
Patented Case
View Patent ↗
Granted: Jul 26, 1994
Filed: Oct 23, 1992
Inventors
Lance D. Underwood
Harold D. Johnson
Charles H. Dewey
Assignee (at issue)
Halliburton
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.