Granted Patent
Utility
US 5,042,597 · App. 07/598,583
Horizontal drilling method and apparatus
Inventors:
William A. Rehm, Thomas D. Trunk, Timothy D. Baseflug, Steve L. Cromwell, Grady A. Hickman, Ralph D. Nickel, Michael S. Lyon
Patented Case
View Patent ↗
Granted: Aug 27, 1991
Filed: Oct 15, 1990
Inventors
William A. Rehm
Thomas D. Trunk
Timothy D. Baseflug
Steve L. Cromwell
Grady A. Hickman
Ralph D. Nickel
Michael S. Lyon
Assignee (at issue)
Becfield Horizontal Drilling Services 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.