Granted Patent
Utility
US 6,789,635 · App. 10/173,995
Drill bit for directional drilling in cobble formations
Inventors:
Steven W. Wentworth, Robert F. Crane, Douglas Caraway
Patented Case
View Patent ↗
Granted: Sep 14, 2004
Filed: Jun 18, 2002
Inventors
Steven W. Wentworth
Robert F. Crane
Douglas Caraway
Assignee (at issue)
Earth Tool Company LLC
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.