Granted Patent
Utility
US 6,283,229 · App. 09/024,834
Impact device for directional boring
Inventors:
Steven W. Wentworth, Robert F. Crane
Patented Case
View Patent ↗
Granted: Sep 4, 2001
Filed: Feb 17, 1998
Inventors
Steven W. Wentworth
Robert F. Crane
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.