Granted Patent
Utility
US 5,505,270 · App. 08/325,689
Reversible pneumatic ground piercing tool
Inventor:
Steven W. Wentworth
Patented Case
View Patent ↗
Granted: Apr 9, 1996
Filed: Oct 19, 1994
Inventor
Steven W. Wentworth
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.