Granted Patent
Utility
US 4,754,526 · App. 06/946,537
System including a multi-stepped nozzle assembly for back-boring an inground passageway
Inventors:
Olivier L. Tremoulet, Jr., Kenneth E. Fender, ANDREW ARTHUR PAUL BURNS
Patented Case
View Patent ↗
Granted: Jul 5, 1988
Filed: Dec 24, 1986
Inventors
Olivier L. Tremoulet, Jr.
Kenneth E. Fender
ANDREW ARTHUR PAUL BURNS
Assignee (at issue)
FlowMole Corporation
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.