Granted Patent
Utility
US 4,896,733 · App. 07/260,792
Technique for providing an underground tunnel utilizing a powered boring device
Inventors:
Glen Baker, Albert W. Chau, James A. Fikse, John E. Mercer
Patented Case
View Patent ↗
Granted: Jan 30, 1990
Filed: Oct 21, 1988
Inventors
Glen Baker
Albert W. Chau
James A. Fikse
John E. Mercer
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.