Granted Patent
Utility
US 6,543,550 · App. 09/747,162
Long range electronic guidance system for locating a discrete in-ground boring device
Inventor:
Nelson Hall
Patented Case
View Patent ↗
Granted: Apr 8, 2003
Filed: Dec 21, 2000
Inventor
Nelson Hall
Assignee (at issue)
UTILX 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.