Granted Patent
Utility
US 6,778,128 · App. 10/359,446
Method of locating underground utility lines and an underground utility line
Inventors:
Layne D. Tucker, Peter Lylick
Patented Case
View Patent ↗
Granted: Aug 17, 2004
Filed: Feb 4, 2003
Inventors
Layne D. Tucker
Peter Lylick
Assignee (at issue)
Guardian Angel Protection Inc.
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.