Granted Patent
Utility
US 5,790,476 · App. 08/783,713
Methods and systems for locating an underground sewer using a buoy
Inventors:
Michael K. Stenstrom, William L. Reber, Cary D. Perttunen
Patented Case
View Patent ↗
Granted: Aug 4, 1998
Filed: Jan 16, 1997
Inventors
Michael K. Stenstrom
William L. Reber
Cary D. Perttunen
Assignee (at issue)
Motorola, 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.