Granted Patent
Utility
US 4,780,962 · App. 06/558,105
Pipeline bend verification pig
Inventor:
Dennis R. Smith
Patented Case
View Patent ↗
Granted: Nov 1, 1988
Filed: Dec 5, 1983
Inventor
Dennis R. Smith
Assignee (at issue)
T.D. WILLIAMSON
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.