Granted Patent
Utility
US 4,938,060 · App. 07/292,330
Downhole inspection system
Inventors:
Phillips S. Sizer, Henry P. Arendt, Charles C. Cobb
Patented Case
View Patent ↗
Granted: Jul 3, 1990
Filed: Dec 30, 1988
Inventors
Phillips S. Sizer
Henry P. Arendt
Charles C. Cobb
Assignee (at issue)
Otis Engineering 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.