Granted Patent
Utility
US 4,251,176 · App. 05/938,518
Well tubing handling apparatus
Inventors:
Phillip S. Sizer, Malcolm N. Council
Patented Case
View Patent ↗
Granted: Feb 17, 1981
Filed: Aug 31, 1978
Inventors
Phillip S. Sizer
Malcolm N. Council
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.