Granted Patent
Utility
US 4,327,261 · App. 06/003,035
Apparatus for sensing a distended location on a drill pipe
Inventor:
Loren B. Sheldon
Patented Case
View Patent ↗
Granted: Apr 27, 1982
Filed: Jan 12, 1979
Inventor
Loren B. Sheldon
Assignee (at issue)
BJ-Hughes 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.