Granted Patent
Utility
US 4,236,734 · App. 05/926,277
Well tubing coupling system
Inventor:
Mansour Ahangarzadeh
Patented Case
View Patent ↗
Granted: Dec 2, 1980
Filed: Jul 20, 1978
Inventor
Mansour Ahangarzadeh
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.