The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Mar. 28, 2023
Filed:
Mar. 25, 2020
Applicant:
Ptc Liberty Tubulars Llc, Wilmington, DE (US);
Inventor:
Robert S. Sivley, IV, Kingwood, TX (US);
Assignee:
PTC Liberty Tubulars LLC, Liberty, TX (US);
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
F16L 15/06 (2006.01); E21B 17/042 (2006.01);
U.S. Cl.
CPC ...
F16L 15/06 (2013.01); E21B 17/042 (2013.01);
Abstract
A modified API buttress threaded casing connection is disclosed for use in drilling oil and gas wells in lieu of using conventional drill pipe. The coupling threads only are modified to include a reduced thread height thread form to relieve thread stresses at axial ends of the coupling. The reduced thread height thread form may be mated with standard single tapered API buttress thread forms formed on the pin ends. The axial length of the coupling may be generally shortened to permit abutment of the mating pins at the center of the coupling.