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. 11, 2014
Filed:
Dec. 09, 2011
Gastón Mauro Mazzaferro, Buenos Aires, AR;
Tommaso Coppola, Rome, IT;
Stefano Amato, Rome, IT;
Ramón Alberto Aguilar Armendariz, Veracruz, MX;
Philippe Pierre Darcis, Veracruz, MX;
Gastón Mauro Mazzaferro, Buenos Aires, AR;
Tommaso Coppola, Rome, IT;
Stefano Amato, Rome, IT;
Ramón Alberto Aguilar Armendariz, Veracruz, MX;
Philippe Pierre Darcis, Veracruz, MX;
Tenaris Connections Limited, Kingstown, VC;
Abstract
A threaded connection design having a double ellipse in the thread root for reducing stress fatigue is illustrated in this disclosure. The root groove includes a first portion comprising a first elliptical surface being part of a first ellipse. The root groove further includes a second portion comprising a second elliptical surface, being part of a second ellipse, and the second elliptical surface being joined tangentially at a first end to the first elliptical surface at a junction point that defines the bottom of the root groove. The second elliptical surface is joined tangentially at a second end to the load flank.