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:
Feb. 15, 1983
Filed:
Jun. 04, 1981
Charles A Bollfrass, Houston, TX (US);
Leonard S Landriault, Houston, TX (US);
Patrick E McDonald, Houston, TX (US);
Hydril Company, Los Angeles, CA (US);
Abstract
A new and improved threaded connector having one or more non-tapered threads on separate diametral steps with at least one flank 'hooked' so as to achieve a tensile strength approximately that of the tubular body, is disclosed. The wall thickness of the female member is controlled to improve thread loading and enable inwardly radial movement with the male member to prevent 'pulling out' under axial tensile loading. The outer thread step on the male member may only partially engage the threads on the female member such that the critical reduction of the tube wall thickness at the thread roots is a minimum. The resulting threaded connection formed on tubular members has a tensile efficiency in excess of the tube body yield strength and approaching that of the tube body ultimate tensile strength.