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:
Oct. 25, 1994
Filed:
Mar. 13, 1992
Edward O Banker, Houston, TX (US);
Teruo Suzuki, Yokohama, JP;
Erich F Klementich, Houston, TX (US);
Jeffrey K Bouche, Houston, TX (US);
NKK Corporation, Tokyo, JP;
Marubeni Tubulars, Inc., Houston, TX (US);
Abstract
The present invention pertains to an improvement in buttress-threaded tubular connections. In particular, the connection is improved by controlling the tubular member thread pitch diameter tolerance to .+-.0.0015 inch, to provide a thread bearing contact pressure which is relatively constant over the entire length of the connection. In addition, the improved connection provides a reduction in hoop stress of about 20% over known buttress-threaded tubing connections. The present invention typically includes the use of variable make-up in combination with the control of the tubular member thread pitch diameter tolerance.