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:
Jun. 13, 1995
Filed:
Jul. 30, 1993
William C Parks, Katy, TX (US);
Sonsub, Inc., Houston, TX (US);
Abstract
A concentric riser joint comprising inner and outer tubular assemblies each having a longitudinal bore therethrough. An annular space is formed between the inner and outer tubular assemblies. The outer tubular assembly comprises a tubular element having a pin end coupling connected to a first end and a box end coupling connected to a second end of the tubular element. A cylindrical retainer plate is received in the pin end coupling. The cylindrical retainer plate has an inner bore for receiving the inner tubular assembly therethrough. The retainer plate further includes a plurality of longitudinal bores extending therethrough. A seal sub is connected to one end of the inner tubular assembly. The seal sub is partially received in the box end coupling and includes a plurality of longitudinal passageways extending therethrough. A threaded nut connects the outer tubular assembly to an adjoining concentric riser joint. The box end coupling and the pin end coupling each have a mating end surface with a longitudinal blind bore therein such that the plurality of longitudinal passageways and the plurality of longitudinal bores are in axial alignment when the longitudinal blind bores are axially aligned. An alignment pin is fixedly received in one of the longitudinal blind bores. The alignment pin axially aligns the plurality of longitudinal passageways of the riser joint with the plurality of longitudinal bores of an adjoining riser joint.