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:
Apr. 12, 2016
Filed:
Aug. 15, 2011
Harold A. Sreshta, Conroe, TX (US);
Jiinjen Albert Sue, The Woodlands, TX (US);
Stefan M. Butuc, The Woodlands, TX (US);
Jan Edgar Marshall, Conroe, TX (US);
Harold A. Sreshta, Conroe, TX (US);
Jiinjen Albert Sue, The Woodlands, TX (US);
Stefan M. Butuc, The Woodlands, TX (US);
Jan Edgar Marshall, Conroe, TX (US);
NATIONAL OILWELL VARCO, L.P., Houston, TX (US);
Abstract
A stator for a progressive cavity pump or motor comprises a tubular housing having a central axis. In addition, the stator comprises a stator insert coaxially disposed within the housing. The stator insert has a radially outer surface that engages the housing and a radially inner surface defining a helical-shaped through bore extending axially through the stator insert. The stator insert includes an insert body and an insert liner attached to the insert body. The insert body is radially positioned between the housing and the insert liner. The insert body comprises a reinforcement structure and a plurality of voids dispersed within the reinforcement structure.