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:
Sep. 13, 2016
Filed:
Nov. 01, 2013
Applicant:
National Oilwell Varco, L.p., Houston, TX (US);
Inventor:
Alan H. Kitching, Katy, TX (US);
Assignee:
NATIONAL OILWELL VARCO, L.P., Houston, TX (US);
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
F04C 2/08 (2006.01); F04C 2/107 (2006.01); F01C 21/08 (2006.01);
U.S. Cl.
CPC ...
F04C 2/082 (2013.01); F01C 21/08 (2013.01); F04C 2/1071 (2013.01);
Abstract
A rotor for a progressive cavity device has a central axis and includes an outer tubular. The outer tubular has a radially outer surface and a radially inner surface defining a rotor cavity. The outer surface includes at least one helical rotor lobe. The rotor also includes a filler structure disposed within the rotor cavity. The outer tubular is made of a first material having a first density and the filler structure is made of a second material having a second density that is less than the first density.