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. 14, 2015
Filed:
Nov. 10, 2010
Applicants:
Alan Martyn Eddison, York, GB;
David Anderson Coull, Montrose, GB;
Derek James Stuart, Aberdeen, GB;
Inventors:
Alan Martyn Eddison, York, GB;
David Anderson Coull, Montrose, GB;
Derek James Stuart, Aberdeen, GB;
Assignee:
National Oilwell Varco, L.P., Houston, TX (US);
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
E21B 7/24 (2006.01); E21B 4/18 (2006.01);
U.S. Cl.
CPC ...
E21B 4/18 (2013.01); E21B 7/24 (2013.01);
Abstract
A method of translating a member through a bore involving moving fluid through a tubular member such as a drill string, and generating impulses on the member by varying the passage of fluid through the member using a valve which opens at a first rate and closes at a different second rate to urge the member to advance in a selected direction. The valve may close quickly and open slowly, or may close slowly and open quickly.