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:
Aug. 26, 2014
Filed:
Jan. 13, 2011
Applicants:
Alan Honggen Jiang, Gloucester, GB;
Harold Sreshta, Conroe, TX (US);
Inventors:
Alan Honggen Jiang, Gloucester, GB;
Harold Sreshta, Conroe, TX (US);
Assignee:
National Oilwell Varco, L.P., Houston, TX (US);
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
B24D 3/00 (2006.01); B24D 11/00 (2006.01); B24D 18/00 (2006.01); C09K 3/14 (2006.01); B24D 3/02 (2006.01); C09C 1/68 (2006.01); B22C 9/02 (2006.01); C22C 26/00 (2006.01); E21B 10/00 (2006.01); C22C 1/10 (2006.01);
U.S. Cl.
CPC ...
E21B 10/00 (2013.01); C22C 2001/1073 (2013.01); B22C 9/02 (2013.01); C22C 26/00 (2013.01);
Abstract
A thermally conductive sand shell molding system allows for controlling heat flow in a molten metal infiltrate powdered metal drill bit molding system to differentially cool the mold system to control differential shrinking and accompanying stress concentrations.