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. 02, 2024
Filed:
Jul. 15, 2020
Applicant:
Carbo Ceramics Inc., Houston, TX (US);
Inventors:
Ray Janson, Houston, TX (US);
Ryan Canfield, Houston, TX (US);
Assignee:
CARBO CERAMICS INC., Houston, TX (US);
Attorney:
Primary Examiner:
Assistant Examiner:
Int. Cl.
CPC ...
B22C 3/00 (2006.01); B22C 7/02 (2006.01); B22C 9/04 (2006.01);
U.S. Cl.
CPC ...
B22C 3/00 (2013.01); B22C 7/02 (2013.01); B22C 9/04 (2013.01);
Abstract
A mullite shell mold for casting includes a facecoat layer containing ceramic flour. The mullite shell mold also includes a first layer disposed on the facecoat layer. The first layer can contain sintered ceramic media. The facecoat layer and the first layer can each contain less than 1 wt % crystalline silica.