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. 11, 1998
Filed:
Feb. 14, 1997
Applicant:
Inventors:
William D Smiley, Salinas, CA (US);
George Bartich, Sutter Creek, CA (US);
Mike Stromberg, Jackson, CA (US);
Randy Lemley, Pine Grove, CA (US);
Robert L Antram, State College, PA (US);
Keith T Snider, Sutter Creek, CA (US);
Assignee:
North American Refractories Co., Cleveland, OH (US);
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
C04B / ; C04B / ;
U.S. Cl.
CPC ...
106484 ; 106486 ; 106718 ; 106811 ; 106819 ; 501141 ; 4233281 ; 4233291 ;
Abstract
A method of forming powdered metakaolin for use as an additive in cement based materials comprising the steps of calcining kaolin so as to reduce the hydroxyl content thereof to produce a meta-stable material have an identifiable amorphousness, and pulverizing the meta-stable material into a powder having a particle size of 50 microns or less.