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:
Dec. 24, 1996
Filed:
Apr. 06, 1995
Applicant:
Inventors:
Carl J Marshall, Jr, Macon, GA (US);
Gary M Freeman, Macon, GA (US);
Assignee:
J. M. Huber Corporation, Edison, NJ (US);
Attorney:
Primary Examiner:
Assistant Examiner:
Int. Cl.
CPC ...
C04B / ;
U.S. Cl.
CPC ...
106416 ; 106402 ; 106413 ; 106445 ; 106447 ; 106460 ; 106465 ; 106471 ; 106479 ; 106486 ; 106487 ; 106490 ; 106491 ; 106499 ; 106285 ; 1621811 ; 1621816 ; 1621818 ; 523500 ; 523513 ; 523521 ; 524445 ; 524447 ;
Abstract
This invention involves a method of optically whitening clay minerals to transform their natural yellow tint to increased whiteness. Generally, it has been found that clay materials having low cation exchange capability can be directly reacted with very small amounts of cationic dyes, the apparent whiteness of said clay minerals being substantially increased thereby.