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:
Oct. 11, 1977
Filed:
Sep. 22, 1976
Applicant:
Inventors:
Walter L Haden, Jr, Westfield, NJ (US);
Peter A Isaac, Summit, NJ (US);
Assignee:
Engelhard Minerals & Chemicals Corporation, Edison, NJ (US);
Attorney:
Primary Examiner:
Assistant Examiner:
Int. Cl.
CPC ...
C09C / ;
U.S. Cl.
CPC ...
1062 / ; 106 72 ; 427146 ; 428331 ;
Abstract
Preparation of so-called 'reduced charge' montmorillonite or bentonite pigment from a naturally-occurring crude clay containing dioctahedral montmorillonite by ion-exchanging cations in the clay with hydrogen ions while the clay is in slurry form, filtering, pugging the filter cake with a preselected amount of a neutral or alkaline lithium salt, preferably the oxide, hydroxide or carbonate, and heat treating to collapse the mineral structure.