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:
Sep. 26, 1978
Filed:
Mar. 21, 1977
Applicant:
Inventors:
Elliot P Hertzenberg, Wilmington, DE (US);
Irwin Jerry Itzkovitch, Willowdale, CA;
Ivan H Joyce, Oakville, CA;
Assignee:
PQ Corporation, Valley Forge, PA (US);
Primary Examiner:
Int. Cl.
CPC ...
C01F / ; C01F / ;
U.S. Cl.
CPC ...
423625 ; 423628 ; 2523 / ;
Abstract
A process for the preparation of finely divided dispersible alpha-alumina monohydrate (boehmite) from alumina trihydrate is disclosed. The alumina trihydrate is calcined thereby increasing the surface area through a partial dehydration. The calcined intermediate is slurried in water and autoclaved to achieve crystallization and rehydration. Conventional drying methods are used to obtain the particles. The particle size of the product is much smaller than that of the starting raw material.