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. 05, 2003
Filed:
Mar. 13, 2001
Mizusawa Industrial Chemicals Ltd, Tokyo, JP;
Abstract
Activated regular-shaped clay particles forming macropores therein, preserving fine structure of the dioctahedral smectite clay minerals, and having particle diameters controlled to lie within a range in which they exhibit excellent filtering property. The invention further provides method of producing activated regular-shaped clay particles comprising the steps of adjusting the particle size of the dioctahedral smectite clay minerals to possess a volume-based median diameter (D ) of from 1 to 10 &mgr;m as found by a laser diffraction method, mixing an acid-soluble or acid-decomposing inorganic compound to the milled product thereof, granulating the mixture into regular particles having a volume-based median diameter (D ) of from 10 to 60 &mgr;m as found by a laser diffraction method, and treating the regular-shaped particles with an acid while maintaining the particle shapes.