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. 17, 1982
Filed:
Jan. 15, 1981
Applicant:
Inventors:
Assignee:
Societe Chimique des Charbonnages, Paris, FR;
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
C04B / ; C04B / ; C01F / ;
U.S. Cl.
CPC ...
423170 ; 8111 ; 106109 ; 156 39 ; 423166 ; 423264 ; 423555 ;
Abstract
A process for the whitening of phosphogypsum comprising treating a phosphogypsum in aqueous suspension with an amount of ozone equal to at least 150 parts by weight per million parts by weight of phosphogypsum calculated as Ca SO.sub.4.2H.sub.2 O, the pH of the aqueous suspension being lower than or equal to 3, to yield a whiteness grade of phosphogypsum higher than 75, according to French Standard NF Q 03-038.
Pichat, Philippe. (1982). Ozone whitening of synthetic gypsum (U.S. Patent No. 4344925). U.S. Patent and Trademark Office. https://idiyas.com/patent/badge/4344925
Data source: USPTO (United States Patent and Trademark Office) public patent records. Weekly synchronization. How IDiyas builds this profile