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:
Jun. 05, 1984
Filed:
Dec. 14, 1981
Applicant:
Inventors:
Jay W Palmer, Temple Terrace, FL (US);
John C Gaynor, Des Plaines, IL (US);
Assignee:
United States Gypsum Company, Chicago, IL (US);
Primary Examiner:
Assistant Examiner:
Int. Cl.
CPC ...
C01F / ; C01F / ; C01F / ; C01B / ;
U.S. Cl.
CPC ...
423167 ; 423-2 ; 423320 ; 423555 ;
Abstract
A wet process for producing phosphoric acid and phosphoanhydrite by acidulation of phosphate rock with a phosphoric acid/sulfuric acid mixture containing a very high recycle content of small sized anhydrite seed crystals. A strong phosphoric acid is obtained having a concentration of at least about 35% P.sub.2 O.sub.5. Further, the phosphoanhydrite may be readily converted to an industrially usable gypsum product.