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:
Jul. 07, 1981
Filed:
Oct. 12, 1979
Applicant:
Inventors:
Thomas A Williams, Beckermet, GB;
Frank M Cussons, Little Broughton, GB;
Assignee:
Albright & Wilson Limited, Warley, GB;
Attorney:
Primary Examiner:
Assistant Examiner:
Int. Cl.
CPC ...
C01B / ;
U.S. Cl.
CPC ...
4233 / ;
Abstract
Wet process phosphoric acid is purified by extraction with a hexanone of pentanone to form an organic extract, containing phosphoric acid, from which the acid content is recovered by treatment with water or aqueous phosphoric acid in 2 or more portions to give 2 or more purified acids, the recovery to give the last purified acid being in more than 1 countercurrent stage.