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:
Apr. 11, 1978
Filed:
Dec. 14, 1976
Itaru Toshimitsu, Shin-Nanyo, JA;
Sakumi Fujii, Shin-Nanyo, JA;
Masao Uchida, Shin-Nanyo, JA;
Yoshio Fujii, Shin-Nanyo, JA;
Abstract
In a process for preparing a pure phosphoric acid whereby phosphate rock is treated with sulfuric acid or hydrochloric acid to prepare a crude phosphoric acid, and wherein said crude acid is solvent extracted with an organic solvent to prepare an extracted aqueous phosphoric acid solution which is then concentrated, the improvement which comprises adding a fluorine compound to said extracted aqueous phosphoric acid solution, and concentrating the mixture under a reduced pressure and thereafter, contacting the concentrated phosphoric acid solution with steam or hot air.
Data source: USPTO (United States Patent and Trademark Office) public patent records. Weekly synchronization. How IDiyas builds this profile