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:
Oct. 19, 1976
Filed:
Apr. 25, 1975
Applicant:
Inventor:
Soichiro Nobuoka, Nara, JA;
Assignee:
Agency of Industrial Science & Technology, Tokyo, JA;
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
C01D / ;
U.S. Cl.
CPC ...
423633 ; 423551 ; 106304 ;
Abstract
Ferric sulfate obtained by the oxidation of ferrous sulfate or ferric sulfate available in its original state is added to an alkali hydroxide at a ratio such that the amount of said alkali hydroxide will be in excess of its stoichiometric proportion, so as to form a pasty substance. Then, this pasty substance is subjected to a hydrothermal treatment. From the resultant product of the treatment, there are obtained micaceous .alpha.-iron oxide crystals and aqueous solutions of sodium sulfate and alkali hydroxide.