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. 23, 1985
Filed:
Sep. 06, 1984
Masanori Hayakawa, Ube, JP;
Satoshi Nishimura, Ube, JP;
Central Glass Company Limited, Ube, JP;
Abstract
Fine particles of a ferrite having the magnetoplumbite structure are prepared by hydrothermal treatment of .gamma.-Fe.sub.2 O.sub.3 and at least one compound of a divalent metal selected from Ba, Sr and Pb in an aqueous alkali solution, preferably at 80.degree.-360.degree. C. This process is suitable for preparation of hexagonal and thin plate-shaped particles of the ferrite and is advantageous in consuming only a small quantity of alkali. Alternative to .gamma.-Fe.sub.2 O.sub.3, it is possible to use either Fe.sub.3 O.sub.4 or an intermediate iron oxide expressed by (FeO).sub.x.Fe.sub.2 O.sub.3, where O<x<1, as the starting iron oxide with the addition of an oxidizer to the hydrothermal reaction system to cause oxidation of the starting iron oxide to .gamma.-Fe.sub.2 O.sub.3 during an initial stage of the hydrothermal treatment.
Data source: USPTO (United States Patent and Trademark Office) public patent records. Weekly synchronization. How IDiyas builds this profile