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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.:

US 4287233 B1

PDFFull Text
Date of Patent:
Sep. 01, 1981

Filed:

Jan. 29, 1980

Manufacture of acicular cobalt-containing magnetic iron oxide

Applicant:
Inventors:

Peter Rudolf, Neuhofen, DE;

Werner Steck, Mutterstadt, DE;

Eberhard Koester, Frankenthal, DE;

Manfred Ohlinger, Frankenthal, DE;

Christof Jaeckh, Heidelberg, DE;

Assignee:

BASF Aktiengesellschaft, , DE;

Attorney:

Keil & Witherspoon

Primary Examiner:

Jack Cooper

Int. Cl.
CPC ...
C01G / ;
U.S. Cl.
CPC ...
427127 ; 252 6256 ; 427128 ; 427130 ;
Abstract

A process for the manufacture of acicular magnetic iron oxide consisting of core of gamma-iron(III) oxide and a ferrite shell which contains, based on the total amount of magnetic material, from 0.2 to 12 per cent by weight of cobalt(II) ions and from 0.1 to 15 per cent by weight of iron(II) ions, wherein a precipitate of cobalt(II) hydroxide and iron (II) hydroxide is applied to acicular gamma-iron(III) oxide particles and the latter are heated at 100.degree.-200.degree. C.

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Rudolf, Peter. (1981). Manufacture of acicular cobalt-containing magnetic iron oxide (U.S. Patent No. 4287233). U.S. Patent and Trademark Office. https://idiyas.com/patent/badge/4287233

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