Patent · US Expired

Manufacture of acicular ferrimagnetic iron oxide

US4464352A · kind A · utility

8Cited by

5References

1Claims

0Family size

Assignee

BASF SE

Inventors

Horst Autzen · Freinsheim, DE
Herbert Motz · Beindersheim, DE
Peter Rudolf · Ludwigshafen, DE
Wilhelm Sarnecki · Schifferstadt, DE
Werner Steck · Ludwigshafen, DE
Guenter Vaeth · Schifferstadt, DE

Key dates

Filing date	Dec 10, 1982
Grant date	Aug 7, 1984
Priority date	—
Expiry date	Dec 10, 2002

Classification

Technology area (CPC C)Chemistry; Metallurgy
CPC primaryC01P2006/42
WIPO fieldAudio-visual technology
WIPO sectorElectrical engineering

Abstract

A process for the manufacture of acicular ferrimagnetic iron oxide by converting acicular iron(III) oxide hydroxide at from 300.degree. to 650.degree. C., by treatment with an organic compound which decomposes in this temperature range in the presence of iron oxide, the iron(III) oxide hydroxide used for the reaction being a lepidocrocite which has been heat-treated at from 300.degree. to 700.degree. C.

Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.