Patent · US Expired

Preparation of acicular ferromagnetic metal particles consisting essentially of iron

US4378240A · kind A · utility

6Cited by

3References

3Claims

0Family size

Assignee

BASF SE

Inventors

Hansjoerg Siegle · Ludwigshafen, DE
Hans H. Reich · Ludwigshafen, DE
Horst Autzen · Freinsheim, DE
Werner Steck · Ludwigshafen, DE
Werner Loeser · Ludwigshafen, DE
Eckhard Hetzel · Frankenthal (Pfalz), DE
Manfred Ohlinger · Bischofswerda, DE

Key dates

Filing date	May 28, 1981
Grant date	Mar 29, 1983
Priority date	—
Expiry date	May 28, 2001

Classification

Technology area (CPC H)Electricity
CPC primaryH01F1/065
WIPO fieldElectrical machinery, apparatus, energy
WIPO sectorElectrical engineering

Abstract

A process for the preparation of acicular ferromagnetic metal particles, consisting essentially of iron, by reducing acicular iron oxides and/or iron oxide hydroxides, which are either pure or are modified with conventional foreign metal ions, by means of a gaseous reducing agent in a fluidized bed furnace in which a stirrer is provided immediately above the fluidizing grid.

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