Patent · US Expired

Manufacture of ferromagnetic metal particles essentially consisting of iron

US4165232A · kind A · utility

24Cited by

11References

2Claims

0Family size

Assignee

BASF SE

Inventors

Christof Jaeckh · Heidelberg, DE
Werner Steck · Ludwigshafen, DE
Rudolf Brodt · Hirschberg, DE
Manfred Ohlinger · Bischofswerda, DE
Werner Loeser · Ludwigshafen, DE
Eberhard Koester · Bischofswerda, DE

Key dates

Filing date	Sep 15, 1978
Grant date	Aug 21, 1979
Priority date	—
Expiry date	Sep 15, 1998

Classification

Technology area (CPC Y)Emerging Cross-Sectional Technologies
CPC primaryY10S428/90
WIPO fieldElectrical machinery, apparatus, energy
WIPO sectorElectrical engineering

Abstract

A process for the manufacture of acicular ferromagnetic metal particles which essentially consist of iron and carry, on their surface, from 0.02 to 0.6% by weight of boron in the form of a borate, by reducing an acicular iron oxide with a gaseous reducing agent at from 250.degree. to 500.degree. C., wherein a compound selected from the group comprising boron oxyacids and their inorganic salts is precipitated on the said iron oxide before reduction.

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