Patent · US Expired

Stabilization of pyrophoric ferromagnetic acicular metal particles consisting essentially of iron

US4420330A · kind A · utility

6Cited by

8References

4Claims

0Family size

Assignee

BASF SE

Inventors

Helmut Jakusch · Bischofswerda, DE
Werner Loeser · Ludwigshafen, DE
Eberhard Koester · Bischofswerda, DE
Peter Rudolf · Ludwigshafen, DE
Werner Senkpiel · Hemsbach, DE
Werner Steck · Ludwigshafen, DE

Key dates

Filing date	Apr 16, 1982
Grant date	Dec 13, 1983
Priority date	—
Expiry date	Apr 16, 2002

Classification

Technology area (CPC H)Electricity
CPC primaryH01F1/061
WIPO fieldElectrical machinery, apparatus, energy
WIPO sectorElectrical engineering

Abstract

A process for stabilizing pyrophoric acicular metal particles consisting essentially of iron, by reaction with oxygen-containing gases in two stages, wherein, in the first stage, up to 1/3 of the passivating layer present in the final state is formed at from 25.degree. to 45.degree. C. and, in a subsequent second stage, the remainder of the passivating layer is formed at from 50.degree. to 70.degree. C.

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