Patent · US Expired

Ferromagnetic metal particles, consisting essentially of iron and carrying a surface coating, and their production

US4360377A · kind A · utility

10Cited by

3References

4Claims

0Family size

Assignee

BASF SE

Inventors

Werner Steck · Ludwigshafen, DE
Hermann Roller · Ludwigshafen, DE
Wilhelm Sarnecki · Schifferstadt, DE
Werner Balz · Schifferstadt, DE

Key dates

Filing date	Jun 29, 1981
Grant date	Nov 23, 1982
Priority date	—
Expiry date	Jun 29, 2001

Classification

Technology area (CPC Y)Emerging Cross-Sectional Technologies
CPC primaryY10T428/12181
WIPO fieldElectrical machinery, apparatus, energy
WIPO sectorElectrical engineering

Abstract

Ferromagnetic metal particles, consisting essentially of iron and comprising a core, containing not less than 85% by weight of metallic iron, and an iron oxide plus chromium oxide surface layer surrounding this core, which layer additionally contains one or more elements selected from the group comprising zinc, phosphorus in the form of phosphate, aluminum, calcium, strontium, barium, cadmium, lead, cobalt and nickel in a total amount of not more than 9.5% by weight, based on the total amount of the metal particles, and a process for the production of such particles.

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