Patent · US Expired

Ferromagnetic pigments

US6024890A · kind A · utility

5Cited by

10References

18Claims

0Family size

Assignee

Emtec Magnetics GmbH · DE

Inventors

Peter Poganiuch · Neustadt, DE
Ekkehard Schwab · Neustadt, DE
Wilma M. Dausch · Schifferstadt, DE
Reinhard Korner · Bischofswerda, DE
Werner Wimbersky · Ludwigshafen, DE

Key dates

Filing date	Jul 13, 1998
Grant date	Feb 15, 2000
Priority date	—
Expiry date	Jul 13, 2018

Classification

Technology area (CPC Y)Emerging Cross-Sectional Technologies
CPC primaryY10T428/2993
WIPO fieldElectrical machinery, apparatus, energy
WIPO sectorElectrical engineering

Abstract

The present invention relates to phosphorus-containing ferromagnetic pigments comprising, in particular, from 30 to 70% by volume of a core, said core comprising essentially iron and cobalt, and from 30 to 70% of a shell, said shell comprising essentially aluminum, phosporus, silicon, oxygen, and optionally magnesium and sodium; the invention further relates to a process for preparation of said pigments, their use in magnetic recording materials and magnetic recording materials which contain such pigments.

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