Patent · US Expired

Process for preparing acicular ferromagnetic material consisting essentially of iron-containing chromium dioxide

US5030371A · kind A · utility

3Cited by

8References

2Claims

0Family size

Assignee

BASF SE

Inventors

Michael Mueller · Dresden, DE
Ekkehard Schwab · Neustadt, DE
Helmut Auweter · Schifferstadt, DE
Rainer Feser · Havelsee, DE
Rudi Lehnert · Ludwigshafen, DE
Norbert Mueller · Ostseebad Nienhagen, DE
Manfred Ohlinger · Bischofswerda, DE

Key dates

Filing date	Oct 31, 1989
Grant date	Jul 9, 1991
Priority date	—
Expiry date	Oct 31, 2009

Classification

Technology area (CPC G)Physics
CPC primaryG11B5/70636
WIPO fieldAudio-visual technology
WIPO sectorElectrical engineering

Abstract

An acicular, ferromagnetic material which has a high coercive force and essentially consists of iron-containing chromium dioxide is prepared by thermal decomposition of hydrated chromium(III) chromate under superatmospheric pressure.

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