Patent · US Expired

Chromium dioxide material, its preparation and magnetic recording media containing this chromium dioxide material

US5096779A · kind A · utility

1Cited by

8References

3Claims

0Family size

Assignee

BASF SE

Inventors

Michael Mueller · Dresden, DE
Ekkehard Schwab · Neustadt, DE
Helmut Auweter · Schifferstadt, DE
Rainer Feser · Havelsee, DE
Werner Huebner · Bischofswerda, DE
Norbert Mueller · Ostseebad Nienhagen, DE
Manfred Ohlinger · Bischofswerda, DE
Hermann Dikow · Hockenheim, DE

Key dates

Filing date	Aug 23, 1989
Grant date	Mar 17, 1992
Priority date	—
Expiry date	Aug 23, 2009

Classification

Technology area (CPC Y)Emerging Cross-Sectional Technologies
CPC primaryY10T428/2991
WIPO fieldAudio-visual technology
WIPO sectorElectrical engineering

Abstract

A chromium dioxide material consisting of acicular, ferromagnetic chromium dioxide particles having a nonmagnetic, hydrogen-containing protective surface layer, which material has improved stability to chemical decomposition, a process for its preparation and magnetic recording media containing this chromium dioxide and having good long-term stability of the residual magnetization under conditions of high humidity and temperature are described.

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