Patent · US Expired

Preparation of stabilized acicular ferromagnetic chromium dioxide

US5164173A · kind A · utility

4Cited by

8References

5Claims

0Family size

Assignee

BASF SE

Inventors

Norbert Muller · Tamm, DE
Manfred Ohlinger · Bischofswerda, DE
Rainer Feser · Havelsee, DE
Bernhard Bottcher · Bad Dürkheim, DE
Peter Rudolf · Ludwigshafen, DE
Werner Hubner · Bischofswerda, DE

Key dates

Filing date	May 27, 1988
Grant date	Nov 17, 1992
Priority date	—
Expiry date	May 27, 2008

Classification

Technology area (CPC C)Chemistry; Metallurgy
CPC primaryC01P2006/42
WIPO fieldAudio-visual technology
WIPO sectorElectrical engineering

Abstract

Stabilized acicular ferromagnetic chromium dioxide is prepared by a method in which the chromium dioxide surface formed as a result of a reductive treatment is treated with adsorbed monobasic or polybasic hydroxycarboxylic acids.

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