Patent · US Expired

Highly-coercive isometric iron oxides, a process for the production and the use thereof

US5002751A · kind A · utility

3Cited by

9References

8Claims

0Family size

Assignee

BAYER HEALTHCARE LLC · DE

Inventors

Jurgen Wiese · Krefeld, DE
Gunter Buxbaum · Krefeld, DE
Rolf Schafer
Fritz Rodi · Moers, DE

Key dates

Filing date	Aug 21, 1985
Grant date	Mar 26, 1991
Priority date	—
Expiry date	Aug 21, 2005

Classification

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

Abstract

Highly-coercive isometric iron oxide useful in magnetic toners for electrostatic photo-copying processes or for magnetic printers is produced by PA0 (a) subjecting Fe.sub.3 O.sub.4 pigment produced in a wet process to oxidation and PA0 (b) subsequently reducing the oxidized pigment from (a) to produce highly-coercive Fe.sub.3 O.sub.4 pigment.

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