Patent · US Expired

Co-containing magnetic pigments, processes for the production thereof and the use thereof

US5028269A · kind A · utility

0Cited by

2References

5Claims

0Family size

Assignee

BAYER HEALTHCARE LLC · DE

Inventors

Gunter Buxbaum · Krefeld, DE
Jurgen Wiese · Krefeld, DE
Peter Kiemle · Uerdingen, DE
Aloys Eiling · Bochum, DE

Key dates

Filing date	Mar 5, 1990
Grant date	Jul 2, 1991
Priority date	—
Expiry date	Mar 5, 2010

Classification

Technology area (CPC Y)Emerging Cross-Sectional Technologies
CPC primaryY10S428/90
WIPO fieldAudio-visual technology
WIPO sectorElectrical engineering

Abstract

Acicular magnetic iron oxide pigments are disclosed which have a Co content of 1 to 5% by weight and an FeO content of 5 to 12% by weight. The pigments may optionally contain an additional dopant selected from zinc, phosphate and SiO.sub.2. The pigments are useful in magnetic recording media such as video tapes.

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