Patent · US Expired

Magnetic recording disk

US4423454A · kind A · utility

4Cited by

4References

3Claims

0Family size

Assignee

BASF SE

Inventors

Peter Felleisen · Lampertheim, DE
Dieter Mayer · Ludwigshafen, DE
Eberhard Koester · Bischofswerda, DE
Friedrich Domas · Altlußheim, DE
Paul Deigner · Bad Dürkheim, DE

Key dates

Filing date	Jun 26, 1980
Grant date	Dec 27, 1983
Priority date	—
Expiry date	Jun 26, 2000

Classification

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

Abstract

A magnetic recording disk comprising a non-magnetic substrate and two or more firmly adhering magnetizable layers applied to one or both sides thereof, the layer located directly on the substrate being magnetically isotropic, while the second layer and any additional layers exhibit orientation of the anisotropic magnetic particles parallel to the substrate and to the envisaged recording direction.

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