Patent · US Expired

Needle shaped alloy powders based on iron and their use

US4985073A · kind A · utility

3Cited by

2References

4Claims

0Family size

Assignee

BAYER HEALTHCARE LLC · DE

Inventors

Rolf Naumann · Krefeld, DE
Jakob Rademachers · Krefeld, DE
Fritz Rodi · Moers, DE

Key dates

Filing date	Jul 25, 1989
Grant date	Jan 15, 1991
Priority date	—
Expiry date	Jul 25, 2009

Classification

Technology area (CPC G)Physics
CPC primaryG11B5/712
WIPO fieldAudio-visual technology
WIPO sectorElectrical engineering

Abstract

Needle shaped alloy pigment powders consisting essentially of iron, silicon and aluminum, with up to 1.0% by weight of chromium and one or both of cobalt or tin in amounts from 0.3 to 3% by weight of cobalt and from 0.1 to 5.0% by weight of tin, based in each case on the iron, are useful as the magnetic powders used in magnetic recording devices.

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