Patent · US Expired

Acicular ferrimagnetic iron oxide and its preparation

US4457982A · kind A · utility

3Cited by

9References

3Claims

0Family size

Assignee

BASF SE

Inventors

Peter Rudolf · Ludwigshafen, DE
Jenoe Kovacs · Heßheim, DE
Guenter Vaeth · Schifferstadt, DE
Manfred Ohlinger · Bischofswerda, DE

Key dates

Filing date	Jan 28, 1983
Grant date	Jul 3, 1984
Priority date	—
Expiry date	Jan 28, 2003

Classification

Technology area (CPC Y)Emerging Cross-Sectional Technologies
CPC primaryY10T428/2991
WIPO fieldAudio-visual technology
WIPO sectorElectrical engineering

Abstract

A modified acicular ferrimagnetic iron oxide which consists of a core of gamma-iron(III) oxide and a surrounding shell of gamma-iron(III) oxide modified by tin dioxide and carbon, and a process for its preparation.

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