EP 0024692 A3 19810826 - PROCESS FOR PREPARING ACICULAR FERROMAGNETIC IRON PARTICLES, AND THEIR USE
Title (en)
PROCESS FOR PREPARING ACICULAR FERROMAGNETIC IRON PARTICLES, AND THEIR USE
Publication
Application
Priority
DE 2935357 A 19790901
Abstract (en)
[origin: US4295879A] A process for the manufacture of acicular ferromagnetic iron particles by reducing an iron(III) oxide which carries a shape-stabilizing surface coating and has been produced by heating acicular iron(III) oxide hydroxide at 250 DEG -390 DEG C. in an atmosphere containing water vapor at a partial pressure of not less than 30 mbar, with hydrogen at 275 DEG -425 DEG C.
IPC 1-7
IPC 8 full level
G11B 5/706 (2006.01); B22F 9/22 (2006.01); C01G 49/02 (2006.01); C09D 5/23 (2006.01); C09D 7/12 (2006.01); G11B 5/70 (2006.01); H01F 1/06 (2006.01)
CPC (source: EP US)
B22F 9/22 (2013.01 - EP US); H01F 1/061 (2013.01 - EP US); H01F 1/065 (2013.01 - EP US)
Citation (search report)
- CH 528320 A 19720930 - STAMICARBON [NL]
- [D] FR 2385476 A1 19781027 - BASF AG [DE]
- [D] FR 2368131 A1 19780512 - BASF AG [DE]
Designated contracting state (EPC)
DE FR GB NL
DOCDB simple family (publication)
EP 0024692 A2 19810311; EP 0024692 A3 19810826; EP 0024692 B1 19840328; DE 2935357 A1 19810910; DE 3067268 D1 19840503; JP S5641835 A 19810418; US 4295879 A 19811020
DOCDB simple family (application)
EP 80104974 A 19800821; DE 2935357 A 19790901; DE 3067268 T 19800821; JP 11854180 A 19800829; US 17424080 A 19800731