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US 4,226,909 AGranted
Cobalt-doped acicular hyper-magnetite particles
AssigneeMinnesota Mining and Manufacturing Company
InventorThomas M. Kanten
Life of this patent
Estimating the term…
Abstract
Acicular hyper-magnetite particles, that is, acicular particles of (FeO).sub.x Fe.sub.2 O.sub.3 where x is greater than one and not greater than 1.5, are provided with coatings of a cobalt compound, the cobalt providing 1% to 10% of the total weight of the particles. The particles provide superior magnetic recording media.
Claims4
Acicular particles useful for magnetic recording media, each haviang a core consisting essentially of acicular
- (FeO).sub.x Fe.sub.2 O.sub.3
- wherein x is greater than one and not greater than 1.5, and a surface layer comprising a cobalt compound, the cobalt being substantially only at the surface and providing 1-10% by weight of the particle.
Dependencies are inferred from the claim text.