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US 4,303,699 AGranted
Method of manufacturing magnetic powder
AssigneeSony Corporation
InventorHideo Tamura
Life of this patent
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Abstract
A method of manufacturing magnetic power is disclosed which includes the steps of mixing acicular magnetic iron oxide powders and metallic cobalt in aqueous solution containing an alkali hydroxide and keeping the solution at an elevated temperature during the mixing step to cause deposition of cobalt and/or a cobalt compound on the surface of the iron oxide powders.
Claims10
Method of manufacturing magnetic powder, consisting of:
- (a) forming a mixture consisting essentially of acicular magnetic iron oxide powder and metallic cobalt in an aqueous solution of an alkali hydroxide having a concentration of 0.1 mol/l to 10 mol/l under agitation, and
- (b) keeping said solution at an elevated temperature during said agitation to cause deposition of cobalt and/or cobalt compound on surface of said iron oxide powder.
Dependencies are inferred from the claim text.