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Fuel Cells

Process-for-producing-cobalt-containing-magnetic-iron-oxide-powder

Galvanic cell comprising solid proton conductor as electrolyte

We claim: 1. In a galvanic cell having a metal oxide or metal sulfide electrode, a metal electrode, ...

Time responsive variable voltage power supply

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Briefly, according to the invention, there is provided an electrical energy source, comprising a ...

Improved battery assembly

In accordance with the present invention, an improved battery and an improved battery contact ...

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These and other objects and advantages of the present invention, which will appear from the ...

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An object of the present invention is to provide a semiconductor article which will not generate ...

Acid functional and epoxy functional polyester resins

Accordingly, a linear tertiary aliphatic carboxyl functional polyester resin is provided, ...

Vented filling plugs for electric storage cells

OF A PREFERRED EMBODIMENT The plug comprises a base 2 connected to a body 4 carrying a flip top ...

Automatic watering system for batteries and fuel cells

OF THE PREFERRED EXEMPLARY EMBODIMENTS Referring now to FIG. 1, there is shown an automatic ...

Battery watering device

Having described my invention, I claim: 1. A battery watering device, for passing water from a ...

Process for producing cobalt-containing magnetic iron oxide powder

Details

Inventors: Nakata, Kazuo; Ishikawa, Tsuneo; Honma, Ichiro; Koyama, Arata; Hirai, Masaharu; Amano, Masatoshi;
Assignee: Ishihara Sangyo Kaisha, Ltd. (Osaka, JP)
Primary Examiner: Cooper; Jack
Assistant Examiner:
Attorney, Agent or Firm: Cushman, Darby & Cushman

A phosphorus-containing magnetic iron oxide powder is subjected to the activation with an aqueous alkaline medium under pressure and then coated with a cobalt compound or a cobalt compound and other metallic compound(s) to produce a cobalt-containing magnetic iron oxide powder. The magnetic iron oxide powder obtained according to this process finds its best application to the production of magnetic recording media.

DETAILED DESCRIPTION An object of this invention is to provide a process for producing a cobalt-containing magnetic iron oxide powder having excellent magnetic characteristics such as high coercivity.
A further object of this invention is to provide a process for producing a cobalt-containing magnetic iron oxide powder, which process is characterized in that the phosphorus-containing magnetic iron oxide powder if first treated in an aqueous alkaline medium under pressure at a temperature of 10.
degree.
to 200.
degree.
C.
and then coated with a cobalt compound or a cobalt compound and other metallic compound(s).

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