Compositions – Magnetic – With wax – bitumen – resin – or gum
Reexamination Certificate
2006-11-21
2006-11-21
Sheehan, John P. (Department: 1742)
Compositions
Magnetic
With wax, bitumen, resin, or gum
C148S302000, C420S083000, C420S121000
Reexamination Certificate
active
07138070
ABSTRACT:
A magnetic material manufacturing method, a ribbon-shaped magnetic material manufactured by the method, a powdered magnetic material formed from the ribbon-shaped magnetic material and a bonded magnet manufactured using the powdered magnet material are disclosed. The method and the magnetic materials can provide magnets having excellent magnetic properties and reliability. A melt spinning apparatus1is provided with a tube2having a nozzle3at the bottom thereof, a coil4for heating the tube and a cooling roll5having a circumferential surface53on which dimple correcting means is provided. A melt spun ribbon8is formed by injecting the molten alloy6from the nozzle3so as to be collided with the circumferential surface53of the cooling roll5in an inert gas atmosphere (ambient gas) such as helium gas, so that the molten alloy6is cooled and then solidified. In this process, dimples to be produced on a roll contact surface of the melt spun ribbon are divided by the dimple correcting means, thereby preventing formation of huge dimples.
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Pat. Appl. entitled, “Cooling Roll, Ribbon-Shaped Magnetic Materials, Magnetic Powders and Bonded Magnets”.
Search Report from corres. European Patent Office Pat Appl. No. 01112805.5.
Arai Akira
Kato Hiroshi
Harness & Dickey & Pierce P.L.C.
Seiko Epson Corporation
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