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Hitachi Magnetics Corporation Patents
Assignee:
Hitachi Magnetics Corporation
Address:
Edmore, MI
No. of patents:
7
Patents:












Patent Number Title Of Patent Date Issued
5348639 Surface treatment for iron-based permanent magnet including rare-earth element September 20, 1994
A surface treatment for a R-TM-X type of permanent magnet comprising the steps: Etching the magnet with nitric acid having a concentration of 0.2 to 10 vol %, then etching the magnet with a mixture of oxygenated water having a hydrogen peroxide concentration of 0.2 to 10 vol % and acetic
5332488 Surface treatment for iron-based permanent magnet including rare-earth element July 26, 1994
A magnetically anisotropic magnet substrate is coated with at least one layer of nickel plating followed by a chromate layer. The chromate top layer improves the corrosion resistance of the coated magnet substrate. In a preferred embodiment, the layer of nickel plating includes a first l
4031652 Fishing line release mechanism June 28, 1977
A fishing line release mechanism has a permanent magnet positioned within a housing with the poles of the magnet arranged to draw a magnetic release plate toward, or into contact with, the magnet. The release plate has a buttonlike configuration with a central aperture which enables the
4015362 Fishing line release mechanism April 5, 1977
A fishing line release mechanism has a permanent magnet positioned within a housing with the poles of the magnet arranged to draw a magnetic tripping member into the housing through an opening in which the tripping member is positioned. The tripping member includes at least one belaying
3970485 Binder and lubricant removal from cobalt-rare earth alloys July 20, 1976
An organic binder or lubricant in a pressed or compacted green body formed of cobalt-rare earth intermetallic particles is substantially removed from the green body before the carbon can react with the rare earth during sintering. This is accomplished by exposing the green body to a
3970484 Sintering methods for cobalt-rare earth alloys July 20, 1976
The invention covers the use of reactive hydrogen-containing atmospheres in the sintering and heat-aging of cobalt-rare earth intermetallic products.
3937904 Moving magnet electroacoustic transducer February 10, 1976
A transducer device such as a loudspeaker or microphone has a U-shaped core of magnetically permeable material with attached pole pieces defining a gap and a stationary electrical coil around the core. A permanent magnet is positioned for movement through the central portion of the gap a

 
 
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