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Chitoshi Hagi
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Kumagaya, JP
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last 30 patents
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Patent Grant
Permanent magnet having good thermal stability and method for manuf...
Patent number
5,041,172
Issue date
Aug 20, 1991
Hitachi Metals, Ltd.
Masaaki Tokunaga
H01 - BASIC ELECTRIC ELEMENTS
Information
Patent Grant
Permanent magnet having good thermal stability and method for manuf...
Patent number
4,814,139
Issue date
Mar 21, 1989
Hitachi Metals, Ltd.
Masaaki Tokunaga
H01 - BASIC ELECTRIC ELEMENTS
Information
Patent Grant
Rare earth metal-cobalt permanent magnet alloy
Patent number
4,284,440
Issue date
Aug 18, 1981
Hitachi Metals, Ltd.
Masaaki Tokunaga
C22 - METALLURGY FERROUS OR NON-FERROUS ALLOYS TREATMENT OF ALLOYS OR NON-FER...
Information
Patent Grant
Permanent magnet alloy
Patent number
4,172,717
Issue date
Oct 30, 1979
Hitachi Metals, Ltd.
Masaaki Tokunaga
C22 - METALLURGY FERROUS OR NON-FERROUS ALLOYS TREATMENT OF ALLOYS OR NON-FER...