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Yukihisa Matsumura
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Chiba, JP
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Patents Grants
last 30 patents
Information
Patent Grant
Substrate for magnetic recording medium, magnetic recording medium,...
Patent number
8,951,652
Issue date
Feb 10, 2015
Showa Denko K.K.
Koji Yukimatsu
G11 - INFORMATION STORAGE
Information
Patent Grant
Magnetic recording medium substrate and manufacturing method theref...
Patent number
7,624,594
Issue date
Dec 1, 2009
Showa Denko K.K.
Yukihisa Matsumura
G11 - INFORMATION STORAGE
Information
Patent Grant
Magnetic disk with specified contact ratio [BH 1.0 nm] and circumfe...
Patent number
7,239,483
Issue date
Jul 3, 2007
Kabushiki Kaisha Toshiba
Koji Sonoda
G11 - INFORMATION STORAGE
Information
Patent Grant
Magnetic recording medium, process for producing the same, and magn...
Patent number
7,220,447
Issue date
May 22, 2007
Showa Denko K.K.
Masato Fukushima
G11 - INFORMATION STORAGE
Information
Patent Grant
Magnetic recording medium, process for producing the same, and magn...
Patent number
6,821,653
Issue date
Nov 23, 2004
Showa Denko Kabushiki Kaisha
Masato Fukushima
G11 - INFORMATION STORAGE
Patents Applications
last 30 patents
Information
Patent Application
SUBSTRATE FOR MAGNETIC RECORDING MEDIUM, MAGNETIC RECORDING MEDIUM,...
Publication number
20130136952
Publication date
May 30, 2013
SHOWA DENKO K.K.
Koji YUKIMATSU
G01 - MEASURING TESTING
Information
Patent Application
Magnetic Recording Medium Substrate and Manufacturing Method Theref...
Publication number
20070224460
Publication date
Sep 27, 2007
SHOWA DENKO K.K.
Yukihisa Matsumura
G11 - INFORMATION STORAGE
Information
Patent Application
Magnetic recording medium, process for producing the same, and magn...
Publication number
20050121839
Publication date
Jun 9, 2005
Showa Denko K.K.
Masato Fukushima
G11 - INFORMATION STORAGE
Information
Patent Application
Magnetic disk and magnetic disk apparatus equipped with magnetic disk
Publication number
20050052987
Publication date
Mar 10, 2005
Kabushiki Kaisha Toshiba
Koji Sonoda
G11 - INFORMATION STORAGE
Information
Patent Application
Magnetic recording medium, process for producing the same, and magn...
Publication number
20020055017
Publication date
May 9, 2002
SHOWA A DENKO K.K.
Masato Fukushima
G11 - INFORMATION STORAGE