Perpendicular magnetic recording medium and magnetic recording/reproduction apparatus

Number of patents in Portfolio can not be more than 2000

United States of America Patent

PATENT NO 7132176
APP PUB NO 20040137277A1
SERIAL NO

10626837

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ATTORNEY / AGENT: (SPONSORED)

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Abstract

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A perpendicular magnetic recording medium includes a magnetic recording layer stacked on a substrate and having a first perpendicular magnetic recording layer containing cobalt, and a second perpendicular magnetic recording layer mainly containing a crystalline alloy which contains a rare earth element and a transition metal.

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Patent Owner(s)

Patent OwnerAddressTotal Patents
SHOWA DENKO K.K.TOKYO1103
KABUSHIKI KAISHA TOSHIBATOKYO20986

International Classification(s)

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Inventor(s)

Inventor Name Address # of filed Patents Total Citations
Hikosaka, Takashi Tokyo, JP 45 492
Iwasaki, Takeshi Funabashi, JP 151 1206
Nakamura, Futoshi Ichikawa, JP 40 350
Oikawa, Soichi Chiba, JP 66 903
Sakai, Hiroshi Ichihara, JP 254 2568
Sakawaki, Akira Ichihara, JP 69 471
Shimizu, Kenji Ichihara, JP 146 1109

Cited Art Landscape

Patent Info (Count) # Cites Year
 
WD MEDIA, INC. (1)
* 5679473 Magnetic recording medium and method for its production 68 1995
 
ASAHI KOMAG CO., LTD. (1)
* 5478661 Magnetic recording medium and method for its production 17 1993
 
KABUSHIKI KAISHA TOSHIBA (1)
* 5792564 Perpendicular recording medium and magnetic recording apparatus 18 1995
 
TEIJIN LIMITED (1)
5665468 Magneto-optical recording medium 17 1994
 
Hitachi Global Storage Technologies Japan, Ltd. (2)
* 5236791 Magnetic recording medium and magnetic storage 45 1989
* 5851643 Magnetic recording media and magnetic recording read-back system which uses such media 100 1997
 
FUJI ELECTRIC CO., LTD. (1)
* 2002/0018,917 Perpendicular magnetic recording medium 19 2001
* Cited By Examiner

Patent Citation Ranking

Forward Cite Landscape

Patent Info (Count) # Cites Year
 
SEAGATE TECHNOLOGY LLC (4)
* 2006/0286,413 Magnetic caplayers for corrosion improvement of granular perpendicular recording media 20 2005
* 7691499 Corrosion-resistant granular magnetic media with improved recording performance and methods of manufacturing same 3 2006
* 8728637 Corrosion resistant granular magnetic stack 2 2010
* 2010/0119,877 CORROSION-RESISTANT GRANULAR MAGNETIC MEDIA WITH IMPROVED RECORDING PERFORMANCE AND METHODS OF MANUFACTURING SAME 4 2010
 
KABUSHIKI KAISHA TOSHIBA (5)
* 7470474 Magnetic recording medium, production process thereof, and magnetic recording and reproducing apparatus including both oxide and non-oxide perpendicular magnetic layers 26 2004
* 2006/0204,791 Magnetic recording medium, method for producing thereof, and magnetic recording and reproducing apparatus 30 2004
* 7867638 Magnetic recording medium, method for producing thereof, and magnetic recording and reproducing apparatus 3 2008
* 2009/0141,399 MAGNETIC RECORDING MEDIUM, METHOD FOR PRODUCING THEREOF, AND MAGNETIC RECORDING AND REPRODUCING APPARATUS 9 2008
* 2009/0201,607 Patterned perpendicular magnetic recording medium and magnetic recording and reproducing apparatus 1 2009
 
WD MEDIA (SINGAPORE) PTE. LTD. (2)
* 8603650 Perpendicular magnetic recording disk and manufacturing method thereof 60 2005
* 2007/0148,499 Perpendicular magnetic recording disk and manufacturing method thereof 5 2005
* Cited By Examiner

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