US Patent No: 7,132,176

Number of patents in Portfolio can not be more than 2000

Perpendicular magnetic recording medium and magnetic recording/reproduction apparatus

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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.TOKYO1089
KABUSHIKI KAISHA TOSHIBATOKYO26617

International Classification(s)

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Inventor(s)

Inventor Name Address # of filed Patents Total Citations
Hikosaka, Takashi Tokyo, JP 45 471
Iwasaki, Takeshi Funabashi, JP 145 1060
Nakamura, Futoshi Ichikawa, JP 38 319
Oikawa, Soichi Chiba, JP 64 733
Sakai, Hiroshi Ichihara, JP 248 2256
Sakawaki, Akira Ichihara, JP 69 415
Shimizu, Kenji Ichihara, JP 141 884

Cited Art Landscape

Patent Info (Count) # Cites Year
 
WD MEDIA, INC. (1)
* 5,679,473 Magnetic recording medium and method for its production 65 1995
 
ASAHI KOMAG CO., LTD. (1)
* 5,478,661 Magnetic recording medium and method for its production 17 1993
 
KABUSHIKI KAISHA TOSHIBA (1)
* 5,792,564 Perpendicular recording medium and magnetic recording apparatus 18 1995
 
TEIJIN LIMITED (1)
5,665,468 Magneto-optical recording medium 17 1994
 
HITACHI GLOBAL STORAGE TECHNOLOGIES JAPAN, LTD. (2)
* 5,236,791 Magnetic recording medium and magnetic storage 41 1989
* 5,851,643 Magnetic recording media and magnetic recording read-back system which uses such media 96 1997
 
FUJI ELECTRIC CO., LTD. (1)
* 2002/0018,917 Perpendicular magnetic recording medium 18 2001
* Cited By Examiner

Patent Citation Ranking

Forward Cite Landscape

Patent Info (Count) # Cites Year
 
WD MEDIA (SINGAPORE) PTE. LTD. (2)
* 8,603,650 Perpendicular magnetic recording disk and manufacturing method thereof 36 2005
* 2007/0148,499 Perpendicular magnetic recording disk and manufacturing method thereof 5 2005
 
SEAGATE TECHNOLOGY LLC (3)
* 2006/0286,413 Magnetic caplayers for corrosion improvement of granular perpendicular recording media 18 2005
* 7,691,499 Corrosion-resistant granular magnetic media with improved recording performance and methods of manufacturing same 1 2006
* 8,728,637 Corrosion resistant granular magnetic stack 0 2010
 
KABUSHIKI KAISHA TOSHIBA (4)
* 7,470,474 Magnetic recording medium, production process thereof, and magnetic recording and reproducing apparatus including both oxide and non-oxide perpendicular magnetic layers 24 2004
* 2006/0204,791 Magnetic recording medium, method for producing thereof, and magnetic recording and reproducing apparatus 26 2004
* 7,867,638 Magnetic recording medium, method for producing thereof, and magnetic recording and reproducing apparatus 3 2008
* 2009/0201,607 Patterned perpendicular magnetic recording medium and magnetic recording and reproducing apparatus 1 2009
* Cited By Examiner

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