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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ALSO PUBLISHED AS: 20040137277
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Importance

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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.TOKYO1776
KABUSHIKI KAISHA TOSHIBATOKYO38341

International Classification(s)

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Inventor(s)

Inventor Name Address # of filed Patents Total Citations
Hikosaka, Takashi Tokyo, JP 69 394
Iwasaki, Takeshi Kawasaki, JP 173 846
Nakamura, Futoshi Kawasaki, JP 57 230
Oikawa, Soichi Kawasaki, JP 100 431
Sakai, Hiroshi Kariya, JP 331 1808
Sakawaki, Akira Ichihara, JP 111 289
Shimizu, Kenji Ichihara, JP 179 583

Cited Art Landscape

Patent Info (Count) # Cites Year
 
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 91 1997
 
ASAHI KOMAG CO., LTD. (1)
5,478,661 Magnetic recording medium and method for its production 17 1993
 
FUJI ELECTRIC CO., LTD. (1)
2002/0018,917 Perpendicular magnetic recording medium 17 2001
 
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
 
WD MEDIA, INC. (1)
5,679,473 Magnetic recording medium and method for its production 51 1995

Patent Citation Ranking

Forward Cite Landscape

Patent Info (Count) # Cites Year
 
KABUSHIKI KAISHA TOSHIBA (2)
7,470,474 Magnetic recording medium, production process thereof, and magnetic recording and reproducing apparatus including both oxide and non-oxide perpendicular magnetic layers 16 2004
7,867,638 Magnetic recording medium, method for producing thereof, and magnetic recording and reproducing apparatus 2 2008
 
SEAGATE TECHNOLOGY LLC (1)
7,691,499 Corrosion-resistant granular magnetic media with improved recording performance and methods of manufacturing same 0 2006
 
WD MEDIA (SINGAPORE) PTE. LTD. (1)
8,603,650 Perpendicular magnetic recording disk and manufacturing method thereof 0 2005

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