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.TOKYO1125
KABUSHIKI KAISHA TOSHIBATOKYO26017

International Classification(s)

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Inventor(s)

Inventor Name Address # of filed Patents Total Citations
Hikosaka, Takashi Tokyo, JP 45 474
Iwasaki, Takeshi Funabashi, JP 150 1138
Nakamura, Futoshi Ichikawa, JP 40 328
Oikawa, Soichi Chiba, JP 65 834
Sakai, Hiroshi Ichihara, JP 253 2388
Sakawaki, Akira Ichihara, JP 69 440
Shimizu, Kenji Ichihara, JP 146 967

Cited Art Landscape

Patent Info (Count) # Cites Year
 
WD MEDIA, INC. (1)
* 5,679,473 Magnetic recording medium and method for its production 67 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 44 1989
* 5,851,643 Magnetic recording media and magnetic recording read-back system which uses such media 97 1997
 
FUJI ELECTRIC CO., LTD. (1)
* 2002/0018,917 Perpendicular magnetic recording medium 18 2001
* Cited By Examiner

Patent Citation Ranking

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Patent Info (Count) # Cites Year
 
SEAGATE TECHNOLOGY LLC (4)
* 2006/0286,413 Magnetic caplayers for corrosion improvement of granular perpendicular recording media 19 2005
* 7,691,499 Corrosion-resistant granular magnetic media with improved recording performance and methods of manufacturing same 3 2006
* 8,728,637 Corrosion resistant granular magnetic stack 1 2010
* 2010/0119,877 CORROSION-RESISTANT GRANULAR MAGNETIC MEDIA WITH IMPROVED RECORDING PERFORMANCE AND METHODS OF MANUFACTURING SAME 4 2010
 
KABUSHIKI KAISHA TOSHIBA (5)
* 7,470,474 Magnetic recording medium, production process thereof, and magnetic recording and reproducing apparatus including both oxide and non-oxide perpendicular magnetic layers 25 2004
* 2006/0204,791 Magnetic recording medium, method for producing thereof, and magnetic recording and reproducing apparatus 27 2004
* 7,867,638 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 7 2008
* 2009/0201,607 Patterned perpendicular magnetic recording medium and magnetic recording and reproducing apparatus 1 2009
 
WD MEDIA (SINGAPORE) PTE. LTD. (2)
* 8,603,650 Perpendicular magnetic recording disk and manufacturing method thereof 52 2005
* 2007/0148,499 Perpendicular magnetic recording disk and manufacturing method thereof 5 2005
* Cited By Examiner

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