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

ALSO PUBLISHED AS: 20040137277

Stats

ATTORNEY / AGENT: (SPONSORED)

Importance

Loading Importance Indicators... loading....

Abstract

See full text

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.

Loading the Abstract Image... loading....

First Claim

See full text

all claims..

Related Publications

Loading Related Publications... loading....

Patent Owner(s)

Patent OwnerAddressTotal Patents
SHOWA DENKO K.K.TOKYO1813
KABUSHIKI KAISHA TOSHIBATOKYO39845

International Classification(s)

  • [Classification Symbol]
  • [Patents Count]

Inventor(s)

Inventor Name Address # of filed Patents Total Citations
Hikosaka, Takashi Tokyo, JP 69 408
Iwasaki, Takeshi Kawasaki, JP 179 896
Nakamura, Futoshi Kawasaki, JP 58 245
Oikawa, Soichi Kawasaki, JP 103 498
Sakai, Hiroshi Kariya, JP 344 1902
Sakawaki, Akira Ichihara, JP 114 318
Shimizu, Kenji Ichihara, JP 192 641

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 92 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 56 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 19 2004
7,867,638 Magnetic recording medium, method for producing thereof, and magnetic recording and reproducing apparatus 3 2008
 
SEAGATE TECHNOLOGY LLC (2)
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
 
WD MEDIA (SINGAPORE) PTE. LTD. (1)
8,603,650 Perpendicular magnetic recording disk and manufacturing method thereof 2 2005

Maintenance Fees

Fee Large entity fee small entity fee micro entity fee due date
7.5 Year Payment $3600.00 $1800.00 $900.00 May 7, 2014
11.5 Year Payment $7400.00 $3700.00 $1850.00 May 7, 2018
Fee Large entity fee small entity fee micro entity fee
Surcharge - 7.5 year - Late payment within 6 months $160.00 $80.00 $40.00
Surcharge - 11.5 year - Late payment within 6 months $160.00 $80.00 $40.00
Surcharge after expiration - Late payment is unavoidable $700.00 $350.00 $175.00
Surcharge after expiration - Late payment is unintentional $1,640.00 $820.00 $410.00