US Patent No: 4,717,622

Number of patents in Portfolio can not be more than 2000

Magnetic recording media

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Abstract

A magnetic recording medium has a protective layer made of high hardness carbon synthesized under a low-temperature and a low-pressure by blowing hydrocarbon gas plasma onto a magnetic recording layer. The resistance thereof is large, and therefore, high density magnetic recording can be realized in a magnetic recording system wherein the magnetic head contacts the magnetic recording medium. Durability of the magnetic recording medium is substantially improved.

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First Claim

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Patent Owner(s)

Patent OwnerAddressTotal Patents
MATSUSHITA ELECTRIC INDUSTRIAL CO., LTD.OSAKA27275

International Classification(s)

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  • [Patents Count]

Inventor(s)

Inventor Name Address # of filed Patents Total Citations
Kurokawa, Hideo Katano, JP 38 542
Mitani, Tsutomu Akashi, JP 33 390
Yonezawa, Taketoshi Osaka, JP 12 359

Cited Art

Patent Info (Count) # Cites Year
 
ASAHI KOMAG CO., LTD. (1)
4,411,963 Thin film recording and method of making 72 1981
 
XEBEC, INC. (1)
4,503,125 Protective overcoating for magnetic recording discs and method for forming the same 70 1981

Patent Citation Ranking

Forward Cites

Patent Info (Count) # Cites Year
 
CARDINAL CG COMPANY (14)
6,964,731 Soil-resistant coating for glass surfaces 14 1999
6,974,629 Low-emissivity, soil-resistant coating for glass surfaces 9 1999
6,660,365 Soil-resistant coating for glass surfaces 15 2000
6,939,446 Soil-resistant coating for glass surfaces 1 2003
7,294,403 Soil-resistant coating for glass surfaces 0 2004
7,491,301 Methods and apparatuses for depositing film on both sides of a pane 0 2004
7,294,404 Graded photocatalytic coatings 9 2004
8,092,660 Methods and equipment for depositing hydrophilic coatings, and deposition technologies for thin films 0 2005
7,713,632 Low-maintenance coatings 4 2005
7,604,865 Low-maintenance coatings 5 2005
7,923,114 Hydrophilic coatings, methods for depositing hydrophilic coatings, and improved deposition technology for thin films 0 2005
7,989,094 Opposed functional coatings having comparable single surface reflectances 0 2007
RE44155 Low-maintenance coatings 0 2011
RE43817 Low-maintenance coatings 0 2011
 
SEMICONDUCTOR ENERGY LABORATORY CO., LTD. (14)
5,190,824 Electrostatic-erasing abrasion-proof coating 30 1991
6,207,281 Electrostatic-erasing abrasion-proof coating and method for forming the same 16 1993
5,637,373 Magnetic recording medium 19 1993
6,165,582 Magnetic recording medium 11 1997
5,989,672 Magnetic recording medium 27 1997
5,871,847 Electrostatic-erasing abrasion-proof coating and method for forming the same 10 1997
6,194,047 Magnetic recording medium 23 1997
6,265,070 Electrostatic-erasing abrasion-proof coating and method for forming the same 10 1998
6,805,941 Magnetic recording medium 4 1999
6,623,836 Magnetic recording medium 3 1999
6,583,481 Electrostatic-erasing abrasion-proof coating and method for forming the same 5 2001
7,144,629 Electrostatic-erasing abrasion-proof coating and method for forming the same 0 2003
7,083,873 Magnetic recording medium including a diamond-like carbon protective film with hydrogen and at least two additional elements 4 2003
7,391,592 Magnetic recording medium including a diamond-like carbon protective film and at least two additional elements 0 2006
 
APPLIED MATERIALS, INC. (8)
6,423,384 HDP-CVD deposition of low dielectric constant amorphous carbon film 27 1999
6,573,030 Method for depositing an amorphous carbon layer 217 2000
6,841,341 Method of depositing an amorphous carbon layer 22 2002
6,852,647 Removable amorphous carbon CMP stop 12 2003
7,223,526 Method of depositing an amorphous carbon layer 10 2004
7,148,156 Removable amorphous carbon CMP stop 1 2005
7,507,677 Removable amorphous carbon CMP stop 2 2006
7,335,462 Method of depositing an amorphous carbon layer 2 2007
 
MATSUSHITA ELECTRIC INDUSTRIAL CO., LTD. (4)
5,110,676 Magnetic recording medium incorporating metallic magnetic thin film 26 1990
5,364,690 Magnetic recording medium comprising a ferromagnetic metal film and two carbon protective layers 31 1992
5,451,427 Magnetic recording medium and method of producing the same 7 1993
5,443,888 Magnetic recording medium having a carbon protective layer and partially fluorinated alkyl carboxylic acid lubricant layer 13 1993
 
3M INNOVATIVE PROPERTIES COMPANY (3)
6,203,898 Article comprising a substrate having a silicone coating 25 1997
6,348,237 Jet plasma process for deposition of coatings 16 2001
7,189,436 Flash evaporation-plasma coating deposition method 1 2004
 
WD MEDIA, INC. (3)
5,227,211 Magnetic recording disk medium comprising a magnetic thin film and a carbon overcoat having surface nitrogen atoms, a specified carbon structure, and oxygen atoms 39 1991
5,567,512 Thin carbon overcoat and method of its making 43 1993
5,679,431 Sputtered carbon overcoat in a thin-film medium and sputtering method 36 1994
 
CANON KABUSHIKI KAISHA (2)
4,897,829 Cardlike optical recording medium 23 1987
5,132,173 Magnetic recording medium having a silicon oxide protective layer with an electrical specific resistance of from 3.3.times.10.sup.13 to 5.0.times..sup.15 ohm.cm 11 1990
 
INTERNATIONAL BUSINESS MACHINES CORPORATION (2)
5,470,661 Diamond-like carbon films from a hydrocarbon helium plasma 177 1993
5,569,501 Diamond-like carbon films from a hydrocarbon helium plasma 41 1995
 
EMTEC MAGNETICS GMBH (1)
4,891,114 Magnetic recording media 2 1987
 
FUJI ELECTRIC CO., LTD. (1)
5,614,314 Magnetic recording medium having an enhanced diamond bonding ratio and a method for the manufacture thereof 11 1993
 
HITACHI GLOBAL STORAGE TECHNOLOGIES JAPAN, LTD. (1)
5,500,296 Magnetic recording medium, process for producing magnetic recording medium, apparatus for producing magnetic recording medium, and magnetic recording apparatus 16 1994
 
HITACHI, LTD. (1)
5,275,850 Process for producing a magnetic disk having a metal containing hard carbon coating by plasma chemical vapor deposition under a negative self bias 44 1991
 
MINNESOTA MINING AND MANUFACTURING COMPANY (1)
5,464,667 Jet plasma process and apparatus 58 1994
 
SEAGATE TECHNOLOGY LLC (1)
5,945,191 Multi-phase carbon overcoats for magnetic discs 17 1997
 
SHOWA DENKO K.K. (1)
6,132,875 Magnetic recording medium and magnetic head having carbon protective layers 10 1996
 
THE BOARD OF TRUSTEES OF THE LELAND STANFORD JUNIOR UNIVERSITY (1)
4,898,748 Method for enhancing chemical reactivity in thermal plasma processes 16 1988
 
THE UNITED STATES OF AMERICA AS REPRESENTED BY THE SECRETARY OF THE NAVY (1)
5,075,094 Method of growing diamond film on substrates 30 1990
 
UNITED MODULE CORPORATION (1)
5,470,447 Method for applying a protective coating on a magnetic recording head 5 1994
 
UNIVERSITY OF LOUISVILLE RESEARCH FOUNDATION, INC. (1)
7,964,013 FeRh-FePt core shell nanostructure for ultra-high density storage media 0 2009
 
OTHER [CHECK PATENT PROFILE FOR ASSIGNMENT INFORMATION] (1)
6,649,246 Magnetic recording medium 1999