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
Stats
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Nov 7, 2006
Issued date -
Jul 25, 2003
filing date -
10/626,837
serial no -
In Force
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Importance
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Abstract
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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First Claim
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International Classification(s)
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Cited Art
| Patent Info | (Count) | # Cites | Year |
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| 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 | 88 | 1997 | |
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| 5,478,661 Magnetic recording medium and method for its production | 17 | 1993 | |
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| 2002/0018,917 Perpendicular magnetic recording medium | 16 | 2001 | |
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| 5,792,564 Perpendicular recording medium and magnetic recording apparatus | 18 | 1995 | |
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| 5,665,468 Magneto-optical recording medium | 17 | 1994 | |
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| 5,679,473 Magnetic recording medium and method for its production | 47 | 1995 | |
Patent Citation Ranking
Maintenance Fees
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