US Patent No: 7,468,864
Number of patents in Portfolio can not be more than 2000
Magnetic head for perpendicular magnetic recording and method of manufacturing same
Stats
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Dec 23, 2008
Issued date -
Jul 1, 2004
filing date -
10/880,509
serial no -
In Force
status
Importance
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Abstract
A pole layer has an end located in a medium facing surface, the end having: a first side close to a substrate; a second side located opposite to the first side; a third side connecting an end of the first side to an end of the second side; and a fourth side connecting the other end of the first side to the other end of the second side. The second side defines a track width. The end of the pole layer located in the medium facing surface has a width that decreases toward the first side. The pole layer is disposed in a groove of a pole-layer-encasing layer made of a nonmagnetic insulating material, with a nonmagnetic conductive film provided between the encasing layer and the pole layer. The pole layer incorporates: a first layer located closer to the surface of the groove; and a second layer located farther from the surface of the groove.
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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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| 6,104,574 Magnetic head with a magnetic pole sandwiched between conductive materials | 12 | 1998 | |
| 6,710,973 Single pole type recording head including tapered edges | 52 | 2001 | |
| 7,006,326 Single pole type recording head with tapered edges | 18 | 2004 | |
| 6,891,697 Magnetic heads for perpendicular recording and magnetic recording disk apparatus using the same | 15 | 2004 | |
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| 6,836,957 Method for making perpendicular magnetic recording head having inverted trapezoidal main magnetic pole layer | 16 | 2001 | |
| 6,952,867 Method for manufacturing perpendicular magnetic recording head having inverted trapezoidal main magnetic pole layer | 18 | 2001 | |
| 7,206,166 Thin film magnetic head and method of manufacturing the same | 10 | 2003 | |
| 2004/0184,191 Thin film magnetic head | 7 | 2003 | |
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| 6,809,899 Magnetic heads for perpendicular recording with trapezoidal pole tips | 34 | 2003 | |
| 7,239,478 Write element for perpendicular recording in a data storage system | 15 | 2004 | |
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| 7,251,103 Perpendicular pole having and adjacent non-magnetic CMP resistant structure | 3 | 2004 | |
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| 6,950,277 Concave trailing edge write pole for perpendicular recording | 44 | 2002 | |
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| 4,656,546 Vertical magnetic recording arrangement | 141 | 1985 | |
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| 6,504,675 Perpendicular magnetic recording heads with write pole shaped to reduce skew effects during writing | 127 | 2001 | |
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| 4,672,493 Thin-film magnetic head with a double gap for a recording medium to be magnetized vertically | 78 | 1985 | |
Patent Citation Ranking
Maintenance Fees
| Fee | Large entity fee | small entity fee | micro entity fee | due date |
|---|---|---|---|---|
| 7.5 Year Payment | $3600.00 | $1800.00 | $900.00 | Jun 23, 2016 |
| 11.5 Year Payment | $7400.00 | $3700.00 | $1850.00 | Jun 23, 2020 |
| 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 |