US Patent No: 6,608,737
Number of patents in Portfolio can not be more than 2000
Method to make a stitched writer for a giant magneto-resistive head
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Aug 19, 2003
Issued date -
Oct 8, 2002
filing date -
10/266,664
serial no -
Expired
status
Importance
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Abstract
A giant magneto-resistive head is provided which includes a novel high data-rate stitched pole inductive magnetic write head. The write head incorporates a non-magnetic spacer layer and a magnetic pole yoke that is recessed from the magnetic pole tip. The spacer layer shortens the throat height of the write head, reduces its saturation write current, and improves its overwrite and side erasure performance.
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First Claim
Related Publications
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International Classification(s)
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Cited Art
| Patent Info | (Count) | # Cites | Year |
|---|---|---|---|
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| 5,282,308 Thin film planarization process for fabricating magnetic heads employing a stitched pole structure | 30 | 1992 | |
| 5,898,548 Shielded magnetic tunnel junction magnetoresistive read head | 97 | 1997 | |
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| 5,283,942 Sacrificial layer planarization process for fabricating a narrow thin film inductive head | 56 | 1992 | |
| 5,375,023 Submicron thin film inductive head with self-aligned staggered pole-tips | 23 | 1992 | |
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| 5,446,613 Magnetic head assembly with MR sensor | 47 | 1994 | |
| 5,726,841 Thin film magnetic head with trimmed pole tips etched by focused ion beam for undershoot reduction | 63 | 1996 | |
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| 6,376,013 Multiple nozzles for dispensing resist | 25 | 1999 | |
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| 5,910,870 Magnetoresistive effect composite head with laminated magnetic layer isolated from magnetic pole layer | 9 | 1997 | |
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| 6,016,242 Narrow top poles for inductive magnetic heads, masks and processes for making the same | 4 | 1998 | |
Patent Citation Ranking
Maintenance Fees
| Fee | Large entity fee | small entity fee | micro entity fee | due date |
|---|---|---|---|---|
| 11.5 Year Payment | $7400.00 | $3700.00 | $1850.00 | Feb 19, 2015 |
| Fee | Large entity fee | small entity fee | micro entity fee |
|---|---|---|---|
| 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 |