Magnetic recording head with non-conformal side shield gap
Number of patents in Portfolio can not be more than 2000
United States of America Patent
Stats
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Oct 29, 2013
Grant Date -
Sep 19, 2013
app pub date -
Mar 13, 2012
filing date -
Mar 13, 2012
priority date (Note) -
In Force
status (Latency Note)
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Abstract
A magnetic write head having a shield structure that provides both a leading shield and side shielding function. The magnetic shield is separated from the sides and leading edge of the write pole by a non-magnetic gap layer that has a non-uniform thickness. The non-magnetic gap layer is thicker near the leading edge and thinner at the trailing edge. This allows for increased side field gradient near the trailing edge of the write pole and decreased write field loss at the leading edge of the write pole.
First Claim
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Family
- No Family data available.
- 15 United States
- 10 France
- 8 Japan
- 7 China
- 5 Korea
- 2 Other
Patent Owner(s)
Patent Owner | Address | |
---|---|---|
WESTERN DIGITAL TECHNOLOGIES INC | 3355 MICHELSON DRIVE SUITE 100 IRVINE CA 92612 |
International Classification(s)
Inventor(s)
Inventor Name | Address | # of filed Patents | Total Citations |
---|---|---|---|
Eto, Kimitoshi | Odawara, JP | 4 | 41 |
# of filed Patents : 4 Total Citations : 41 | |||
Hashimoto, Junichi | Kanagawa, JP | 250 | 1782 |
# of filed Patents : 250 Total Citations : 1782 | |||
Hosomi, Kazuhiko | Fujisawa, JP | 24 | 465 |
# of filed Patents : 24 Total Citations : 465 | |||
Kanai, Misuzu | Odawara, JP | 7 | 83 |
# of filed Patents : 7 Total Citations : 83 | |||
Kudo, Kazue | Odawara, JP | 46 | 303 |
# of filed Patents : 46 Total Citations : 303 | |||
Sugiyama, Mikito | Odawara, JP | 40 | 601 |
# of filed Patents : 40 Total Citations : 601 |
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Patent Citation Ranking
- 13 Citation Count
- G11B Class
- 64.24 % this patent is cited more than
- 12 Age
Forward Cite Landscape
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Maintenance Fees
Fee | Large entity fee | small entity fee | micro entity fee | due date |
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11.5 Year Payment | $7400.00 | $3700.00 | $1850.00 | Apr 29, 2025 |
Fee | Large entity fee | small entity fee | micro entity fee |
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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 |
Full Text

Legal Events
Date | Code | Event | Description |
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Mar 10, 2025 | PD | Priority Date | |
May 13, 2019 | LAPS | LAPSE FOR FAILURE TO PAY MAINTENANCE FEES | free format text: PATENT EXPIRED FOR FAILURE TO PAY MAINTENANCE FEES (ORIGINAL EVENT CODE: EXP.); ENTITY STATUS OF PATENT OWNER: MICROENTITY |
May 13, 2019 | STCH | INFORMATION ON STATUS: PATENT DISCONTINUATION | free format text: PATENT EXPIRED DUE TO NONPAYMENT OF MAINTENANCE FEES UNDER 37 CFR 1.362 |
Apr 07, 2019 | FP | EXPIRED DUE TO FAILURE TO PAY MAINTENANCE FEE | Effective Date: Apr 07, 2019 |
Nov 26, 2018 | FEPP | FEE PAYMENT PROCEDURE | free format text: MAINTENANCE FEE REMINDER MAILED (ORIGINAL EVENT CODE: REM.); ENTITY STATUS OF PATENT OWNER: MICROENTITY |
Apr 07, 2015 | I | Issuance | |
Mar 18, 2015 | STCF | INFORMATION ON STATUS: PATENT GRANT | free format text: PATENTED CASE |
Jan 22, 2014 | F | Filing |

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