Patent US5270888A successfully refreshed from Google Patents.
US5270888A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Composite slider head with reduced readback oscillation
Assignee: Applied Magnetics Corp
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Filing: 1992-02-21
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Granted: 1993-12-14
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Expires: 2012-02-21
Abstract
Abstract The readback oscillations from a ceramic-ferrite composite head are substantially reduced by applying a dampening material, such as an epoxy coating, to the surface of the slider body--preferably to one or both side edges or to the trailing edge of the slider body.
Inventors
- 👤 Craig Collisson
- 👤 Tom Tuchscherer
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 10:51
CPC Classifications
G; G11; G11B; G11B5/00; G11B5/10; G11B5/105; G11B5/127; G11B5/133; G11B5/48; G11B5/58; G11B5/60; G11B5/6005
Claims Analysis
Total Claims: 20
Claim 1
Independent Claim
57 words
A composite head comprising a ceramic slider body receiving a single crystal ferrite core exhibiting readback oscillation voltage following a write current, the improvement comprising: a thin coating of a dampening material secured to and covering at least 10% of the surface of the slider body in an amount sufficient to substantially reduce said readback oscillation voltage.
Claim 2
Dependent Claim
57 words
A composite head comprising a ceramic slider body receiving a single crystal ferrite core exhibiting readback oscillation voltage following a write current, the improvement comprising: a thin coating of a dampening material secured to and covering at least 10% of the surface of the slider body in an amount sufficient to substantially reduce said readback oscillation voltage.
Claim 3
Dependent Claim
21 words
A composite head according to claim 1 in which the voltage of the readback oscillation is reduced by at least 20%
Claim 4
Dependent Claim
33 words
A composite head according to claim 1 in which the dampening material has a coefficient of thermal expansion differing by no more than 20% from the coefficient of expansion of the slider body.
Claim 5
Dependent Claim
20 words
A composite head according to claim 1 in which the dampening material is selected from adhesive tapes or organic resins.
Claim 6
Dependent Claim
18 words
A composite head according to claim 4 in which the dampening material is a coating of organic resin.
Claim 7
Dependent Claim
28 words
A composite head according to claim 4 in which the dampening material is present on the surface of the slider in an amount of at least 0.05 grams.
Claim 8
Dependent Claim
21 words
A composite head according to claim 6 in which the material is a thermoset resin that cures to a non-tacky condition.
Claim 9
Dependent Claim
26 words
A composite head according to claim 4 in which the coating of dampening material is present on at least one side edge of the slider body.
Claim 10
Dependent Claim
24 words
A composite head according to claim 8 in which a coating of dampening material is present on both sides edges of the slider body.
Claim 11
Dependent Claim
24 words
A composite head according to claim 8 in which the coating of dampening material is present on the trailing edge of the slider body.
Claim 12
Independent Claim
71 words
A method of reducing the readback oscillation voltage after a write current in a composite head formed of a ceramic slider body containing a single crystal ferrite core comprising the step of: applying to a surface of the slider body a thin coating of a dampening material covering at least 10% of the surface of the slider body in an amount sufficient to reduce readback oscillation voltage by at least 20%.
Claim 13
Independent Claim
71 words
A method of reducing the readback oscillation voltage after a write current in a composite head formed of a ceramic slider body containing a single crystal ferrite core comprising the step of: applying to a surface of the slider body a thin coating of a dampening material covering at least 10% of the surface of the slider body in an amount sufficient to reduce readback oscillation voltage by at least 20%.
Claim 14
Dependent Claim
32 words
A method according to claim 11 in which the dampening material has a thermal coefficient of expansion differing by no more than 20% from the thermal coefficient of expansion of the slider.
Claim 15
Dependent Claim
15 words
A method according to claim 11 in which the dampening material is an organic resin.
Claim 16
Dependent Claim
30 words
A method according to claim 13 in which the resin is curable when applied and further including the step of curing the resin on the surface of the slider body.
Claim 17
Dependent Claim
30 words
A method according to claim 11 in which the coating of dampening material is present on the surface of the slider body in an amount of at least 0.05 grams.
Claim 18
Dependent Claim
22 words
A method according to claim 15 in which the material is present on at least one side edge of the slider body.
Claim 19
Dependent Claim
23 words
A method according to claim 16 in which a coating of dampening material is present on both side edges of the slider body.
Claim 20
Dependent Claim
23 words
A method according to claim 11 in which the coating of dampening material is present on the trailing edge of the slider body.
References Cited (Backward Citations)
US4768121A
Cited
US4905111A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1996-12-13 | 1997-06-14 | 1997-12-14 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 2000-12-13 | 2001-06-14 | 2001-12-14 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2004-12-13 | 2005-06-14 | 2005-12-14 | $7700.00 | Window Closed / Lapsed |