Patent US4251841A successfully refreshed from Google Patents.
US4251841A
Expired / Lapsed
US
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Magnetic head slider assembly
Assignee: International Business Machines Corp
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Filing: 1979-06-01
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Granted: 1981-02-17
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Expires: 1999-06-01
Abstract
Abstract A magnetic head slider is formed from a mixture of Al 2 O 3 and TiC, having a fine grain composition of average particle size less than 5 microns. The ratio of aluminum oxide to titanium carbide of the mixture is in the range of 60-80% to 40-20%. The ceramic head slider has lower porosity and improved machining and wear characteristics.
Inventors
- 👤 Walter G. Jacobs
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 22:03
CPC Classifications
C; C04; C04B; C04B35/00; C04B35/01; C04B35/10; C04B35/111; C04B35/117; G; G11; G11B; G11B5/00; G11B5/127; G11B5/31; G11B5/3103; G11B5/3106; G11B5/48; G11B5/58; G11B5/60; G11B5/6005
Claims Analysis
Total Claims: 3
Claim 1
Independent Claim
140 words
An improved low porosity magnetic head slider comprising: a head slider formed from a composition of Al 2 O 3 and TiC, said slider having an air bearing surface, and leading and trailing ends relative to motion of a data track; at least one thin film transducer deposited at the trailing end and at the air bearing surface; rails extending from the leading to trailing ends along the air bearing surface; said composition having a ratio in the range of 60-80% Al 2 O 3 to 40-20% TiC by weight, respectively; wherein said composition consists of fine grain particles of aluminum oxide and titanium carbide each having an average size less than 5 microns, so as to minimize porosity problems by precluding voids, discontinuities and deformation of said thin film transducer deposited at said air bearing surface of said slider.
Claim 2
Dependent Claim
140 words
An improved low porosity magnetic head slider comprising: a head slider formed from a composition of Al 2 O 3 and TiC, said slider having an air bearing surface, and leading and trailing ends relative to motion of a data track; at least one thin film transducer deposited at the trailing end and at the air bearing surface; rails extending from the leading to trailing ends along the air bearing surface; said composition having a ratio in the range of 60-80% Al 2 O 3 to 40-20% TiC by weight, respectively; wherein said composition consists of fine grain particles of aluminum oxide and titanium carbide each having an average size less than 5 microns, so as to minimize porosity problems by precluding voids, discontinuities and deformation of said thin film transducer deposited at said air bearing surface of said slider.
Claim 3
Dependent Claim
29 words
A magnetic head slider as in claim 1, wherein said composition consists of particles of aluminum oxide and titanium carbide having an average size between 1 to 2 microns.
References Cited (Backward Citations)
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1984-02-17 | 1984-08-18 | 1985-02-17 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1988-02-17 | 1988-08-18 | 1989-02-17 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1992-02-17 | 1992-08-18 | 1993-02-17 | $7700.00 | Window Closed / Lapsed |