Patent US5159508A successfully refreshed from Google Patents.
US5159508A
Expired / Lapsed
US
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Magnetic head slider having a protective coating thereon
Assignee: HGST Netherlands BV
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Filing: 1990-12-27
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Granted: 1992-10-27
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Expires: 2010-12-27
Abstract
Abstract A magnetic head slider having a protective coating on the rails thereof, the protective coating comprising a thin adhesion layer and a thin layer of amorphous hydrogenated carbon. The protective coating is deposited on the air bearing surface of the slider after the thin film magnetic heads are lapped to a chosen dimension, but before the pattern of rails is produced on the air bearing surface. The protective coating protects the magnetic head during the rail fabrication process and in usage in a magnetic recording system protects the magnetic head from wear and corrosion damage.
Inventors
- 👤 Alfred Grill
- 👤 Cheng T. Horng
- 👤 Bernard S. Meyerson
- 👤 Vishnubhai V. Patel
- 👤 Michael A. Russak
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 10:35
CPC Classifications
G; G11; G11B; G11B5/00; G11B5/48; G11B5/58; G11B5/60; G11B5/6005; G11B5/127; G11B5/31; G11B5/3103; G11B5/3106; G11B5/6082; Y; Y10; Y10T; Y10T29/00; Y10T29/49; Y10T29/49002; Y10T29/4902; Y10T29/49021; Y10T29/49032; Y10T29/49036; Y10T29/49041
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
54 words
A magnetic head slider for supporting a magnetic head comprising; a slider structure having leading and trailing ends and an air bearing surface; a patterned area on said air bearing surface, said patterned area having a protective coating thereon, said coating comprising a thin adhesion layer and a thin layer of amorphous hydrogenated carbon.
Claim 2
Dependent Claim
54 words
A magnetic head slider for supporting a magnetic head comprising; a slider structure having leading and trailing ends and an air bearing surface; a patterned area on said air bearing surface, said patterned area having a protective coating thereon, said coating comprising a thin adhesion layer and a thin layer of amorphous hydrogenated carbon.
Claim 3
Dependent Claim
16 words
The magnetic head slider of claim 1 wherein said patterned area includes at least one rail.
Claim 4
Dependent Claim
13 words
The magnetic head slider of claim 2 wherein said adhesion layer comprises silicon.
Claim 5
Dependent Claim
18 words
The magnetic head slider of claim 3 wherein the thickness of said adhesion layer is about 10-50 angstroms.
Claim 6
Dependent Claim
20 words
The magnetic head slider of claim 4 wherein the thickness of said protective coating is about 250 angstroms or less.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1995-10-27 | 1996-04-27 | 1996-10-27 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1999-10-27 | 2000-04-27 | 2000-10-27 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2003-10-27 | 2004-04-27 | 2004-10-27 | $7700.00 | Window Closed / Lapsed |