Patent US4960609A successfully refreshed from Google Patents.
US4960609A
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Process for bonding lubricant to a thin film magnetic recording disk
Assignee: International Business Machines Corp
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Filing: 1989-11-13
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Granted: 1990-10-02
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Expires: 2009-11-13
Abstract
Abstract In the manufacture of a thin film metal alloy or metal oxide magnetic recording disk, a fluoroether lubricant is bonded to the carbon or hydrogenated carbon overcoat of the disk. The lubricant is applied to the carbon overcoat by dipping the disk in a solution of the lubricant. The lubricated disk is then exposed to the plasma of an inert gas, such as nitrogen. The resulting disk contains a layer of lubricant which is bonded to the disk surface so as to be resistant to spin-off and which has a relatively uniform thickness so as to substantially eliminate the problems of stiction during the operation of the disk file.
Inventors
- 👤 Andrew M. Homola
- 👤 Li-Ju J. Lin
- 👤 David D. Saperstein
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 13:30
CPC Classifications
G; G11; G11B; G11B5/00; G11B5/62; G11B5/72; G11B5/725; G11B5/7253; G11B5/7257; G11B5/726; G11B5/7262; G11B5/7264; G11B5/7266; Y; Y10; Y10S; Y10S428/00; Y10S428/90
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
54 words
A process for bonding a fluoroether lubricant to a thin film magnetic recording disk of the type having a protective overcoat consisting essentially of carbon, the process comprising the steps of: applying a fluoroether lubricant to the carbon overcoat surface; and thereafter exposing the lubricated disk to a plasma of an essentially inert gas.
Claim 2
Dependent Claim
54 words
A process for bonding a fluoroether lubricant to a thin film magnetic recording disk of the type having a protective overcoat consisting essentially of carbon, the process comprising the steps of: applying a fluoroether lubricant to the carbon overcoat surface; and thereafter exposing the lubricated disk to a plasma of an essentially inert gas.
Claim 3
Dependent Claim
33 words
The process according to claim 1 wherein the step of exposing the lubricated disk to an essentially inert gas plasma comprises the step of exposing the lubricated disk to a nitrogen gas plasma.
Claim 4
Dependent Claim
30 words
The process according to claim 1 wherein the step of applying the fluoroether lubricant comprises the step of dipping the carbon overcoated disk into a solution containing the fluoroether lubricant.
Claim 5
Dependent Claim
26 words
The process according to claim 1 further comprising the step of, after exposing the lubricated disk to the plasma, removing the unbonded lubricant from the disk.
Claim 6
Dependent Claim
26 words
The process according to claim 1 wherein the step of applying the fluoroether lubricant comprises the step of applying a difunctional derivative of a perfluoropolyether lubricant.
Claim 7
Dependent Claim
23 words
The process according to claim 1 wherein the step of applying the fluoroether lubricant comprises the step of applying a non-reactive perfluoropolyether lubricant.
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) | 1993-10-01 | 1994-04-02 | 1994-10-02 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1997-10-01 | 1998-04-02 | 1998-10-02 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2001-10-01 | 2002-04-02 | 2002-10-02 | $7700.00 | Window Closed / Lapsed |