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Patent US4542071A successfully refreshed from Google Patents.
US4542071A
Expired / Lapsed
US
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Lubricated magnetic recording disk
Assignee: International Business Machines Corp
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Filing: 1983-07-14
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Granted: 1985-09-17
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Expires: 2003-07-14
Abstract
Abstract A magnetic disk is lubricated by being overcoated first with a permanently bound monolayer of silica spheres about 7 nm in diameter and on top of said monolayer a skin-like film of amorphous silica about 2 to 13 nm thick.
Inventors
- 👤 Andrew M. Homola
- 👤 Heinrich Sussner
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 15:06
CPC Classifications
G; G11; G11B; G11B5/00; G11B5/62; G11B5/68; G11B5/70; G11B5/71; G11B5/72; G11B5/725
Claims Analysis
Total Claims: 3
Claim 1
Independent Claim
40 words
A magnetic recording disk characterized by a lubricant overcoat of a permanently bound monolayer of silica spheres about 7 nm in diameter, and on top of said monolayer a skin-like film of amorphous silica about 2 to 13 nm thick.
Claim 2
Dependent Claim
40 words
A magnetic recording disk characterized by a lubricant overcoat of a permanently bound monolayer of silica spheres about 7 nm in diameter, and on top of said monolayer a skin-like film of amorphous silica about 2 to 13 nm thick.
Claim 3
Dependent Claim
18 words
A disk as claimed in claim 1 wherein there are a plurality of skin-like films of amorphous silica.
References Cited (Backward Citations)
US2885366A
Cited
US4007314A
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US4320159A
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US4336310A
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US4280918A
Cited
JPS57167131A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1988-09-16 | 1989-03-18 | 1989-09-17 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1992-09-16 | 1993-03-18 | 1993-09-17 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1996-09-16 | 1997-03-18 | 1997-09-17 | $7700.00 | Window Closed / Lapsed |