Patent US4001892A successfully refreshed from Google Patents.
US4001892A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Contaminant trapping in rotating disk devices
Assignee: Xerox Corp
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Filing: 1975-03-17
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Granted: 1977-01-04
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Expires: 1995-03-17
Abstract
Abstract An apparatus for removing contaminant particles from an enclosure containing a rotating magnetic disk by using the air flow created by rotation of the disk. A tacky substance is provided at a point of maximum centrifugal force within the enclosure so that contaminant particles are permanently captured. Means can be provided for refreshing the tacky substance.
Inventors
- 👤 Vittorio Castelli
- 👤 Stephen T. Chai
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 23:33
CPC Classifications
G; G11; G11B; G11B23/00; G11B23/50; G11B23/505
Claims Analysis
Total Claims: 3
Claim 1
Independent Claim
278 words
A data storage system providing an ambient fluid free of contaminant particles comprising: a magnetic disk supported for rotation about a spindle and having at least one surface capable of storing information, a housing for enclosing said magnetic disk, the interior side surface of said housing being proximate the periphery of said magnetic disk, at least a portion of said interior side surface of said housing being curved relative to the axial direction of said spindle, said housing being fluid tight when said data storage system is in operation such that the ambient fluid within said housing remains the same when said data storage system is in operation, means for rotating said magnetic disk, rotation of said magnetic disk producing a centrifugal force within said housing which force causes the ambient fluid and any contaminant particles carried thereby to flow past the outer periphery of said at least one surface of said magnetic disk and past said portion of said interior side surface of said housing, said centrifugal force being greatest adjacent said portion of said interior side surface of said housing due to said portion of said side surface of said housing being curved relative to the axial direction of said spindle, and a tacky substance deposited on at least a portion of said portion of said interior side surface of said housing, the action of the centrifugal force produced by rotation of said magnetic disk causing contaminant particles carried by the ambient fluid within said housing to be flung against said tacky substance as said ambient fluid within said housing moves past said tacky substance whereby said contaminant particles are permanently captured by said tacky substance.
Claim 2
Dependent Claim
278 words
A data storage system providing an ambient fluid free of contaminant particles comprising: a magnetic disk supported for rotation about a spindle and having at least one surface capable of storing information, a housing for enclosing said magnetic disk, the interior side surface of said housing being proximate the periphery of said magnetic disk, at least a portion of said interior side surface of said housing being curved relative to the axial direction of said spindle, said housing being fluid tight when said data storage system is in operation such that the ambient fluid within said housing remains the same when said data storage system is in operation, means for rotating said magnetic disk, rotation of said magnetic disk producing a centrifugal force within said housing which force causes the ambient fluid and any contaminant particles carried thereby to flow past the outer periphery of said at least one surface of said magnetic disk and past said portion of said interior side surface of said housing, said centrifugal force being greatest adjacent said portion of said interior side surface of said housing due to said portion of said side surface of said housing being curved relative to the axial direction of said spindle, and a tacky substance deposited on at least a portion of said portion of said interior side surface of said housing, the action of the centrifugal force produced by rotation of said magnetic disk causing contaminant particles carried by the ambient fluid within said housing to be flung against said tacky substance as said ambient fluid within said housing moves past said tacky substance whereby said contaminant particles are permanently captured by said tacky substance.
Claim 3
Dependent Claim
14 words
The system of claim 1 wherein said tacky substance is a high vacuum grease.
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) | 1980-01-04 | 1980-07-05 | 1981-01-04 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1984-01-04 | 1984-07-05 | 1985-01-04 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1988-01-04 | 1988-07-05 | 1989-01-04 | $7700.00 | Window Closed / Lapsed |