Patent US4250528A successfully refreshed from Google Patents.
US4250528A
Expired / Lapsed
US
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Magnetic disc recording apparatus
Assignee: Mitsubishi Electric Corp
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Filing: 1979-03-29
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Granted: 1981-02-10
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Expires: 1999-03-29
Abstract
Abstract A magnetic disc recording apparatus comprises flow control partitions disposed near peripheral parts of rotary magnetic discs whereby air involved between magnetic discs or between magnetic disc groups is controlled.
Inventors
- 👤 Hiroyasu Oda
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 20:23
CPC Classifications
G; G11; G11B; G11B23/00; G11B23/50; G11B23/505
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
166 words
A magnetic disc recording apparatus, comprising: a plurality of magnetic discs, said discs being rotatably mounted one above another on a rotatable spindle; a plurality of magnetic heads for communicating with said discs, said heads floating on said discs; an air-tight chamber surrounding said plurality of discs and said plurality of magnetic heads; means for filtering pressurized air entering said chamber; a plurality of air flow control partitions located within said air-tight chamber, each of said partitions including a circular opening having a diameter slightly larger than the diameter of one of said magnetic discs, said partitions being positioned within said chamber such that each of said partitions is coplanar with one of said discs and such that said circular opening in said partition is concentric with said one of said discs; wherein air flowing between said plurality of discs is controlled by said partitions, whereby dust particles occurring between any two of said discs are prevented from contaminating the remainder of said plurality of discs.
Claim 2
Dependent Claim
166 words
A magnetic disc recording apparatus, comprising: a plurality of magnetic discs, said discs being rotatably mounted one above another on a rotatable spindle; a plurality of magnetic heads for communicating with said discs, said heads floating on said discs; an air-tight chamber surrounding said plurality of discs and said plurality of magnetic heads; means for filtering pressurized air entering said chamber; a plurality of air flow control partitions located within said air-tight chamber, each of said partitions including a circular opening having a diameter slightly larger than the diameter of one of said magnetic discs, said partitions being positioned within said chamber such that each of said partitions is coplanar with one of said discs and such that said circular opening in said partition is concentric with said one of said discs; wherein air flowing between said plurality of discs is controlled by said partitions, whereby dust particles occurring between any two of said discs are prevented from contaminating the remainder of said plurality of discs.
Claim 3
Dependent Claim
27 words
A magnetic disc recording apparatus as recited in claim 1, wherein: one of said plurality of partitions is disposed adjacent to each of said plurality of discs.
Claim 4
Dependent Claim
27 words
A magnetic disc recording apparatus as recited in claim 1, wherein: one of said plurality of partitions is associated with a group of said plurality of discs.
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) | 1984-02-10 | 1984-08-11 | 1985-02-10 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1988-02-10 | 1988-08-11 | 1989-02-10 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1992-02-10 | 1992-08-11 | 1993-02-10 | $7700.00 | Window Closed / Lapsed |