US3573771A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Flexible disc magnetic storage device
Assignee: International Business Machines Corp
•
Filing: 1969-04-21
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Granted: 1971-04-06
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Expires: 1989-04-21
Abstract
Abstract A flexible disc magnetic storage device in which the sole return path for the pumped air is provided through the side of the disc remote from the backer plate, thus permitting the disc to operate in an enclosed controlled environment.
Inventors
- 👤 Henry H Cockrell Jr
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 18:27
CPC Classifications
G; G11; G11B; G11B17/00; G11B17/32; G11B23/00; G11B23/50; G11B23/505; G11B5/00; G11B5/74; G11B5/82; G11B5/825
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
131 words
A magnetic data storage device suitable for operation in a restrictive enclosure comprising: a flexible magnetic disc; drive means for supporting and rotating said disc; backer pLate means spaced from one side of said disc and defining a fluid passage between the backer plate means and the confronting disc surface, said backer plate means being substantially impervious to fluids, transducer means mounted on said backer plate means for coacting with said flexible magnetic disc for inserting and retrieving information on said disc; and means for providing fluid communication between a first region defined by the confronting surfaces of the disc and the backer plate means and a second region defined, in part, by the other surface of the flexible disc said means being centrally located with respect to the disc periphery.
Claim 2
Dependent Claim
131 words
A magnetic data storage device suitable for operation in a restrictive enclosure comprising: a flexible magnetic disc; drive means for supporting and rotating said disc; backer pLate means spaced from one side of said disc and defining a fluid passage between the backer plate means and the confronting disc surface, said backer plate means being substantially impervious to fluids, transducer means mounted on said backer plate means for coacting with said flexible magnetic disc for inserting and retrieving information on said disc; and means for providing fluid communication between a first region defined by the confronting surfaces of the disc and the backer plate means and a second region defined, in part, by the other surface of the flexible disc said means being centrally located with respect to the disc periphery.
Claim 3
Dependent Claim
39 words
A magnetic storage device as set forth in claim 1 in which the means for providing fluid communications between the first and second region comprises at least one opening formed in the disc radially inward of the disc periphery.
Claim 4
Dependent Claim
40 words
A magnetic storage device as set forth in claim 1 in which the means for providing fluid communications between the first and second region comprises conduit means formed within the drive means for connecting the said first and second regions.
Claim 5
Dependent Claim
131 words
A magnetic data storage device comprising: a flexible magnetic disc; drive means for supporting and rotating said disc; backer plate means spaced from one side of said disc and defining a first region between the surfaces of the backer plate means and the confronting surface of the disc said backer plate means being substantially impervious to fluids; transducer means mounted on said backer plate means for coacting with said flexible magnetic disc for inserting and retrieving information on said disc; cover means coacting with said backer plate means to form a restrictive enclosure surrounding said disc; and means for providing fluid communication between said first region and a second region defined in part by the other surface of the disc said means being centrally located with respect to the disc periphery.
Claim 6
Dependent Claim
131 words
A magnetic data storage device comprising: a flexible magnetic disc; drive means for supporting and rotating said disc; backer plate means spaced from one side of said disc and defining a first region between the surfaces of the backer plate means and the confronting surface of the disc said backer plate means being substantially impervious to fluids; transducer means mounted on said backer plate means for coacting with said flexible magnetic disc for inserting and retrieving information on said disc; cover means coacting with said backer plate means to form a restrictive enclosure surrounding said disc; and means for providing fluid communication between said first region and a second region defined in part by the other surface of the disc said means being centrally located with respect to the disc periphery.
Claim 7
Dependent Claim
39 words
A magnetic storage device as set forth in claim 4 in which the means for providing fluid communications between the first and second region comprises at least one opening formed in the disc radially inward of the disc periphery.
Claim 8
Dependent Claim
40 words
A magnetic storage device as set forth in claim 4 in which the means for providing fluid communications between the first and second region comprises conduit means formed within the drive means for connecting the said first and second regions.
References Cited (Backward Citations)
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1974-04-05 | 1974-10-05 | 1975-04-06 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-04-05 | 1978-10-05 | 1979-04-06 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-04-05 | 1982-10-05 | 1983-04-06 | $7700.00 | Window Closed / Lapsed |