US3689210A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Apparatus for producing a magnetic return structure
Assignee: Siemens AG
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Filing: 1971-02-16
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Granted: 1972-09-05
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Expires: 1991-02-16
Abstract
Abstract A magnetic return structure having a system of control lines for use in a magnetic storer and apparatus for producing the same. A parallel series of conductors are applied to both sides of a foil of insulating material and a keeper composition is applied to the exposed foil and conductors in a manner that eliminates any air gaps therebetween without producing undesirable mechanical disruptions of the system.
Inventors
- 👤 Karl-Ulrich Stein
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 11:43
CPC Classifications
H; H01; H01F; H01F10/00; H01F10/06; B; B29; B29C; B29C39/00; H01F7/00; H01F7/02; H01F7/0205; H01F7/021; H01F7/0215
Claims Analysis
Total Claims: 3
Claim 1
Independent Claim
159 words
An apparatus for the production of a flexible keeper in intimate unseparated attachment with a magnetic storage layer comprising, a receptacle having an open top for receiving a system of control lines and a fluid-like keeper material, a gaspermeable cover plate fitting said open top and being superimposed onto the fluid-like keeper material, a gasimpermeable pressure plate adapted for mounting above said cover plate and being movable in response to pressure variations, said pressure plate having a plurality of projections extending from a surface thereof, said projections being in pressure-transmitting contact with said cover plate and defining free space between said cover plate and said pressure plate, a vacuum source, a vapor passage means providing communication between said free space and said vacuum source, and a seal means providing a vapors seal between said pressure plate and said receptacle whereby vacuum is applied to said free space causing application of pressure on said cover plate and fluid-like keeper material.
Claim 2
Independent Claim
159 words
An apparatus for the production of a flexible keeper in intimate unseparated attachment with a magnetic storage layer comprising, a receptacle having an open top for receiving a system of control lines and a fluid-like keeper material, a gaspermeable cover plate fitting said open top and being superimposed onto the fluid-like keeper material, a gasimpermeable pressure plate adapted for mounting above said cover plate and being movable in response to pressure variations, said pressure plate having a plurality of projections extending from a surface thereof, said projections being in pressure-transmitting contact with said cover plate and defining free space between said cover plate and said pressure plate, a vacuum source, a vapor passage means providing communication between said free space and said vacuum source, and a seal means providing a vapors seal between said pressure plate and said receptacle whereby vacuum is applied to said free space causing application of pressure on said cover plate and fluid-like keeper material.
Claim 3
Dependent Claim
45 words
The apparatus as defined in claim 1, wherein the pressure plate is composed of a shim member having a plurality of projections extending from a surface thereof and a flexible closure member superimposed on said shim member and being movable in response to pressure variations.
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) | 1975-09-05 | 1976-03-06 | 1976-09-05 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-09-05 | 1980-03-06 | 1980-09-05 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-09-05 | 1984-03-06 | 1984-09-05 | $7700.00 | Window Closed / Lapsed |