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Patent US4305137A successfully refreshed from Google Patents.
US4305137A
Expired / Lapsed
US
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Planar magnetic bubble device
Assignee: Hitachi Ltd
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Filing: 1979-05-02
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Granted: 1981-12-08
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Expires: 1999-05-02
Abstract
Abstract The basic elements of a magnetic bubble device are laminated. A spacer conductor pattern layer is formed on the same plane as a control conductor pattern layer interposed between a magnetic film which forms and holds magnetic bubbles and a propagation circuit pattern layer adapted to control the magnetic bubbles so as to make substantially uniform the distance between the propagation path and the magnetic film.
Inventors
- 👤 Minoru Hiroshima
- 👤 Ryo Suzuki
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 17:18
CPC Classifications
H; H01; H01F; H01F10/00; H01F10/06; G; G11; G11C; G11C19/00; G11C19/02; G11C19/08; G11C19/0875; G11C19/0883
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
152 words
In a magnetic device comprising a monocrystalline substrate, a magnetic film formed on said substrate, said magnetic film being adapted to form and hold magnetic bubbles, an insulating film, a control conductor pattern layer including a hair pin shaped loop which passes current for controlling the magnetic bubbles, and a propagation path pattern layer including magnetic bubble propagation path segments, said layers being laminated on the surface of said magnetic film through said insulating film, the improvement which comprises a spacer conductor pattern layer interposed between said propagation path segments and said magnetic film, said spacer conductor pattern layer being formed on the same plane as said control conductor pattern layer for maintaining substantially constant the distance between said propagation path segments and said magnetic film and which further comprises an insulating layer formed along the contour of said conductor pattern layer for electrically insulating the same from said spacer pattern layer.
Claim 2
Dependent Claim
152 words
In a magnetic device comprising a monocrystalline substrate, a magnetic film formed on said substrate, said magnetic film being adapted to form and hold magnetic bubbles, an insulating film, a control conductor pattern layer including a hair pin shaped loop which passes current for controlling the magnetic bubbles, and a propagation path pattern layer including magnetic bubble propagation path segments, said layers being laminated on the surface of said magnetic film through said insulating film, the improvement which comprises a spacer conductor pattern layer interposed between said propagation path segments and said magnetic film, said spacer conductor pattern layer being formed on the same plane as said control conductor pattern layer for maintaining substantially constant the distance between said propagation path segments and said magnetic film and which further comprises an insulating layer formed along the contour of said conductor pattern layer for electrically insulating the same from said spacer pattern layer.
Claim 3
Dependent Claim
144 words
In a magnetic device comprising a monocrystalline substrate a magnetic film formed on said substrate, said magnetic film being adapted to form and hold magnetic bubbles, an insulating film, a control conductor pattern layer including a hair pin shaped loop which passes current for controlling the magnetic bubbles, and a propagation path pattern layer including magnetic bubble propagation path segments, said layers being laminated on the surface of said magnetic film through said insulating film, the improvement which comprises a spacer conductor pattern layer interposed between said propagation path segments and said magnetic film, said spacer conductor pattern layer being formed on the same plane as said control conductor pattern layer for maintaining substantially constant the distance between said propagation path segments and said magnetic film wherein a portion of said spacer conductor pattern layer is electrically connected to said control conductor pattern layer.
Claim 4
Dependent Claim
144 words
In a magnetic device comprising a monocrystalline substrate a magnetic film formed on said substrate, said magnetic film being adapted to form and hold magnetic bubbles, an insulating film, a control conductor pattern layer including a hair pin shaped loop which passes current for controlling the magnetic bubbles, and a propagation path pattern layer including magnetic bubble propagation path segments, said layers being laminated on the surface of said magnetic film through said insulating film, the improvement which comprises a spacer conductor pattern layer interposed between said propagation path segments and said magnetic film, said spacer conductor pattern layer being formed on the same plane as said control conductor pattern layer for maintaining substantially constant the distance between said propagation path segments and said magnetic film wherein a portion of said spacer conductor pattern layer is electrically connected to said control conductor pattern layer.
Claim 5
Dependent Claim
34 words
A magnetic bubble device according to claim 2 wherein said spacer conductor pattern layer is connected to a portion near the tip of said hair pin shaped loop of said control conductor pattern layer.
Claim 6
Dependent Claim
35 words
A magnetic bubble device according to claim 1, 1, 2 or 3 wherein said spacer conductor pattern layer and said control conductor pattern layer are made of the same material and have the same thickness.
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) | 1984-12-07 | 1985-06-08 | 1985-12-08 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1988-12-07 | 1989-06-08 | 1989-12-08 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1992-12-07 | 1993-06-08 | 1993-12-08 | $7700.00 | Window Closed / Lapsed |