US4228523A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Conductor access bubble memory arrangement
Assignee: AT&T Inc
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Filing: 1979-03-08
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Granted: 1980-10-14
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Expires: 1999-03-08
Abstract
Abstract Continuous film type, current-access bubble memories are designed for low power operation by including, along the current paths, areas of reduced width. The areas of reduced widths are characterized by relatively high current densities, which are preferred, for example, for expansion detected or operation, without an increase in power consumption.
Inventors
- 👤 Andrew H. Bobeck
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 16:19
CPC Classifications
G; G11; G11C; G11C19/00; G11C19/02; G11C19/08; G11C19/0808; G11C19/0841; G11C19/0866
Claims Analysis
Total Claims: 12
Claim 1
Independent Claim
138 words
A magnetic bubble memory comprising a host layer (11) of a material in which magnetic bubbles can be moved, and means (16,17,M 1 . . . M N ,13,22) for moving magnetic bubbles in the layer, the means comprising at least one continuous layer (16) of electrically-conducting material for providing a current path for pulses (see FIG. 3) impressed therein and means (M 1 . . . M N and 13) for defining a periodic pattern of magnetic field gradients in response to the pulses, the memory being characterized in that the overall width of the current path is sufficiently different in at least first and second areas (to the left of line 30 and to the right of line 31 in FIG. 1) to provide substantially different current densities in response to each of the current pulses.
Claim 2
Dependent Claim
138 words
A magnetic bubble memory comprising a host layer (11) of a material in which magnetic bubbles can be moved, and means (16,17,M 1 . . . M N ,13,22) for moving magnetic bubbles in the layer, the means comprising at least one continuous layer (16) of electrically-conducting material for providing a current path for pulses (see FIG. 3) impressed therein and means (M 1 . . . M N and 13) for defining a periodic pattern of magnetic field gradients in response to the pulses, the memory being characterized in that the overall width of the current path is sufficiently different in at least first and second areas (to the left of line 30 and to the right of line 31 in FIG. 1) to provide substantially different current densities in response to each of the current pulses.
Claim 3
Dependent Claim
37 words
A magnetic bubble memory in accordance with claim 1 also including a second layer of electrically-conducting material, said second layer also having areas of different widths corresponding to the areas of different widths of said first layer.
Claim 4
Dependent Claim
49 words
A magnetic bubble memory in accordance with claim 2 wherein said first and second areas of each of said layer of electrically conducting material are separated by a transition area in which current density changes from a low to a relatively high level in response to said current pulses.
Claim 5
Dependent Claim
41 words
A magnetic bubble memory in accordance with claim 3 wherein said means for moving magnetic bubbles comprises associated patterns of apertures in said first and second layers for generating changing patterns of localized field gradients in response to said current pulses.
Claim 6
Dependent Claim
47 words
A magnetic bubble memory in acordance with claim 4 wherein said patterns of apertures defined closed-loop paths for circulating bubbles thereabout, wherein at least one of said closed path is a major loop operative to move bubbles in said first and second areas and said transition area.
Claim 7
Dependent Claim
26 words
A magnetic bubble memory in accordance with claim 5 wherein said major loop includes an expander-detector arrangement in said second area of relatively high current density.
Claim 8
Dependent Claim
26 words
A magnetic bubble memory in accordance with claim 6 wherein said major loop also includes a generator in said first area of relatively low current density.
Claim 9
Dependent Claim
32 words
A magnetic bubble memory in accordance with claim 7 wherein the remaining ones of said closed loops define minor loop and are positioned in said first area of relatively low current density.
Claim 10
Dependent Claim
33 words
A magnetic bubble memory in accordance with claim 8 also including means for controllably moving bubble patterns between said major and said minor paths in said first area of relatively low current density.
Claim 11
Dependent Claim
86 words
A magnetic bubble memory comprising a host layer of a material in which magnetic bubbles can be moved, and at least a first layer of electrically-conducting material coupled to said host layer and adapted for providing a current path in said first layer, said first layer including therein an area in which the width of said current path is reduced from relatively wide to narrow, said area including apertures arranged in a partial sunburst pattern having ends relatively close together where said current path is narrow.
Claim 12
Dependent Claim
86 words
A magnetic bubble memory comprising a host layer of a material in which magnetic bubbles can be moved, and at least a first layer of electrically-conducting material coupled to said host layer and adapted for providing a current path in said first layer, said first layer including therein an area in which the width of said current path is reduced from relatively wide to narrow, said area including apertures arranged in a partial sunburst pattern having ends relatively close together where said current path is narrow.
References Cited (Backward Citations)
US3693177A
Cited
US4064496A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1983-10-14 | 1984-04-14 | 1984-10-14 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1987-10-14 | 1988-04-14 | 1988-10-14 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1991-10-14 | 1992-04-14 | 1992-10-14 | $7700.00 | Window Closed / Lapsed |