US3676870A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Single wall domain transfer circuit
Assignee: AT&T Inc
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Filing: 1971-05-13
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Granted: 1972-07-11
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Expires: 1991-05-13
Abstract
Abstract Single wall domains are moved in a layer of a host magnetic material in response to magnetic poles generated in channel defining elements in response to a magnetic field reorienting in the plane of the layer in what is called a ''''field access'''' mode of operation. Domains are transferred herein between channels, so defined, by the in-plane field when the originating and receiving positions for a domain at each transfer location are encompassed by a conductor loop which, when pulsed, defines a magnetic fence about the positions.
Inventors
- 👤 Andrew Henry Bobeck
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 11:44
CPC Classifications
G; G11; G11C; G11C19/00; G11C19/02; G11C19/08; G11C19/0875; G11C19/0883
Claims Analysis
Total Claims: 10
Claim 1
Independent Claim
127 words
A single wall domain transfer circuit comprising a layer of material in which single wall domains can be moved, a pattern of elements for defining in said material first and second propagation channels for said domains including first and second positions, respectively, for moving said domains in response to a magnetic field reorienting in the plane of said layer, an electrical conductor arrangement encompassing said first and second positions and providing thereabout a magnetic field for limiting the area of domain movement to said first and second positions when pulsed, said pattern including at least one element also encompassed by said conductor arrangement and responsive to said reorienting field for generating magnetic poles for moving domains from one to the other of said first and second positions.
Claim 2
Dependent Claim
127 words
A single wall domain transfer circuit comprising a layer of material in which single wall domains can be moved, a pattern of elements for defining in said material first and second propagation channels for said domains including first and second positions, respectively, for moving said domains in response to a magnetic field reorienting in the plane of said layer, an electrical conductor arrangement encompassing said first and second positions and providing thereabout a magnetic field for limiting the area of domain movement to said first and second positions when pulsed, said pattern including at least one element also encompassed by said conductor arrangement and responsive to said reorienting field for generating magnetic poles for moving domains from one to the other of said first and second positions.
Claim 3
Dependent Claim
23 words
A circuit in accordance with claim 1 wherein said pattern of elements comprises magnetically soft material juxtaposed with the surface of said layer.
Claim 4
Dependent Claim
64 words
A circuit in accordance with claim 2 wherein said first and second positions are defined by said overlay elements for occupation by a domain for first or second orientations of said in-plane field respectively, and means for pulsing said conductor arrangement for a time for said reorienting field to reorient from said first to said second or from said second to said first orientations.
Claim 5
Dependent Claim
32 words
A circuit in accordance with claim 3 wherein said conductor arrangement comprises a pair of closely spaced conductors of a geometry to separate further locally to encompass said first and second positions.
Claim 6
Dependent Claim
81 words
A circuit in accordance with claim 2 wherein said pattern of elements is of a geometry to define a plurality of said first channels oriented along a first dimension of said layer and a single second channel oriented along a second dimension, each of said plurality of channels being closely spaced from said second channel for defining a plurality of said first and second positions in pairs, said electrical conductor arrangement encompassing said pairs of positions being connected electrically in series.
Claim 7
Dependent Claim
23 words
A circuit in accordance with claim 5 also including means for providing a bias field for maintaining said domains at a prescribed diameter.
Claim 8
Dependent Claim
23 words
A circuit in accordance with claim 6 wherein said electrical conductor arrangement when pulsed locally expands domains at said first and second positions.
Claim 9
Dependent Claim
36 words
A circuit in accordance with claim 7 wherein said electrical conductor arrangement when pulsed expands a domain at each of said first and second positions to encompass the associated second or first position in each instance.
Claim 10
Dependent Claim
25 words
A circuit in accordance with claim 8 including means for terminating said pulse when said reorienting field next reorients to said first or second orientation.
References Cited (Backward Citations)
US3618054A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1975-07-11 | 1976-01-10 | 1976-07-11 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-07-11 | 1980-01-10 | 1980-07-11 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-07-11 | 1984-01-10 | 1984-07-11 | $7700.00 | Window Closed / Lapsed |