US3713118A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Single wall domain fanout circuit
Assignee: AT&T Inc
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Filing: 1970-05-27
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Granted: 1973-01-23
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Expires: 1990-05-27
Abstract
Abstract An arrangement of magnetically soft overlay elements on a magnetic material, in which single wall domains can be moved, is designed to generate two domains for each domain advanced to it in response to a magnetic field reorienting in the plane of the material. A number of these arrangements are cascaded to perform a fanout function which doubles the number of domains for each cycle of the in-plane field.
Inventors
- 👤 I Danylchuk
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 20:28
CPC Classifications
G; G11; G11C; G11C19/00; G11C19/02; G11C19/08; G11C19/0858; H; H03; H03K; H03K3/00; H03K3/02; H03K3/45; H03K3/455
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
137 words
A magnetic domain fanout circuit comprising a material in which single wall domains can be moved, a magnetically soft overlay adjacent a surface of said material, means for generating a reorienting in-plane field for providing changing magnetic pole patterns in said overlay, said overlay defining first and second channels for single wall domains and an intersection therebetween, and a magnetically soft overlay at said intersection, said overlay at said intersection having a geometry for dividing into two a domain advanced to said intersection for movement along both of said channels thereafter in response to said in-plane field, said overlay at said intersection being operative to move a domain about the periphery thereof and also being of a geometry such that a domain so moved is eliminated from that periphery prior to the completion of one traversal thereof.
Claim 2
Dependent Claim
137 words
A magnetic domain fanout circuit comprising a material in which single wall domains can be moved, a magnetically soft overlay adjacent a surface of said material, means for generating a reorienting in-plane field for providing changing magnetic pole patterns in said overlay, said overlay defining first and second channels for single wall domains and an intersection therebetween, and a magnetically soft overlay at said intersection, said overlay at said intersection having a geometry for dividing into two a domain advanced to said intersection for movement along both of said channels thereafter in response to said in-plane field, said overlay at said intersection being operative to move a domain about the periphery thereof and also being of a geometry such that a domain so moved is eliminated from that periphery prior to the completion of one traversal thereof.
Claim 3
Dependent Claim
30 words
A circuit in accordance with claim 1 in which said overlay at said intersection is of a geometry to localize and then repel a domain moving about an element thereof.
Claim 4
Dependent Claim
58 words
A circuit in accordance with claim 2 wherein sAid overlay at said intersection comprises an element generally rectangular in shape and having a mouth portion therein and including a separate element extending into said mouth for providing a repulsion force for a domain moving about the periphery of said rectangular element once each cycle of said in-plane field.
Claim 5
Dependent Claim
22 words
A plurality of circuits in accordance with claim 3 and means for cascading said circuits into an n stage binary tree arrangement.
Claim 6
Dependent Claim
22 words
A circuit in accordance with claim 3 including means for selectively introducing domains to said generally rectangular overlay element at said intersection.
Claim 7
Dependent Claim
47 words
A circuit in accordance with claim 4 including means for selectively introducing domains to said generally rectangular overlay element at an intersection in a first stage of said binary tree and means for detecting the presence or absence of domains generated at intersections in said nth stage.
References Cited (Backward Citations)
US3523286A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1976-01-23 | 1976-07-24 | 1977-01-23 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-01-23 | 1980-07-24 | 1981-01-23 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-01-23 | 1984-07-24 | 1985-01-23 | $7700.00 | Window Closed / Lapsed |