US3641518A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Magnetic domain logic arrangement
Assignee: AT&T Inc
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Filing: 1970-09-30
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Granted: 1972-02-08
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Expires: 1990-09-30
Abstract
Abstract A single wall domain logic circuit arrangement is realized by a pair of magnetically soft rails on the surface of a material in which domains can be moved. The distance between the rails is reduced over a prescribed portion of the rails to define a position at which domains moving along both rails interact.
Inventors
- 👤 John Alexander Copeland
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 20:55
CPC Classifications
H; H03; H03K; H03K19/00; H03K19/02; H03K19/16; H03K19/168
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
146 words
A single wall domain logic circuit comprising a sheet of magnetic material in which single wall domains can be moved, first and second rails energy coupled to said sheet, each of said rails having properties and a first geometry to define laterally displaced stable positions for a domain to first and second sides thereof, means for generating in said sheet repetitive magnetic field patterns for moving domains from stage to stage along said rails, said first rail being spaced apart from said second rail a first distance at which repulsion forces exhibited between domains moving therealong produce only negligible effects, said first rail including a first portion spaced apart from said second rail a second distance less than said first distance such that said repulsion forces between associated domainS on said first and second rails change the lateral position of a domain on the second rail.
Claim 2
Dependent Claim
146 words
A single wall domain logic circuit comprising a sheet of magnetic material in which single wall domains can be moved, first and second rails energy coupled to said sheet, each of said rails having properties and a first geometry to define laterally displaced stable positions for a domain to first and second sides thereof, means for generating in said sheet repetitive magnetic field patterns for moving domains from stage to stage along said rails, said first rail being spaced apart from said second rail a first distance at which repulsion forces exhibited between domains moving therealong produce only negligible effects, said first rail including a first portion spaced apart from said second rail a second distance less than said first distance such that said repulsion forces between associated domainS on said first and second rails change the lateral position of a domain on the second rail.
Claim 3
Dependent Claim
18 words
A circuit in accordance with claim 1 wherein each of said rails comprises a magnetically soft overlay film.
Claim 4
Dependent Claim
18 words
A circuit in accordance with claim 1 wherein each of said rails comprises a groove in said sheet.
Claim 5
Dependent Claim
32 words
A circuit in accordance with claim 1 wherein said first portion of said first rail has a second geometry to permit the interaction forces between domains there to move a domain thereacross.
Claim 6
Dependent Claim
46 words
A circuit in accordance with claim 1 also including means for providing domains to said first and second sides of said first and second rails selectively and means for detecting the presence and absence of domains moved across said first rail because of said domain interaction.
Claim 7
Dependent Claim
18 words
A circuit in accordance with claim 2 wherein said first portion encompasses a single one of said stages.
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) | 1975-02-07 | 1975-08-09 | 1976-02-08 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-02-07 | 1979-08-09 | 1980-02-08 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-02-07 | 1983-08-09 | 1984-02-08 | $7700.00 | Window Closed / Lapsed |