US3638205A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Magnetic domain propagation arrangement
Assignee: AT&T Inc
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Filing: 1970-06-29
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Granted: 1972-01-25
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Expires: 1990-06-29
Abstract
Abstract A single electrical conductor to which an AC signal is applied causes oscillation of a single wall domain in a substrate of magnetic material in which such domains can be moved. The presence of a DC current in auxiliary conductors to either side converts the oscillation to displacement along the axis of the single conductor. A reversal of the polarity of the DC currents reverses the direction of displacement of domains.
Inventors
- 👤 John Alexander Copeland
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 04:15
CPC Classifications
G; G11; G11C; G11C19/00; G11C19/02; G11C19/08; G11C19/0808; G11C19/0841
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
91 words
A domain propagation arrangement comprising a slice of material in which single wall domains can be moved, and means for defining in said slice a channel for domain movement, said means comprising a symmetrical serpentine first conductor aligned along said channel, means for providing an AC current in said first conductor for generating a first periodic energy configuration along said channel, and means for selectively generating in said channel a second periodic energy configuration offset with respect to said first configuration for moving domains in a first direction in said channel.
Claim 2
Dependent Claim
91 words
A domain propagation arrangement comprising a slice of material in which single wall domains can be moved, and means for defining in said slice a channel for domain movement, said means comprising a symmetrical serpentine first conductor aligned along said channel, means for providing an AC current in said first conductor for generating a first periodic energy configuration along said channel, and means for selectively generating in said channel a second periodic energy configuration offset with respect to said first configuration for moving domains in a first direction in said channel.
Claim 3
Dependent Claim
35 words
A domain propagation arrangement in accordance with claim 1 wherein said last-mentioned means comprises second and third conductors on first and second sides of said first conductor, and a DC source connected to said conductors.
Claim 4
Dependent Claim
41 words
An arrangement in accordance with claim 2 wherein said first, second and third conductors bear a periodic relationship to one another to produce in said slice an asymmetric energy condition for incrementally displacing domains for each alternation of said AC current.
Claim 5
Dependent Claim
34 words
An arrangement in accordance with claim 3 wherein said central one of said conductors has a first period and each of said second and third conductors has a second period twice said first period.
Claim 6
Dependent Claim
25 words
An arrangement in accordance with claim 4 wherein said slice is characterized by a preferred direction of magnetization normal to the plane of said slice.
Claim 7
Dependent Claim
27 words
An arrangement in accordance with claim 5 also including means for selectively providing said domains in said channel and means for selectively detecting domains in said channel.
Claim 8
Dependent Claim
39 words
An arrangement in accordance with claim 2 wherein said DC source is reversible for generating second and third periodic energy configurations offset with respect to said first configuration for moving domains in first and second directions in said channel.
References Cited (Backward Citations)
US3518643A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1975-01-24 | 1975-07-26 | 1976-01-25 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-01-24 | 1979-07-26 | 1980-01-25 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-01-24 | 1983-07-26 | 1984-01-25 | $7700.00 | Window Closed / Lapsed |