US3602911A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Single wall magnetic domain propagation arrangement
Assignee: AT&T Inc
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Filing: 1969-12-23
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Granted: 1971-08-31
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Expires: 1989-12-23
Abstract
Abstract Apparatus for moving a single wall domain utilizing the finite mobility of the domain in a sheet of magnetic material is described. The domain is moved by changing pole patterns in a magnetically soft overlay in response to alternate slow and fast reversals of the in-plane field component aligned with the direction of domain movement.
Inventors
- 👤 Arjeh J Kurtzig
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 06:15
CPC Classifications
G; G11; G11C; G11C19/00; G11C19/02; G11C19/08; G11C19/0808; G11C19/0816
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
76 words
A magnetic domain propagation arrangement comprising a material in which a single wall domain can be moved and having a first surface, a magnetically soft overlay adjacent said surface, said overlay comprising a plurality of elements aligned with an axis between input and output positions, means for generating a first in-plane field along said axis, and means for reversing said first in-plane field alternately at slow and fast rates for advancing said domain along said axis.
Claim 2
Dependent Claim
76 words
A magnetic domain propagation arrangement comprising a material in which a single wall domain can be moved and having a first surface, a magnetically soft overlay adjacent said surface, said overlay comprising a plurality of elements aligned with an axis between input and output positions, means for generating a first in-plane field along said axis, and means for reversing said first in-plane field alternately at slow and fast rates for advancing said domain along said axis.
Claim 3
Dependent Claim
20 words
An arrangement in accordance with claim 1 also including means for generating a second in-plane field perpendicular to said axis.
Claim 4
Dependent Claim
20 words
An arrangement in accordance with claim 2 wherein said first in-plane field is large compared to said second in-plane field.
Claim 5
Dependent Claim
64 words
An arrangement in accordance with claim 3 wherein said element is a disc and said fast rate is fast with respect to (R/ Mu Delta H) where R is the radius of said disc, xi is the mobility of a domain in said material, and Delta H is the difference between the field at the leading and at the trailing edges of said domain.
Claim 6
Dependent Claim
20 words
An arrangement in accordance with claim 4 where said slow rate is slow with respect to (R/ Mu Delta H).
References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1974-08-30 | 1975-03-01 | 1975-08-31 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-08-30 | 1979-03-01 | 1979-08-31 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-08-30 | 1983-03-01 | 1983-08-31 | $7700.00 | Window Closed / Lapsed |