US3797001A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Single wall domain propagation arrangement
Assignee: AT&T Inc
•
Filing: 1972-08-07
•
Granted: 1974-03-12
•
Expires: 1992-08-07
Abstract
Abstract Field access, single wall domain propagation arrangements include channels defined by embossed permalloy layers. Lower drive fields and increased design flexibility result.
Inventors
- 👤 Ssu Chen Yu
- 👤 J Geusic
- 👤 T Nelson
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 11:24
CPC Classifications
G; G11; G11C; G11C19/00; G11C19/02; G11C19/08; G11C19/0875; G11C19/0883; G11C19/0808; G11C19/0816
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
79 words
Magnetic apparatus comprising a first layer of material in which single wall domains can be moved, and means for moving domains along a channel in said layer, said means comprising a second layer of magnetically soft material coupled to said first layer and a first pattern of magnetically soft elements mechanically integral with said second layer at a first face thereof for moving domains therealong in response to a magnetic field reorienting in the plane of said first layer.
Claim 2
Dependent Claim
79 words
Magnetic apparatus comprising a first layer of material in which single wall domains can be moved, and means for moving domains along a channel in said layer, said means comprising a second layer of magnetically soft material coupled to said first layer and a first pattern of magnetically soft elements mechanically integral with said second layer at a first face thereof for moving domains therealong in response to a magnetic field reorienting in the plane of said first layer.
Claim 3
Dependent Claim
26 words
Apparatus in accordance with claim 1 also including a second pattern of magnetically soft elements mechanically integral with said second layer at a second face thereof.
Claim 4
Dependent Claim
18 words
Apparatus in accordance with claim 2 also including a nonmagnetic spacing layer between said first and second layers.
Claim 5
Dependent Claim
20 words
Apparatus in accordance with claim 3 wherein said spacing layer is embossed to mate with said second pattern of elemEnts.
Claim 6
Dependent Claim
37 words
Apparatus in accordance with claim 4 wherein said elements of said first and second patterns are of geometries and are so disposed to cooperate to move domains along a channel defined thereby responsive to said magnetic field.
Claim 7
Dependent Claim
24 words
Apparatus in accordance with claim 2 wherein said second layer is of a thickness to saturate magnetically in the presence of said magnetic field.
Claim 8
Dependent Claim
19 words
Apparatus in accordance with claim 6 wherein said pattern of magnetically soft elements is exchange-coupled to said second layer.
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) | 1977-03-11 | 1977-09-10 | 1978-03-12 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-03-11 | 1981-09-10 | 1982-03-12 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-03-11 | 1985-09-10 | 1986-03-12 | $7700.00 | Window Closed / Lapsed |