Patent US3673582A successfully refreshed from Google Patents.
US3673582A
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Bubble domain sonic propagation device
Assignee: RCA Corp
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Filing: 1971-05-17
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Granted: 1972-06-27
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Expires: 1991-05-17
Abstract
Abstract A single wall magnetic domain or bubble is advanced in a sheet of magnetic material such as an orthoferrite by means of a sonic stress wave propagated through a contiguous channel-defining member of anisotropic, magnetostrictive material such as permalloy. A sonic stress wave propagated through the permalloy member causes a propagated region in which the direction of magnetization in the permalloy is partially rotated. The propagated region of rotated magnetization urges the magnetic bubble in the same direction along a path in the orthoferrite.
Inventors
- 👤 Richmond Bennett Clover Jr
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 10:12
CPC Classifications
G; G11; G11C; G11C19/00; G11C19/02; G11C19/08; G11C19/0808; G11C19/0816
Claims Analysis
Total Claims: 10
Claim 1
Independent Claim
51 words
In combination, a sheet of magnetic material in which single wall domains can be moved, magnetic means contiguous with said sheet to define a propagation channel in the sheet for said domains, and means to propagate a sonic stress wave through said magnetic means to propagate domains along said propagation channel.
Claim 2
Dependent Claim
51 words
In combination, a sheet of magnetic material in which single wall domains can be moved, magnetic means contiguous with said sheet to define a propagation channel in the sheet for said domains, and means to propagate a sonic stress wave through said magnetic means to propagate domains along said propagation channel.
Claim 3
Dependent Claim
24 words
The combination of claim 1 wherein said sheet comprises a material having a preferred direction of magnetization normal to the plane of the sheet.
Claim 4
Dependent Claim
26 words
The combination as defined in claim 1 wherein said magnetic means comprises an anisotropic magnetic material having a preferred direction of magnetization parallel with said sheet.
Claim 5
Dependent Claim
13 words
The combination as defined in claim 1 wherein said magnetic means is permalloy.
Claim 6
Dependent Claim
20 words
The combination as defined in claim 1 wherein said channel-defining magnetic means includes periodic irregularities defining successive domain arresting points.
Claim 7
Dependent Claim
43 words
The combination as defined in claim 1 wherein said means to propagate a sonic stress wave through said magnetic means comprises a stress wave conductor in intimate physical contact with said magnetic means, and an electro-mechanical transducer mounted on said stress wave conductor.
Claim 8
Dependent Claim
22 words
The combination as defined in claim 6 wherein said magnetic means is a permalloy magnetic film deposited on said stress wave conductor.
Claim 9
Dependent Claim
27 words
The combination as defined in claim 1 and, in addition, means including electric current conductors to supply magnetic domain bubbles to one end of said propagation channel.
Claim 10
Dependent Claim
31 words
The combination as defined in claim 1 and, in addition, means including electric current conductors to sense the presence of magnetic domain bubbles arriving at a point along said propagation channel.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1975-06-27 | 1975-12-27 | 1976-06-27 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-06-27 | 1979-12-27 | 1980-06-27 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-06-27 | 1983-12-27 | 1984-06-27 | $7700.00 | Window Closed / Lapsed |