US4031526A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Magnetic bubble domain detection device
Assignee: Boeing North American Inc
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Filing: 1976-05-24
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Granted: 1977-06-21
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Expires: 1996-05-24
Abstract
Abstract A magnetic bubble domain device including a magnetoresistive element for detecting the presence of bubble domains which are stretched in a direction orthogonal to the propagation direction of the bubble domains.
Inventors
- 👤 John L. Archer
- 👤 Leonard R. Tocci
- 👤 Jeffrey L. Williams
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 06:39
CPC Classifications
G; G11; G11C; G11C19/00; G11C19/02; G11C19/08; G11C19/0866
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
135 words
A magnetic device comprising, a magnetic film capable of maintaining isolated domains therein wherein said domains have different magnetic polarization than said film, a plurality of magnetizable areas on said magnetic film for controlling the position of said isolated domains in said film, at least some of said plurality of magnetizable areas arranged adjacent to each other for expanding said isolated domains in a direction different from the direction of motion of said domains through said magnetic film, and detector means adjacent to said magnetizable areas for detecting the presence of an expanded isolated domain at said magnetizable areas, said detector means including a single magnetoresistive element the resistance of which varies as a function of the proximity of said expanded isolated domain, said magnetizable areas disposed on said magnetic film under said detector means.
Claim 2
Dependent Claim
135 words
A magnetic device comprising, a magnetic film capable of maintaining isolated domains therein wherein said domains have different magnetic polarization than said film, a plurality of magnetizable areas on said magnetic film for controlling the position of said isolated domains in said film, at least some of said plurality of magnetizable areas arranged adjacent to each other for expanding said isolated domains in a direction different from the direction of motion of said domains through said magnetic film, and detector means adjacent to said magnetizable areas for detecting the presence of an expanded isolated domain at said magnetizable areas, said detector means including a single magnetoresistive element the resistance of which varies as a function of the proximity of said expanded isolated domain, said magnetizable areas disposed on said magnetic film under said detector means.
Claim 3
Dependent Claim
55 words
The magnetic device recited in claim 1 including, first magnetic field producing means disposed adjacent to said magnetic film for permitting the establishment of said isolated domains in said magnetic film, and second magnetic field producing means disposed adjacent to said magnetic device for controlling the motion of said isolated domains through said magnetic film.
Claim 4
Dependent Claim
42 words
The magnetic device recited in claim 1 wherein said magnetizable areas are arranged in a prescribed pattern and selectively exhibit magnetic poles whereby said isolated domains are controllably attracted to said poles and moved relative to said preselected pattern of magnetizable areas.
Claim 5
Dependent Claim
25 words
The magnetic device recited in claim 1 wherein said magnetizable areas include a substantially V-shaped portion and, said magnetizable areas are arranged in parallel relationship.
Claim 6
Dependent Claim
23 words
The magnetic device recited in claim 4 wherein said magnetoresistive element is disposed adjacent an end region of each of said magnetizable areas.
Claim 7
Dependent Claim
23 words
The magnetic device recited in claim 4 wherein said magnetoresistive element is disposed adjacent the apex region of each of said magnetizable areas.
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) | 1980-06-20 | 1980-12-20 | 1981-06-21 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1984-06-20 | 1984-12-20 | 1985-06-21 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1988-06-20 | 1988-12-20 | 1989-06-21 | $7700.00 | Window Closed / Lapsed |