US3753814A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Confinement of bubble domains in film-substrate structures
Assignee: Boeing North American Inc
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Filing: 1970-12-28
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Granted: 1973-08-21
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Expires: 1990-12-28
Abstract
Abstract This invention described a method which controls the presence of bubble domains near the edge of a magnetic film in a filmsubstrate structure. The magnetic film is etched with a suitable etchant, for example boiling phosphoric acid, to provide a smooth, well-defined edge. The newly formed edge of the film repels the bubble domains therefrom thereby causing the bubble domains to be confined substantially to the center of the strip of film or to the center of the film disc.
Inventors
- 👤 G Pulliam
- 👤 P Besser
- 👤 J Mee
- 👤 D Heinz
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-22 21:20
CPC Classifications
G; G11; G11C; G11C19/00; G11C19/02; G11C19/08; G11C19/0808; G11C19/0833; H; H01; H01F; H01F10/00
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
51 words
A method of confining bubble domains in a magnetic film of bubble domain material applied on a substrate comprising the steps of etching the film perpendicularly to provide a smooth, well-defined edge whereby bubble domains are repelled from said edge of said film by complete removal of said original edge material.
Claim 2
Dependent Claim
15 words
A method as described in claim 2 whereby said film is etched with phosphoric acid.
Claim 3
Dependent Claim
16 words
A method as described in claim 2 whereby said film is etched by a sputtering technique.
Claim 4
Independent Claim
54 words
A method of preventing unwanted bubble domain nucleation in a magnetic film of bubble domain material applied on a substrate comprising the steps of removing completely the origninal edge of the film to provide a smooth, well-defined edge whereby the imperfections associated with the original edge that cause uncontrolled nucleation are no longer present.
Claim 5
Independent Claim
55 words
A method of preventing unwanted bubble domain nucleation in a magnetic film of bubble domain material applied on a substrate comprising the steps of etching the film to provide a smooth, well-defined edge whereby the imperfections associated with the original edge that cause uncontrolled nucleation are no longer present by completely removing said original edge.
Claim 6
Dependent Claim
15 words
A method as described in claim 6 whereby said film is etched with phosphoric acid.
Claim 7
Dependent Claim
16 words
A method as described in claim 6 whereby said film is etched by a sputtering technique.
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) | 1976-08-20 | 1977-02-19 | 1977-08-21 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-08-20 | 1981-02-19 | 1981-08-21 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-08-20 | 1985-02-19 | 1985-08-21 | $7700.00 | Window Closed / Lapsed |