Patent US3717853A successfully refreshed from Google Patents.
US3717853A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Magnetic bubble domain system
Assignee: Boeing North American Inc
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Filing: 1971-04-01
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Granted: 1973-02-20
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Expires: 1991-04-01
Abstract
Abstract A magnetic bubble domain system having localized areas of bubble domain spatial stability of a particular shape which have a preferred unidirectional movement for bubble domains is disclosed. The bubble domain system includes a thin film of single crystal magnetic bubble domain material on a single crystal substrate. The film has a plurality of isolated thick portions with a truncated shape surrounded by relatively thin regions which serve as energy barriers to the movement of bubble domains and which confine the bubble domains in the relatively thick portions. The truncated shaped thick portions have a narrow end and a wide end. Moving a bubble domain from the wide end of one thick portion to the narrow end of another portion takes place along the preferred ''''easy'''' movement direction. Moving a bubble domain along the ''''hard'''' movement direction from the narrow end of one portion to the wide end of another thick portion requires a larger force than along the easy movement direction.
Inventors
- 👤 Donnell C O
- 👤 G Pulliam
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 13:07
CPC Classifications
G; G11; G11C; G11C19/00; G11C19/02; G11C19/08; G11C19/0808; G11C19/0825
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
168 words
A magnetic bubble domain system having localized areas of bubble domain stability adapted to provide a unidirectional preferred movement for bubble domains comprising a substrate, a thin film of magnetic bubble domain material on said substrate, a first portion of said film having a first thickness, said first portion having a truncated shape including a narrow end and a wide end, said first portion being surrounded by a first region of said film having a thickness less than said first portion, and a second portion of said film having a second thickness, said second portion having a truncated shape including a narrow end and a wide end, said second portion being surrounded by a second region of film having a thickness less than said second portion, said second portion being in spaced relation with said first portion wherein a bubble domain may be moved from said first portion through said wide end of said first portion to said second portion through said narrow end of said second portion.
Claim 2
Dependent Claim
168 words
A magnetic bubble domain system having localized areas of bubble domain stability adapted to provide a unidirectional preferred movement for bubble domains comprising a substrate, a thin film of magnetic bubble domain material on said substrate, a first portion of said film having a first thickness, said first portion having a truncated shape including a narrow end and a wide end, said first portion being surrounded by a first region of said film having a thickness less than said first portion, and a second portion of said film having a second thickness, said second portion having a truncated shape including a narrow end and a wide end, said second portion being surrounded by a second region of film having a thickness less than said second portion, said second portion being in spaced relation with said first portion wherein a bubble domain may be moved from said first portion through said wide end of said first portion to said second portion through said narrow end of said second portion.
Claim 3
Dependent Claim
156 words
A magnetic bubble domain system having localized areas of spatial stability adapted to provide a unidirectional preferred movement for bubble domains comprising a substrate, a thin film of mangetic bubble domain magnetic on said substrate, a first portion of said film having a first thickness, said first portion having a truncated shape including a narrow end and a wide end, said first portion being surrounded by a first region of said film having a thickness less than said first portion, and a plurality of portions of said film having a second thickness, said plurality of portions each having a truncated shape including a narrow end and a wide end, said plurality of portions being surrounded each by a region of said film having a thickness less than said plurality of portions, said plurality of portions being in spaced linear relation with said first portion wherein said narrow ends are uniformly and symmetrically spaced from each other.
Claim 4
Dependent Claim
156 words
A magnetic bubble domain system having localized areas of spatial stability adapted to provide a unidirectional preferred movement for bubble domains comprising a substrate, a thin film of mangetic bubble domain magnetic on said substrate, a first portion of said film having a first thickness, said first portion having a truncated shape including a narrow end and a wide end, said first portion being surrounded by a first region of said film having a thickness less than said first portion, and a plurality of portions of said film having a second thickness, said plurality of portions each having a truncated shape including a narrow end and a wide end, said plurality of portions being surrounded each by a region of said film having a thickness less than said plurality of portions, said plurality of portions being in spaced linear relation with said first portion wherein said narrow ends are uniformly and symmetrically spaced from each other.
References Cited (Backward Citations)
US3540019A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1976-02-20 | 1976-08-21 | 1977-02-20 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-02-20 | 1980-08-21 | 1981-02-20 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-02-20 | 1984-08-21 | 1985-02-20 | $7700.00 | Window Closed / Lapsed |