US3699552A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Magnetic bubble device and method of manufacture
Assignee: AT&T Inc
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Filing: 1970-12-30
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Granted: 1972-10-17
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Expires: 1990-12-30
Abstract
Abstract For a magnetic bubble device, circuitry and support structure is disclosed which employs a glaze layer. The glaze isolates two layers of control conductors from each other, supports a magnetic bubble crystal, houses a Hall-effect device and is transparent to allow transmission of polarized light for bubble observation and detection purposes.
Inventors
- 👤 Raymond P De Fabritis
- 👤 Gerald Burt Fefferman
- 👤 Bruce David Gesner
- 👤 Raymond John Radner
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 01:02
CPC Classifications
H; H01; H01F; H01F10/00; H01F10/06; G; G11; G11C; G11C19/00; G11C19/02; G11C19/08; G11C19/0866
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
183 words
A magnetic bubble device comprising: a sheet medium consisting of a crystal having magnetic uniaxial anisotropy and capable of exhibiting magnetic domains; electrical circuit means for manipulating said domains in said sheet, comprising: an electrically inert glass substrate; bottom conductive paths formed in a first multilayered metal film adhered to one surface of said substrate; said first metal film being formed by thermal decomposition of a resinate mixture applied to said substrate and consisting of a gold resinate with traces of bismuth, lead, silicon, and boron resinates; a glaze layer formed atop said bottom conductor paths formed by application of a glass paste atop said substrate and the formed bottom conductors, said paste comprising a major fraction of lead oxide, with minor fractions of silicon dioxide, boron trioxide and cadmium oxide, and top conductive paths formed in a second multilayered metal film adhered to said glaze layer and to said substrate; said top and bottom paths being vertically isolated from each other by said glaze layer; said sheet medium being mounted with one face entirely in close proximity to said top conductive paths.
Claim 2
Dependent Claim
183 words
A magnetic bubble device comprising: a sheet medium consisting of a crystal having magnetic uniaxial anisotropy and capable of exhibiting magnetic domains; electrical circuit means for manipulating said domains in said sheet, comprising: an electrically inert glass substrate; bottom conductive paths formed in a first multilayered metal film adhered to one surface of said substrate; said first metal film being formed by thermal decomposition of a resinate mixture applied to said substrate and consisting of a gold resinate with traces of bismuth, lead, silicon, and boron resinates; a glaze layer formed atop said bottom conductor paths formed by application of a glass paste atop said substrate and the formed bottom conductors, said paste comprising a major fraction of lead oxide, with minor fractions of silicon dioxide, boron trioxide and cadmium oxide, and top conductive paths formed in a second multilayered metal film adhered to said glaze layer and to said substrate; said top and bottom paths being vertically isolated from each other by said glaze layer; said sheet medium being mounted with one face entirely in close proximity to said top conductive paths.
Claim 3
Dependent Claim
63 words
A device pursuant to claim 1, wherein said bottom conductive path includes an elongated loop having legs 1.5 mils wide, separated by from 0.3 mil to 3 mils; and wherein said top conductive path comprises a second elongated loop of like dimensions crossing over said first loop at substantially right angles thereto at a point adjacent to the ends of both said loops.
Claim 4
Dependent Claim
78 words
A device pursuant to claim 2, further comprising gently tapered exterior edges on said glaze layer, the latter further comprising a rectangular cavity with steeply tapered interior edges; and wherein said top conductive paths comprise four lands each having a pad area adjacent to one of the edges of said cavity; and a Hall-effect device with four leads disposed at right angles to each other supported in said cavity by bonding of said leads to respective said pads.
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) | 1975-10-17 | 1976-04-17 | 1976-10-17 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-10-17 | 1980-04-17 | 1980-10-17 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-10-17 | 1984-04-17 | 1984-10-17 | $7700.00 | Window Closed / Lapsed |