US4263603A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Subminiature bore and conductor formation
Assignee: Unisys Corp
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Filing: 1979-06-06
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Granted: 1981-04-21
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Expires: 1999-06-06
Abstract
Abstract A process for forming subminiature bores through very thin layers of insulative material disposed between spaced electrical conductors permits the lining of the conductors by a further conductor of microscopic cross section whose dimensions are readily controlled. The method provides reliable reproduction of weak link conductors for employment in applications such as Josephson superconductive devices.
Inventors
- 👤 Don W. Jillie, Jr.
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 00:48
CPC Classifications
H; H10; H10D; H10D1/00; H10D1/60; H10D1/68; H10N; H10N60/00; H10N60/01; H10N60/0912; H10W; H10W20/00; H10W20/01; H10W20/031; H10W20/056; Y; Y10; Y10S; Y10S505/00; Y10S505/825; Y10S505/873; Y10S505/874
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
154 words
A current controlling device comprising: first and second electrically super-conductive layers, one superposed with respect to the other, and first and second electrically insulative permanent layers interposed between said first and second electrically super-conductive layers, said electrically insulative permanent layers having at least one hole therethrough with a first electrical linking super-conductor disposed in current carrying relation between said first and second electrically super-conductive layers, said first electrically insulative permanent layer being composed of a material resistant to etching by a first etching process but susceptible of etching by a second etching process to form a first portion of said hole, said second electrically insulative permanent layer being composed of a material susceptible of etching by said first etching process to form a second portion of said hole but resistant to said second etching process, and said first electrically super-conducting layer and said first electrical linking super-conductor being formed integrally of the same material.
Claim 2
Dependent Claim
154 words
A current controlling device comprising: first and second electrically super-conductive layers, one superposed with respect to the other, and first and second electrically insulative permanent layers interposed between said first and second electrically super-conductive layers, said electrically insulative permanent layers having at least one hole therethrough with a first electrical linking super-conductor disposed in current carrying relation between said first and second electrically super-conductive layers, said first electrically insulative permanent layer being composed of a material resistant to etching by a first etching process but susceptible of etching by a second etching process to form a first portion of said hole, said second electrically insulative permanent layer being composed of a material susceptible of etching by said first etching process to form a second portion of said hole but resistant to said second etching process, and said first electrically super-conducting layer and said first electrical linking super-conductor being formed integrally of the same material.
Claim 3
Dependent Claim
34 words
A current controlling device as described in claim 1 wherein: said second etching process is a wet acid etching process, and said first etching process is a reactive electrically energized gaseous ion etching process.
Claim 4
Dependent Claim
19 words
A current controlling device as described in claim 2 wherein said first electrically insulative permanent layer is silicon dioxide.
Claim 5
Dependent Claim
18 words
A current controlling device as described in claim 3 wherein said second electrically insulative permanent layer is silicon.
Claim 6
Dependent Claim
29 words
A current controlling device as described in claim 4 wherein said first and second electrically super conductive layers and said electrical linking super conductor consist of a superconductive niobium.
Claim 7
Dependent Claim
50 words
A current controlling device as described in claim 5 wherein said electrically insulative permanent layers have at least a second hole therethrough spaced apart from said first hole with a second electrical linking superconductor composed of niobium and disposed in current carrying relation between said first and second conducting layers.
Claim 8
Dependent Claim
51 words
A superconductive control device incorporating the current controlling device of claim 6 and further including control line means proximate said first and second electrically conductive layers and electrically insulated therefrom for providing a control magnetic field at the region of said first and second linking superconductors for controlling current flow therethrough.
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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) | 1984-04-20 | 1984-10-20 | 1985-04-21 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1988-04-20 | 1988-10-20 | 1989-04-21 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1992-04-20 | 1992-10-20 | 1993-04-21 | $7700.00 | Window Closed / Lapsed |