Patent US3661639A successfully refreshed from Google Patents.
US3661639A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Superconducting electrical conductors
Assignee: Plessey Overseas Ltd
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Filing: 1969-02-20
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Granted: 1972-05-09
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Expires: 1989-02-20
Abstract
Abstract In preparation of superconducting electrical conductors specifically niobium tin alloy, the reaction between niobium and tin is considerably accelerated if the niobium contains about 2,500 parts per million of oxygen before it is coated with tin. This concentration of oxygen does not have a harmful effect on the tape or its critical current density and the time for processing the tape may thus be considerably reduced.
Inventors
- 👤 James S Caslaw
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 17:08
CPC Classifications
H; H10; H10N; H10N60/00; H10N60/01; H10N60/0184; Y; Y10; Y10S; Y10S505/00; Y10S505/80; Y10S505/815; Y10S505/818; Y10S505/821; Y10T; Y10T29/00; Y10T29/49; Y10T29/49002; Y10T29/49014
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
20 words
A process as claimed in claim 1, in which the oxygen content is from 2,000 to 3,000 parts per million.
Claim 2
Dependent Claim
26 words
A process as claimed in claim 1, in which the oxygen content is provided by heating the wire or tape in a gaseous atmosphere containing oxygen.
Claim 3
Dependent Claim
22 words
A process as claimed in claim 1, in which the oxygen content is provided by surface oxidation of the wire or tape.
Claim 4
Dependent Claim
17 words
A process as claimed in claim 4, in which surface oxidation is effected by an electrolytic process.
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) | 1975-05-09 | 1975-11-08 | 1976-05-09 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-05-09 | 1979-11-08 | 1980-05-09 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-05-09 | 1983-11-08 | 1984-05-09 | $7700.00 | Window Closed / Lapsed |