US3737824A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Twisted multifilament superconductor
Assignee: National Aeronautics and Space Administration
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Filing: 1972-08-11
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Granted: 1973-06-05
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Expires: 1992-08-11
Abstract
Abstract Masking selected portions of a ribbon and forming an intermetallic compounds on the unmasked portions by a controlled diffusion reaction produces a twisted filamentary structure. The masking material prohibits the formation of superconductive material on predetermined areas of the substrate.
Inventors
- 👤 W Coles
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 10:09
CPC Classifications
H; H10; H10N; H10N60/00; H10N60/01; H10N60/0184; Y; Y10; Y10S; Y10S336/00; Y10S336/01; Y10S424/00; Y10S424/08; Y10S505/00; Y10S505/825; Y10S505/884; Y10S505/887; Y10S505/917; Y10S505/918; Y10S505/919; Y10S505/92; Y10T; Y10T29/00; Y10T29/49; Y10T29/49002; Y10T29/49014
Claims Analysis
Total Claims: 9
Claim 1
Independent Claim
23 words
A method of making a twisted multifilament superconductor as claimed in claim 1 wherein the superconductive compound filament is formed by diffusion reaction.
Claim 2
Dependent Claim
59 words
A method of making a twisted multifilament superconductor as claimed in claim 1 wherein the substrate is masked by coating the substrate with an intermediate masking material, removing said intermediate masking material in predetermined regions to expose the portions of the substrate to be masked, and forming a mask in said regions by oxidizing the exposed substrate material therein.
Claim 3
Dependent Claim
38 words
A method of making a twisted multifilament superconductor as claimed in claim 3 wherein the mask is formed in the predetermined regions by heating the substrate after the intermediate masking material has been removed in the predetermined regions.
Claim 4
Dependent Claim
29 words
A method of making a twisted multifilament superconductor as claimed in claim 3 wherein the predetermined portions of the intermediate masking material are removed by a photo resist process.
Claim 5
Dependent Claim
118 words
A method of making a twisted multifilament superconductor as claimed in claim 5 wherein the predetermined portions of the intermediate masking material are removed by covering the intermediate masking material with a photo resist material, selectively exposing the photo resist material to light through masks that form continuous paths across the faces of the substrate and around the edges thereof, developing the photo resist material to remove the same in said predetermined regions and provide a protective coating over said intermediate masking material in regions where the filament is to be formed, and applying an etchant to the covered substrate to remove the intermediate masking material in said predetermined regions where said photo resist material has been removed.
Claim 6
Dependent Claim
34 words
A superconductive ribbon comprising a flexible substrate, a superconductive compound in the form of filaments twisted about said substrate to form filamentary current paths, and a mask between said filaments to support the same.
Claim 7
Dependent Claim
24 words
A superconductive ribbon as claimed in claim 7 wherein each twisted multifilament is an intermetallic compound of the substrate material formed by diffusion reaction.
Claim 8
Dependent Claim
13 words
A superconductive ribbon as claimed in claim 8 wherein the substrate is niobium.
Claim 9
Dependent Claim
14 words
A superconductive ribbon as claimed in claim 9 wherein the superconductive compound is Nb3Sn.
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) | 1976-06-04 | 1976-12-04 | 1977-06-05 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-06-04 | 1980-12-04 | 1981-06-05 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-06-04 | 1984-12-04 | 1985-06-05 | $7700.00 | Window Closed / Lapsed |