US3777368A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method of producing a composite tubular superconductor
Assignee: Siemens AG
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Filing: 1972-08-10
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Granted: 1973-12-11
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Expires: 1992-08-10
Abstract
Abstract A method of producing tubular conductors includes bending a conductor band to abut the longitudinal edges thereof to form a tube. The conductor band includes a layer of niobium adjacent a layer of an electrically normal conducting metal and ribbon-like niobium chords that define the respective longitudinal edges of the band. After the tube is formed, the niobium chords are joined to each other. The method is especially suited for producing tubular conductors for superconducting cables and the like such as superconducting alternating-current cables.
Inventors
- 👤 H Pfister
- 👤 H Diepers
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 20:02
CPC Classifications
B; B21; B21C; B21C37/00; B21C37/06; B21C37/08; B21C37/09; H; H10; H10N; H10N60/00; H10N60/01; H10N60/0128; Y; Y10; Y10S; Y10S505/00; Y10S505/825; Y10S505/917; Y10S505/925; Y10S505/927; Y10T; Y10T29/00; Y10T29/49; Y10T29/49002; Y10T29/49014
Claims Analysis
Total Claims: 19
Claim 1
Independent Claim
64 words
Method of producing tubular conductors for superconducting cables and the like comprising bending a conductor band to abut the longitudinal edges thereof to form a tube, the conductor band including a layer of niobium adjacent a layer of an electrically normal conducting metal, and respective ribbon-like niobium chords defining the longitudinal edges of the band; and metallurgically bonding the niobium chords to each other.
Claim 2
Dependent Claim
64 words
Method of producing tubular conductors for superconducting cables and the like comprising bending a conductor band to abut the longitudinal edges thereof to form a tube, the conductor band including a layer of niobium adjacent a layer of an electrically normal conducting metal, and respective ribbon-like niobium chords defining the longitudinal edges of the band; and metallurgically bonding the niobium chords to each other.
Claim 3
Dependent Claim
17 words
The method of claim 1 wherein the niobium chords are bonded to each other by electron-beam welding.
Claim 4
Dependent Claim
90 words
The method of claim 1 comprising the steps of producing the conducting band by electron-beam welding ribbon-like niobium chords to the respective longitudinal edges of a niobium foil strip so as to form a niobium band having a U-shaped cross section, At least partially filling the space bounded by the inside surface of the U-shaped niobium band with an electrically normal conducting metal, and then applying heat to the normal conducting metal and the U-shaped niobium band to metallurgically bond the normal conducting metal to the foil and the chords.
Claim 5
Dependent Claim
13 words
The method of claim 3 wherein the electrically normal conducting metal is copper.
Claim 6
Dependent Claim
83 words
The method of claim 4 comprising laying a copper strip into the space bounded by the inside surface of the U-shaped niobium band, the copper strip thereby having respective contacting surfaces contacting the niobium foil and niobium chords, and passing the composite band consisting of the copper strip and U-shaped niobium band through a heated zone where the heat is sufficient to cause the copper strip to become metallurgically bonded to the niobium foil and niobium chords at least at said contacting surfaces.
Claim 7
Dependent Claim
16 words
The method of claim 5 wherein the heat in the heated zone is generated by induction.
Claim 8
Dependent Claim
16 words
The method of claim 5 wherein the heat in the heated zone is generated by radiation.
Claim 9
Dependent Claim
18 words
The method of claim 5 wherein the heat in the heated zone is generated by an electron beam.
Claim 10
Dependent Claim
18 words
The method of claim 8 comprising directing the electron beam onto the niobium side of the composite band.
Claim 11
Dependent Claim
18 words
The method of claim 8 comprising directing the electron beam onto the copper side of the composite band.
Claim 12
Dependent Claim
20 words
The method of claim 8 comprising deflecting the electron beam as a spot across the width of the composite band.
Claim 13
Dependent Claim
19 words
The method of claim 8 comprising linearly directing the electron beam transversely to the width of the composite band.
Claim 14
Dependent Claim
71 words
The method of claim 1 wherein the normal conducting layer is a copper strip, the method comprising the steps of producing the conductor band by first diffusion bonding ribbon-like niobium chords to the side edges of the copper strip respectively to form respective diffusion bonds, and applying a niobium layer to at least one side of the band consisting of the niobium chords and copper strip to form a composite band.
Claim 15
Dependent Claim
42 words
The method of claim 13 wherein the diffusion bonds between the niobium chords and the copper strips are formed by heating respective edge zones of the copper strips adjoining the chords with an electron beam above the melting point of the copper.
Claim 16
Dependent Claim
30 words
The method of claim 13 comprising the step of applying the niobium layer by fusion electrolytically depositing the niobium onto the band consisting of the niobium chords and copper strip.
Claim 17
Dependent Claim
36 words
Method of claim 13 wherein the niobium layer is a niobium foil, the method comprising welding the niobium foil onto the niobium chords, and applying heat to diffusion bond the niobium foil to the copper strip.
Claim 18
Dependent Claim
51 words
The method of claim 16, wherein after welding the niobium foil onto the niobium chords, the method comprises bending the composite band to abut the chords to form a member of tubular cross-section, welding the abutting chords to each other, and then diffusion bonding the niobium foil to the copper strip.
Claim 19
Dependent Claim
54 words
The method of claim 16 wherein after welding the niobium foil onto the niobium chords, the method comprises bending the composite band to abut the chords to form a member of tubular cross-section, diffusion bonding the niobium foil to the copper strip, and then welding the abutting surfaces of the chords to each other.
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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) | 1976-12-10 | 1977-06-11 | 1977-12-11 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-12-10 | 1981-06-11 | 1981-12-11 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-12-10 | 1985-06-11 | 1985-12-11 | $7700.00 | Window Closed / Lapsed |