Patent US2500070A successfully refreshed from Google Patents.
US3985281A
Expired / Lapsed
US
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Method of producing an electrical conductor
Assignee: Siemens AG
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Filing: 1972-06-09
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Granted: 1976-10-12
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Expires: 1992-06-09
Abstract
Abstract A method of producing a conductor for a superconducting cable or the like is disclosed. The conductor is made up of at least niobium and copper of which the copper is an electrically normal-conducting metal. The method includes heating a niobium carrier to a temperature between 150° and 800°C in a vacuum having a residual gas pressure of at most 10 - 4 Torr, and evaporating copper unto the niobium carrier to form a tightly adhering copper layer thereon. If required, the conductor can be produced to include other electrically normal-conducting metals.
Inventors
- 👤 Heinrich Diepers
- 👤 Hans Pfister
- 👤 Karl-Heinz Jablonski
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 10:02
CPC Classifications
C; C23; C23C; C23C14/00; C23C14/06; C23C14/14; C23C14/16; H; H10; H10N; H10N60/00; H10N60/01; H10N60/0156; Y; Y10; Y10S; Y10S505/00; Y10S505/825; Y10S505/917; Y10S505/927; Y10T; Y10T29/00; Y10T29/49; Y10T29/49002; Y10T29/49014
Claims Analysis
Total Claims: 13
Claim 1
Independent Claim
81 words
Method of producing a conductor for a superconducting cable or the like, the conductor being made up of at least niobium and copper, the method comprising heating a niobium carrier to a temperature between 150° and 800°C in a vacuum having a residual gas pressure of at most 10 - 4 Torr and then letting the carrier cool down, evaporating copper onto the cooled down niobium carrier, and heating the copper-coated niobium carrier to form a tightly adhering copper layer thereon.
Claim 2
Dependent Claim
81 words
Method of producing a conductor for a superconducting cable or the like, the conductor being made up of at least niobium and copper, the method comprising heating a niobium carrier to a temperature between 150° and 800°C in a vacuum having a residual gas pressure of at most 10 - 4 Torr and then letting the carrier cool down, evaporating copper onto the cooled down niobium carrier, and heating the copper-coated niobium carrier to form a tightly adhering copper layer thereon.
Claim 3
Dependent Claim
44 words
The method of claim 1 wherein the niobium carrier is heated in the first heating step until the surface thereof is clean, and wherein the copper-coated niobium carrier is heated until a diffusion bond is formed between the niobium carrier and the copper layer.
Claim 4
Dependent Claim
33 words
The method of claim 1 wherein the niobium carrier is a thin foil, and wherein the copper layer evaporated onto the thin foil carrier has a thickness of approximately 1 to 5 μm.
Claim 5
Dependent Claim
25 words
The method of claim 1 wherein the niobium carrier is tubular, and wherein the copper is evaporated onto the outer side of the tubular carrier.
Claim 6
Dependent Claim
25 words
The method of claim 1 wherein the niobium carrier is band-shaped, and wherein the copper is evaporated onto only one side of the band-shaped carrier.
Claim 7
Dependent Claim
18 words
The method of claim 1 wherein the niobium carrier is heated to a temperature between 200° and 600°C.
Claim 8
Dependent Claim
109 words
Method of producing a conductor for a superconducting cable or the like, the conductor being made up of at least niobium and electrically normal-conducting copper, the method comprising heating a band-shaped niobium carrier to a temperature between 150° and 800° C in a vacuum having a residual gas pressure of at most 10 - 4 Torr, evaporating copper unto only one side of the niobium carrier to form a tightly adhering copper layer thereon, and joining at least one copper-coated, band-shaped niobium carrier to a tube also made of an electrically normal-conducting metal, the carriers being joined to the tube at the side of the carriers coated with copper.
Claim 9
Dependent Claim
109 words
Method of producing a conductor for a superconducting cable or the like, the conductor being made up of at least niobium and electrically normal-conducting copper, the method comprising heating a band-shaped niobium carrier to a temperature between 150° and 800° C in a vacuum having a residual gas pressure of at most 10 - 4 Torr, evaporating copper unto only one side of the niobium carrier to form a tightly adhering copper layer thereon, and joining at least one copper-coated, band-shaped niobium carrier to a tube also made of an electrically normal-conducting metal, the carriers being joined to the tube at the side of the carriers coated with copper.
Claim 10
Dependent Claim
27 words
The method of claim 7 wherein the niobium carrier is soldered to the tube so as to join the copper-coated side of the carrier to the tube.
Claim 11
Dependent Claim
102 words
Method of producing a conductor for a superconducting cable or the like, the conductor having respective portions of niobium and copper as well as an additional portion, the copper being an electrically normal-conducting metal and the additional portion also consisting of electrically normal-conducting metal, the method comprising heating a niobium carrier to a temperature between 150° and 800°C in a vacuum having a residual gas pressure of at most 10 - 4 Torr, evaporating copper unto the niobium carrier to form a tightly adhering copper layer thereon, and joining the copper-coated niobium carrier to an electrically normal-conducting metal constituting the additional portion.
Claim 12
Dependent Claim
102 words
Method of producing a conductor for a superconducting cable or the like, the conductor having respective portions of niobium and copper as well as an additional portion, the copper being an electrically normal-conducting metal and the additional portion also consisting of electrically normal-conducting metal, the method comprising heating a niobium carrier to a temperature between 150° and 800°C in a vacuum having a residual gas pressure of at most 10 - 4 Torr, evaporating copper unto the niobium carrier to form a tightly adhering copper layer thereon, and joining the copper-coated niobium carrier to an electrically normal-conducting metal constituting the additional portion.
Claim 13
Dependent Claim
25 words
The method of claim 9 wherein the copper layer portion of the niobium carrier is alloyed to the electrically normal-conducting metal of the additional portion.
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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) | 1979-10-12 | 1980-04-12 | 1980-10-12 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1983-10-12 | 1984-04-12 | 1984-10-12 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1987-10-12 | 1988-04-12 | 1988-10-12 | $7700.00 | Window Closed / Lapsed |