Patent US4421946A successfully refreshed from Google Patents.
US4421946A
Expired / Lapsed
US
⏱️ 0.0 years remaining
High current capacity superconductor
Assignee: Furukawa Electric Co Ltd
•
Filing: 1980-05-16
•
Granted: 1983-12-20
•
Expires: 2000-05-16
Abstract
Abstract The present invention relates to a high current capacity superconductor having a high current density and high stability suitable as a superconductive coil for a large superconductive magnet. In a composite superconductor (1) having superconductive wires (2) and an electrically and thermally highly conductive stable metal (4) electrically coupled in the longitudinal direction, a high current capacity composite superconductor characterized by having an inorganic compound film (5) on the surface of the stabilizing metal (4).
Inventors
- 👤 Yoshio Furuto
- 👤 Shinichiro Meguro
- 👤 Takuya Suzuki
- 👤 Ikuo Ito
- 👤 Toshinari Ando
- 👤 Masataka Nishi
- 👤 Susumu Shimamoto
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 19:47
CPC Classifications
H; H01; H01B; H01B12/00; H01B12/02; H01B12/10; H01B12/16; H01F; H01F6/00; H01F6/06; H01F27/00; H01F27/28; H01F27/2804; H01F27/2819; Y; Y02; Y02E; Y02E40/00; Y02E40/60; Y10; Y10S; Y10S505/00; Y10S505/825; Y10S505/884; Y10S505/887; Y10T; Y10T29/00; Y10T29/49; Y10T29/49002; Y10T29/49014
Claims Analysis
Total Claims: 14
Claim 1
Independent Claim
56 words
In a composite superconductor having superconductive wires and electrically and thermally high conductive stabilizing metal electrically coupled in the longitudinal direction of the superconductive wires, a high current capacity superconductor to be used in direct contact with a liquid coolant wherein the improvement comprises an inorganic compound film formed on the surface of the stabilizing metal.
Claim 2
Dependent Claim
56 words
In a composite superconductor having superconductive wires and electrically and thermally high conductive stabilizing metal electrically coupled in the longitudinal direction of the superconductive wires, a high current capacity superconductor to be used in direct contact with a liquid coolant wherein the improvement comprises an inorganic compound film formed on the surface of the stabilizing metal.
Claim 3
Dependent Claim
35 words
In the high current capacity composite superconductor according to claim 1, the further improvement wherein the surface of the inorganic compound film is covered with an electrically insulating spacer so as to be partially exposed.
Claim 4
Dependent Claim
31 words
In the high current capacity composite superconductor according to claim 1 or 2, the further improvement wherein said stabilizing metal has a number of concaves and convexes on the surface thereof.
Claim 5
Dependent Claim
32 words
In the high current capacity composite superconductor according to claim 3, the further improvement wherein the concaves and convexes are parallel grooves or ribs extending in the longitudinal direction of the superconductor.
Claim 6
Dependent Claim
33 words
In the high current capacity composite superconductor according to claims 1 and 2, the further improvement wherein the stabilizing metal is copper and the inorganic compound film is a film of copper oxide.
Claim 7
Dependent Claim
103 words
In a composite high current capacity superconductpr at least a portion of which is in direct contact with a liquid coolant, the superconductor having a plurality of superconductive wires and electrically and thermally high conductive stabilizing metal electrically coupled in the longitudinal direction of the superconductive wires, at least a portion of said stabilizing metal being in direct contact with said cooling liquid, the improvement wherein an inorganic compound film is formed on at least the surface portions of said stabilizing metal and in direct contact with said liquid coolant to promote the cooling accompanied by a phase change of said liquid coolant.
Claim 8
Dependent Claim
103 words
In a composite high current capacity superconductpr at least a portion of which is in direct contact with a liquid coolant, the superconductor having a plurality of superconductive wires and electrically and thermally high conductive stabilizing metal electrically coupled in the longitudinal direction of the superconductive wires, at least a portion of said stabilizing metal being in direct contact with said cooling liquid, the improvement wherein an inorganic compound film is formed on at least the surface portions of said stabilizing metal and in direct contact with said liquid coolant to promote the cooling accompanied by a phase change of said liquid coolant.
Claim 9
Dependent Claim
35 words
In the high current capacity composite supeconductor according to claim 6, the further improvement wherein the surface of the inorganic compound film is covered with an electrically insulating spacer so as to be partially exposed.
Claim 10
Dependent Claim
31 words
In the high current capacity composite superconductor according to claim 6 or 7, the further improvement wherein said stabilizing metal has a number of concaves and convexes on the surface thereof.
Claim 11
Dependent Claim
31 words
In the high current capacity composite superconductor according to claim 8, the further improvement wherin concaves and convexes are parallel grooves or ribs extending in the longitudinal direction of the superconductor.
Claim 12
Dependent Claim
33 words
In the high current capcity composite superconductor according to claim 6 or 7, the further improvement wherein the stabilizing metal is copper and the inorganic compound film is a film of copper oxide.
Claim 13
Dependent Claim
36 words
In the composite superconductor according to claim 1 or 6, the further improvement wherein said liquid coolant comprises liquid helium which is subjected to nuclear boiling during heat transfer from said superconductor to said liquid coolant.
Claim 14
Dependent Claim
28 words
In the composite superconductor according to claim 6, the further improvement wherein said superconductor having said plurality of superconductive wires comprises a coil conductor of a superconductive magnet.
References Cited (Backward Citations)
US3428925A
Cited
US3527873A
Cited
US3764725A
Cited
US3731374A
Cited
US3743986A
Cited
US3767842A
Cited
US4094060A
Cited
US3954572A
Cited
US4329539A
Cited
US4079187A
Cited
US4148129A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1986-12-19 | 1987-06-20 | 1987-12-20 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1990-12-19 | 1991-06-20 | 1991-12-20 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1994-12-19 | 1995-06-20 | 1995-12-20 | $7700.00 | Window Closed / Lapsed |