Patent US4647888A successfully refreshed from Google Patents.
US4647888A
Expired / Lapsed
US
⏱️ 0.0 years remaining
High heat capacity composites for a superconductor
Assignee: General Atomics Corp
•
Filing: 1985-05-09
•
Granted: 1987-03-03
•
Expires: 2005-05-09
Abstract
Abstract To thermally stabilize superconductors that are potted in a polymeric material, such as is common in superconducting coils, materials having extremely high heat capacities at the superconducting temperatures are incorporated into the potting material. The heat-absorbing material may have an extremely high heat capacity at superconducting temperatures due to magnetic orderings it undergoes at superconducting temperatures or may be a heavy fermion material having electrons with effective masses greatly exceeding the bare electron mass.
Inventors
- 👤 Lawrence D. Woolf
- 👤 John R. Purcell
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 04:40
CPC Classifications
H; H01; H01F; H01F6/00; H01F6/06; H01F27/00; H01F27/28; H01F27/2804; H01F27/2819; H10; H10N; H10N60/00; H10N60/20; Y; Y10; Y10S; Y10S505/00; Y10S505/825; Y10S505/88; Y10S505/884; Y10S505/887
Claims Analysis
Total Claims: 18
Claim 1
Independent Claim
62 words
Composite potting material for a superconductor comprising a polymeric dielectric material stable at temperatures below about 25° K. and heat-absorbing material, selected from the group consisting of heavy fermion materials, magnetic ordering transition materials and mixtures thereof, contained within said polymeric material having a heat capacity at temperatures below about 25° K. at least about two orders of magnitude greater than copper.
Claim 2
Dependent Claim
62 words
Composite potting material for a superconductor comprising a polymeric dielectric material stable at temperatures below about 25° K. and heat-absorbing material, selected from the group consisting of heavy fermion materials, magnetic ordering transition materials and mixtures thereof, contained within said polymeric material having a heat capacity at temperatures below about 25° K. at least about two orders of magnitude greater than copper.
Claim 3
Dependent Claim
24 words
Composite potting material according to claim 1 wherein said heat-absorbing material is selected from the group consisting of gadolinium oxide and gadolinium aluminum oxides.
Claim 4
Dependent Claim
20 words
Composite material according to claim 1 wherein said heat-absorbing material is in particulate form and dispersed within said polymeric material.
Claim 5
Dependent Claim
17 words
Composite material according to claim 1 wherein said heat-absorbing material is fibers encased within said polymeric material.
Claim 6
Dependent Claim
23 words
Composite material according to claim 1 wherein said heat-absorbing material comprises between about 5 and about 70 volume percent of said composite material.
Claim 7
Dependent Claim
40 words
Composite material according to claim 1 wherein said heat absorbing material is selected from the group consisting of CeAl 3 , CeCu 2 Si 2 , UBe 13 , U 6 Fe, CeCu 6 and U 2 Zn 17 .
Claim 8
Dependent Claim
34 words
Composite material according to claim 1 wherein said dielectric polymeric material has a flexural modulus of at least about 10 6 psi in the superconducting temperature range to which it is to be subjected.
Claim 9
Dependent Claim
33 words
Composite material according to claim 1 wherein said dielectric polymeric material has a tensile strength of at least about 5,000 psi in the superconducting temperature range to which it is to be subjected.
Claim 10
Dependent Claim
97 words
A superconducting coil comprising a superconductor wound in a spiral configuration, said superconductor having one or more superconducting filaments and a stabilizer metal cladding said superconducting filament, said wound superconductor being potted in a composite matrix comprising a polymeric dielectric material stable at temperatures below about 25° K. and heat-absorbing material, selected from the group consisting of heavy fermion superconducting materials, magnetic ordering transition materials and mixtures thereof, contained within said polymeric dielectric material, said heat-absorbing material having a heat capacity at temperatures below about 25° K. at least about two orders of magnitude greater than copper.
Claim 11
Dependent Claim
97 words
A superconducting coil comprising a superconductor wound in a spiral configuration, said superconductor having one or more superconducting filaments and a stabilizer metal cladding said superconducting filament, said wound superconductor being potted in a composite matrix comprising a polymeric dielectric material stable at temperatures below about 25° K. and heat-absorbing material, selected from the group consisting of heavy fermion superconducting materials, magnetic ordering transition materials and mixtures thereof, contained within said polymeric dielectric material, said heat-absorbing material having a heat capacity at temperatures below about 25° K. at least about two orders of magnitude greater than copper.
Claim 12
Dependent Claim
24 words
A superconducting coil according to claim 9 wherein said heat-absorbing material is selected from the group consisting of gadolinium oxide and gadolinium aluminum oxides.
Claim 13
Dependent Claim
39 words
A superconducting coil according to claim 9 wherein said heat-absorbing material is selected from the group consisting of CeAl 3 , CeCu 2 Si 2 , UBe 13 , U 6 CeCu 6 and U 2 Zn 17 .
Claim 14
Dependent Claim
24 words
A superconducting coil according to claim 9 wherein said heat-absorbing material comprises between about 5 and about 70 volume percent of said composite material.
Claim 15
Dependent Claim
21 words
A superconducting coil according to claim 9 wherein said heat-absorbing material is in particulate form and dispersed within said polymeric material.
Claim 16
Dependent Claim
18 words
A superconducting coil according to claim 9 wherein said heat-absorbing material is fibers encased within said polymeric material.
Claim 17
Dependent Claim
35 words
A superconducting coil according to claim 9 wherein said polymeric dielectric material has a flexural modulus of at least about 10 6 psi in the superconducting temperature range to which it is to be subjected.
Claim 18
Dependent Claim
33 words
A superconducting coil according to claim 9 wherein said polymeric material has a tensile strength of at least about 5,000 psi in the superconducting temperature range to which it is to be subjected.
References Cited (Backward Citations)
US3109745A
Cited
US3766502A
Cited
US3983521A
Cited
US4190817A
Cited
US4171464A
Cited
US4195199A
Cited
JPS5562708A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1990-03-02 | 1990-09-01 | 1991-03-03 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1994-03-02 | 1994-09-01 | 1995-03-03 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1998-03-02 | 1998-09-01 | 1999-03-03 | $7700.00 | Window Closed / Lapsed |