US4954481A
Expired / Lapsed
US
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Superconductor-polymer composites
Assignee: United States Department of Commerce
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Filing: 1988-12-29
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Granted: 1990-09-04
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Expires: 2008-12-29
Abstract
Abstract Superconductor-polymer composite materials comprise a matrix formed of a rmoplastic polymer and a superconductor powder dispersed in the matrix. The superconductor powder preferably has a composition RBa 2 Cu 3 O 7-x wherein R is a rare earth metal and x is less than or equal to 1. The thermoplastic polymer matrix comprises a vinylidene fluoride homopolymer or copolymer. The composite materials may be formed as shaped products, sheets or films.
Inventors
- 👤 Aime S. DeReggi
- 👤 Chwan-Kang Chiang
- 👤 George T. Davis
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-07 10:01
CPC Classifications
H; H10; H10N; H10N60/00; H10N60/80; H10N60/85; H10N60/855; H10N60/857; Y; Y10; Y10S; Y10S428/00; Y10S428/901; Y10S428/922; Y10S428/9265; Y10S428/93; Y10S505/00; Y10S505/70; Y10S505/701; Y10S505/702; Y10S505/703; Y10S505/704; Y10T; Y10T428/00; Y10T428/25; Y10T428/254; Y10T428/256; Y10T428/257; Y10T428/259; Y10T428/31504; Y10T428/31678
Claims Analysis
Total Claims: 11
Claim 1
Independent Claim
56 words
Composite material, comprising a matrix formed of a thermoplastic polymer and a superconductor powder dispersed in the matrix, the superconductor powder having a composition RBa 2 Cu 3 O 7-x wherein R is a rare earth metal and x is less than or equal to 1, said thermoplastic polymer comprising a vinylidene fluoride homopolymer or copolymer.
Claim 2
Dependent Claim
56 words
Composite material, comprising a matrix formed of a thermoplastic polymer and a superconductor powder dispersed in the matrix, the superconductor powder having a composition RBa 2 Cu 3 O 7-x wherein R is a rare earth metal and x is less than or equal to 1, said thermoplastic polymer comprising a vinylidene fluoride homopolymer or copolymer.
Claim 3
Dependent Claim
21 words
Composite material as defined by claim 1, wherein the thermoplastic polymer exhibits a glass transition temperature less than about 25° C.
Claim 4
Dependent Claim
25 words
Composite material as defined by claim 1, wherein the thermoplastic polymer comprises a copolymer of vinylidene fluoride and a monomer selected from tetrafluoroethylene and trifluoroethylene.
Claim 5
Dependent Claim
17 words
Composite material as defined by claim 1, wherein the matrix further includes an acrylate or methacrylate polymer.
Claim 6
Dependent Claim
27 words
Composite material as defined by claim 1, wherein the superconductor powder comprises YBa 2 Cu 3 O 7-x where x is less than or equal to 1.
Claim 7
Dependent Claim
25 words
Composite material as defined by claim 1, wherein the superconductor powder is included in an amount of from about 20 to about 80 weight percent.
Claim 8
Dependent Claim
35 words
Composite material, comprising a matrix formed of polyvinylidene fluoride and a superconducting powder of the composition YBa 2 Cu 3 O 7-x where x is less than or equal to 1, dispersed in the matrix.
Claim 9
Dependent Claim
35 words
Composite material, comprising a matrix formed of polyvinylidene fluoride and a superconducting powder of the composition YBa 2 Cu 3 O 7-x where x is less than or equal to 1, dispersed in the matrix.
Claim 10
Dependent Claim
49 words
Composite material, comprising a matrix formed of a thermoplastic polymer and a superconductor power dispersed in the matrix, the superconductor powder comprising a mixed metal oxide amterial which exhibits the superconducting Meissner effect at temperatures greater than 77° K., the thermoplastic polymer comprising a vinylidene fluoride homopolymer or copolymer.
Claim 11
Dependent Claim
49 words
Composite material, comprising a matrix formed of a thermoplastic polymer and a superconductor power dispersed in the matrix, the superconductor powder comprising a mixed metal oxide amterial which exhibits the superconducting Meissner effect at temperatures greater than 77° K., the thermoplastic polymer comprising a vinylidene fluoride homopolymer or copolymer.
References Cited (Backward Citations)
US4152386A
Cited
US4647888A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1993-09-03 | 1994-03-05 | 1994-09-04 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1997-09-03 | 1998-03-05 | 1998-09-04 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2001-09-03 | 2002-03-05 | 2002-09-04 | $7700.00 | Window Closed / Lapsed |