US4894361A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Superconducting metal oxide Tl-Pb-Ca-Sr-O compositions and processes for manufacture and use
Assignee: EIDP Inc
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Filing: 1988-08-24
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Granted: 1990-01-16
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Expires: 2008-08-24
Abstract
Abstract Compositions having the nominal formula Tl.sub.e Pb.sub.a Ca.sub.b Sr.sub.c Cu.sub.d O.sub.x wherein a is from about 1/10 to 3/2, b is from about 1 to 4, c is from about 1 to 3 d is from about 1 to 5 e is from about 3/10 to 1 x=(a+b+c+d+e+y) where y is from about 1/2 to 3, are superconducting. Processes for manufacturing such compositions and for using them are disclosed.
Inventors
- 👤 Munirpallam A. Subramanian
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 23:42
CPC Classifications
C; C01; C01F; C01F11/00; C01F11/02; C01G; C01G21/00; C01G21/006; H; H10; H10N; H10N60/00; H10N60/80; H10N60/85; H10N60/855; H10N60/857; C01P; C01P2002/00; C01P2002/70; C01P2002/72; C01P2002/77; C01P2004/00; C01P2004/80; C01P2004/82
Claims Analysis
Total Claims: 5
Claim 1
Independent Claim
70 words
A superconducting composition having the nominal formula Tl.sub.e Pb.sub.a Ca.sub.b Sr.sub.c Cu.sub.d O.sub.x wherein a is from about 1/10 to 3/2, b is from about 1 to 4, c is from about 1 to 3 d is from about 1 to 5 e is from about 3/10 to 1 x=(a+b+c+d+e+y) where y is from about 1/2 to 3, said composition having a superconducting transition temperature of at least 70 K.
Claim 2
Dependent Claim
70 words
A superconducting composition having the nominal formula Tl.sub.e Pb.sub.a Ca.sub.b Sr.sub.c Cu.sub.d O.sub.x wherein a is from about 1/10 to 3/2, b is from about 1 to 4, c is from about 1 to 3 d is from about 1 to 5 e is from about 3/10 to 1 x=(a+b+c+d+e+y) where y is from about 1/2 to 3, said composition having a superconducting transition temperature of at least 70 K.
Claim 3
Dependent Claim
39 words
A superconducting composition as in claim 1 wherein "a" is about 1/2, "b" is about 2, "c" is about 2, "d" is from about 3 to 4, "e" is about 1/2 and "y" is from about 1/2 to 2.
Claim 4
Dependent Claim
36 words
A superconducting composition as in claim 1 wherein "a" is about 7/10, "b" and "c" are each equal to 2, "d" is about 3, "e" is about 3/10 and "y" is from about 1/2 to 2.
Claim 5
Dependent Claim
57 words
A method for conducting an electrical current within a conductor material without electrical resistive losses comprising the steps of: cooling a conductor material composed of a composition of claim 1 to a temperature below the T c of said composition; initiatiing a flow of electrical current within said conductor material while maintaining said material below said temperature.
References Cited (Backward Citations)
US3932315A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
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| 3.5 Years (Year 4) | 1993-01-15 | 1993-07-17 | 1994-01-16 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1997-01-15 | 1997-07-17 | 1998-01-16 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2001-01-15 | 2001-07-17 | 2002-01-16 | $7700.00 | Window Closed / Lapsed |