US5017554A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Superconducting metal oxide Tl-Pb-Ca-Sr-Cu-O compositions and processes for manufacture and use
Assignee: EIDP Inc
•
Filing: 1989-08-15
•
Granted: 1991-05-21
•
Expires: 2009-08-15
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 16:34
CPC Classifications
C; C01; 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; Y; Y10; Y10S; Y10S505/00; Y10S505/775; Y10S505/776; Y10S505/783
Claims Analysis
Total Claims: 17
Claim 1
Independent Claim
157 words
A process for preparing a superconducting composition of the nominal formula Tl e Pb a Ca b Sr c Cu d O x wherein a is from about 1/10 to about 3/2, b is from about 1 to about 4, c is from about 1 to about 3, d is from about 1 to about 5, e is from about 3/10 to about 1 and x=(a+b+c+d+e+y) where y is from about 1/2 to about 3, said process consisting essentially of (i) forming a mixture of oxides of Tl, Pb, Ca, Sr and Cu, the relative amounts of said oxides chosen so that the atomic ratio of Tl:Pb:Ca:Sr:Cu is e:a:b:c:d; (ii) heating said mixture of oxides to a temperature of about 850° C. to about 940° C. in a controlled atmosphere and maintaining the mixture at said temperature in said atmosphere for about 3 to 12 hours to form said composition; and (iii) cooling and recovering said composition.
Claim 2
Dependent Claim
157 words
A process for preparing a superconducting composition of the nominal formula Tl e Pb a Ca b Sr c Cu d O x wherein a is from about 1/10 to about 3/2, b is from about 1 to about 4, c is from about 1 to about 3, d is from about 1 to about 5, e is from about 3/10 to about 1 and x=(a+b+c+d+e+y) where y is from about 1/2 to about 3, said process consisting essentially of (i) forming a mixture of oxides of Tl, Pb, Ca, Sr and Cu, the relative amounts of said oxides chosen so that the atomic ratio of Tl:Pb:Ca:Sr:Cu is e:a:b:c:d; (ii) heating said mixture of oxides to a temperature of about 850° C. to about 940° C. in a controlled atmosphere and maintaining the mixture at said temperature in said atmosphere for about 3 to 12 hours to form said composition; and (iii) cooling and recovering said composition.
Claim 3
Dependent Claim
35 words
The process of claim 1 wherein the controlled atmosphere is provided by placing, prior to heating, said mixture of oxides in a tube made of a non-reacting metal and then sealing the tube by welding.
Claim 4
Dependent Claim
11 words
The process of claim 2 wherein the non-reacting metal is gold.
Claim 5
Dependent Claim
23 words
The process of claim 1 wherein said mixture of oxides is heated to a temperature of about 860° C. to about 925° C.
Claim 6
Dependent Claim
23 words
The process of claim 3 wherein said mixture of oxides is heated to a temperature of about 860° C. to about 925° C.
Claim 7
Dependent Claim
21 words
The process of claim 4 wherein a+e is about 1, b and c are about 2 and d is about 3.
Claim 8
Dependent Claim
21 words
The process of claim 5 wherein a+e is about 1, b and c are about 2 and d is about 3.
Claim 9
Dependent Claim
12 words
The process of claim 6 wherein e=1/2, a=1/2, b=2, c=2 and d=3.
Claim 10
Dependent Claim
12 words
The process of claim 7 wherein e=1/2, a=1/2, b=2, c=2 and d=3.
Claim 11
Dependent Claim
12 words
The process of claim 6 wherein e=3/10, a=7/10, b=2, c=2 and d=3.
Claim 12
Dependent Claim
12 words
The process of claim 7 wherein e=3/10, a=7/10, b=2, c=2 and d=3.
Claim 13
Dependent Claim
12 words
The process of claim 6 wherein e=7/10, a=3/10, b=2, c=2 and d=3.
Claim 14
Dependent Claim
12 words
The process of claim 7 wherein e=7/10, a=3/10, b=2, c=2 and d=3.
Claim 15
Dependent Claim
83 words
An improved device based on the Josephson effect wherein the superconducting material comprises the composition of the nominal formula Tl e Pb a Ca b Sr c Cu d O x wherein a is from about 1/10 to about 3/2, b is from about 1 to about 4, c is from about 1 to about 3, d is from about 1 to about 5, e is from about 3/10 to about 1 and x=(a+b+c+d+e+y) where y is from about 1/2 to about 3.
Claim 16
Dependent Claim
83 words
An improved device based on the Josephson effect wherein the superconducting material comprises the composition of the nominal formula Tl e Pb a Ca b Sr c Cu d O x wherein a is from about 1/10 to about 3/2, b is from about 1 to about 4, c is from about 1 to about 3, d is from about 1 to about 5, e is from about 3/10 to about 1 and x=(a+b+c+d+e+y) where y is from about 1/2 to about 3.
Claim 17
Dependent Claim
11 words
The device of claim 14 wherein the device is a SQUID.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1994-05-20 | 1994-11-19 | 1995-05-21 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1998-05-20 | 1998-11-19 | 1999-05-21 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2002-05-20 | 2002-11-19 | 2003-05-21 | $7700.00 | Window Closed / Lapsed |