US4952390A
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Superconductive oxide crystal and a production process thereof
Assignee: HUMIHIKO TAKEI
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Filing: 1988-06-30
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Granted: 1990-08-28
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Expires: 2008-06-30
Abstract
Abstract This invention concerns a novel superconductive oxide crystal and a production process thereof, the novel superconductive oxide crystal comprising a superconductive oxide crystal composed of a rare earth element, an alkaline earth meal, copper, and oxygen, in which copper (II) oxide (CuO)) is dispersed like detached islands.
Inventors
- 👤 Humihiko Takei
- 👤 Hiroyuki Takeya
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-09 07:12
CPC Classifications
C; C30; C30B; C30B29/00; C30B29/10; C30B29/16; C30B29/22; C30B29/225; C01; C01G; C01G3/00; C01G3/006; C04; C04B; C04B35/00; C04B35/01; C04B35/45; C04B35/4504; C30B11/00; C30B9/00; Y; Y10; Y10S; Y10S505/00; Y10S505/725
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
111 words
A process for the production of a superconductive oxide crystal comprising the steps of: mixing a copper compound with a first complex oxide powder, said first complex oxide powder comprising a rare earth element, an alkaline earth metal, copper and oxygen in proportions corresponding substantially to the theoretical composition of a superconductive oxide crystal; heating the mixture of said copper compound with said first complex oxide powder at a temperature in the range of from 950° C. to 1400° C. in an oxygen-containing atmosphere while contacting said mixture of said copper compound and said first complex oxide powder with a second oxide, said second oxide comprising substantially a rare earth oxide.
Claim 2
Dependent Claim
111 words
A process for the production of a superconductive oxide crystal comprising the steps of: mixing a copper compound with a first complex oxide powder, said first complex oxide powder comprising a rare earth element, an alkaline earth metal, copper and oxygen in proportions corresponding substantially to the theoretical composition of a superconductive oxide crystal; heating the mixture of said copper compound with said first complex oxide powder at a temperature in the range of from 950° C. to 1400° C. in an oxygen-containing atmosphere while contacting said mixture of said copper compound and said first complex oxide powder with a second oxide, said second oxide comprising substantially a rare earth oxide.
Claim 3
Dependent Claim
22 words
The process according to claim 1, wherein said first complex oxide powder is calcined prior to being mixed with said copper compound.
Claim 4
Dependent Claim
36 words
The process according to either one of claim 1 or 2, wherein said copper compound is selected from the group consisting of copper oxide and a compound convertible into CuO upon heating in an oxygen-containing atmosphere.
Claim 5
Dependent Claim
23 words
The process according to claim 3, wherein said compound convertible into CuO upon heating in an oxygen-containing atmosphere is an organic copper compound.
Claim 6
Dependent Claim
47 words
The process according to either one of claims 1 or 2 wherein said copper compound is mixed with said first oxide powder in an amount of 25-400 parts by weight, converted into copper (II) oxide (CuO), per 100 parts by weight of said first complex oxide powder.
Claim 7
Dependent Claim
43 words
The process according to claim 3 wherein said copper compound is mixed with said first complex oxide powder in an amount of 25-400 parts by weight, converted into copper (II) oxide (CuO), per 100 parts by weight of said first complex oxide powder.
Claim 8
Dependent Claim
43 words
The process according to claim 4 wherein said copper compound is mixed with said first complex oxide powder in an amount of 25-400 parts by weight, converted into copper (II) oxide (CuO), per 100 parts by weight of said first complex oxide powder.
References Cited (Backward Citations)
No citation records indexed.
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| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
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| 3.5 Years (Year 4) | 1993-08-27 | 1994-02-26 | 1994-08-28 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1997-08-27 | 1998-02-26 | 1998-08-28 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2001-08-27 | 2002-02-26 | 2002-08-28 | $7700.00 | Window Closed / Lapsed |