US4956339A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method for manufacturing superconducting ceramics in a magnetic field
Assignee: Semiconductor Energy Laboratory Co Ltd
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Filing: 1988-09-20
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Granted: 1990-09-11
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Expires: 2008-09-20
Abstract
Abstract A method and an apparatus for fabricating single crystals of superconducting ceramics are described. A powedered row oxide mixture is placed and molten in a melting pot. The surface of the molten mixture is approximately at the freezing point of the mixture. From the surface, a single crystal is pulled in accordance with the known pulling crystal technique. The pulled mixture is subjected to a magnetic field normal to the pulling direction. By virtue of the magnetic field, single crystal superconducting oxide ceramics can be obtained without twin crystals.
Inventors
- 👤 Shunpei Yamazaki
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-09 04:27
CPC Classifications
H; H10; H10N; H10N60/00; H10N60/01; H10N60/0268; Y; Y10; Y10S; Y10S420/00; Y10S420/901; Y10S505/00; Y10S505/725; Y10S505/729; Y10T; Y10T117/00; Y10T117/10; Y10T117/1024; Y10T117/1032
Claims Analysis
Total Claims: 10
Claim 1
Independent Claim
53 words
A method of fabricating single crystals of superconducting ceramics comprising: melting a magnetic copper based oxide mixture conforming to a composition required for superconduction; applying a magnetic field to said molten oxide mixture in a fixed direction; freezing said molten mixture in said magnetic field and then forming a superconducting ceramic single crystal.
Claim 2
Independent Claim
53 words
A method of fabricating single crystals of superconducting ceramics comprising: melting a magnetic copper based oxide mixture conforming to a composition required for superconduction; applying a magnetic field to said molten oxide mixture in a fixed direction; freezing said molten mixture in said magnetic field and then forming a superconducting ceramic single crystal.
Claim 3
Dependent Claim
19 words
The method of claim 1 wherein said freezing step is carried out in accordance with the pulling crystal technique.
Claim 4
Dependent Claim
18 words
The method of claim 1 further comprising the step of aggitating said molten mixture during said freezing step.
Claim 5
Dependent Claim
20 words
The method of claim 2 wherein said magnetic field is applied across the pulled crystal in a perpendicular direction thereto.
Claim 6
Dependent Claim
19 words
The method of claim 2 wherein said magnetic field is perpendicular to the C plane of said single crystal.
Claim 7
Dependent Claim
18 words
The method of claim 2 wherein the direction of said magnetic field is rotated about the pulling direction.
Claim 8
Dependent Claim
16 words
The method of claim 2 further comprising the step of supplying oxygen into said molten mixture.
Claim 9
Dependent Claim
32 words
The method of claim 2 wherein the seed crystal used for said pulling crystal technique is oriented so that the growth direction of said superconducting crystal is normal to the C plane.
Claim 10
Dependent Claim
21 words
The method of claim 3 wherein said aggitating step is performed by applying a rotating magnetic field to the molten mixture.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1993-09-10 | 1994-03-12 | 1994-09-11 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1997-09-10 | 1998-03-12 | 1998-09-11 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2001-09-10 | 2002-03-12 | 2002-09-11 | $7700.00 | Window Closed / Lapsed |