US4965244A
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CaF2 passivation layers for high temperature superconductors
Assignee: United States Department of the Navy
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Filing: 1988-09-19
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Granted: 1990-10-23
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Expires: 2008-09-19
Abstract
Abstract A CaF 2 passivation layer is applied on the surface of a superconducting oxide by evaporation which does not disrupt the superconductive properties of the superconducting oxide.
Inventors
- 👤 John H. Weaver
- 👤 Robert K. Grasselli
- 👤 David L. Nelson
- 👤 Harry M. Meyer, III
- 👤 Donald M. Hill
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 16:04
CPC Classifications
H; H10; H10N; H10N60/00; H10N60/01; H10N60/0268; H10N60/0661; H10N60/0716; C; C23; C23C; C23C14/00; C23C14/0021; C23C14/06; C23C14/08; C23C14/087; Y; Y10; Y10S; Y10S428/00; Y10S428/922; Y10S428/9265; Y10S428/93; Y10S505/00; Y10S505/725; Y10S505/73; Y10S505/732
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
37 words
A method comprising applying a passivation layer of CaF 2 to the surface of a superconductive ceramic oxide by evaporation, wherein said CaF 2 layer is effective to passivate said oxide surface without disrupting the superconductive properties.
Claim 2
Independent Claim
37 words
A method comprising applying a passivation layer of CaF 2 to the surface of a superconductive ceramic oxide by evaporation, wherein said CaF 2 layer is effective to passivate said oxide surface without disrupting the superconductive properties.
Claim 3
Dependent Claim
22 words
The method of claim 1 wherein said CaF 2 passivation layer is applied to the surface of a 2-1-4 superconductive ceramic oxide.
Claim 4
Dependent Claim
24 words
The method of claim 1 wherein said CaF 2 passivation layer is applied to the surface of a 1-2-3 superconductive ceramic oxide comprising Y.
Claim 5
Dependent Claim
24 words
The method of claim 1 wherein said CaF 2 passivation layer is applied to the surface of a 2-2-2-3 superconductive ceramic oxide comprising Bi.
Claim 6
Dependent Claim
24 words
The method of claim 1 wherein said CaF 2 passivation layer is applied to the surface of a 2-2-2-3 superconductive ceramic oxide comprising Tl.
Claim 7
Dependent Claim
37 words
The method of claim 1 wherein said CaF 2 passivation layer is applied to the surface of a superconductive ceramic oxide of the formula RBa 2 Cu 3 O 7-x , wherein R is a lanthenide element.
Claim 8
Dependent Claim
14 words
The method of claim 1 wherein the passivation layer is about 50-10,000Å in thickness.
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) | 1993-10-22 | 1994-04-23 | 1994-10-23 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1997-10-22 | 1998-04-23 | 1998-10-23 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2001-10-22 | 2002-04-23 | 2002-10-23 | $7700.00 | Window Closed / Lapsed |