US4863521A
Expired / Lapsed
US
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Spray drying monocarboxylate mixtures
Assignee: WR Grace and Co Conn
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Filing: 1988-07-07
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Granted: 1989-09-05
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Expires: 2008-07-07
Abstract
Abstract An aqueous solution of the monocarboxylates of Y, Ba, and Cu is spray dried, providing a contaminant-free non-hygroscopic product which is homogeneous at the atomic level. In a preferred embodiment Y, Ba, and Cu acetates are used in a molecular ratio of 1:2:3, giving a product which can be calcined to give a superconducting mixed oxide, YBa 2 Cu 3 O x , where x is 6.8-7.0.
Inventors
- 👤 Jacob Block
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-09 04:19
CPC Classifications
C; C04; C04B; C04B35/00; C04B35/01; C04B35/45; C04B35/4504; C01; C01G; C01G15/00; C01G15/006; C01G3/00; C01G3/006; C04B35/4512; H; H10; H10N; H10N60/00; H10N60/01; H10N60/0268; C01P; C01P2004/00; C01P2004/30; C01P2004/32; C01P2004/60; C01P2004/61; Y; Y10; Y10S; Y10S428/00; Y10S428/922; Y10S428/9265; Y10S428/93; Y10S505/00; Y10S505/80; Y10S505/801; Y10S505/809; Y10S505/81; Y10S505/815; Y10T; Y10T428/00; Y10T428/29; Y10T428/2982
Claims Analysis
Total Claims: 5
Claim 1
Independent Claim
32 words
Spray-dried, free flowing, non-hygroscopic particles consisting essentially of a homogeneous mixture of monocarboxylates of Y, Ba, and Cu, said monocarboxylates being selected from the group consisting of formates, acetates, propionates, and butyrates.
Claim 2
Dependent Claim
32 words
Spray-dried, free flowing, non-hygroscopic particles consisting essentially of a homogeneous mixture of monocarboxylates of Y, Ba, and Cu, said monocarboxylates being selected from the group consisting of formates, acetates, propionates, and butyrates.
Claim 3
Dependent Claim
10 words
Composition according to claim 1 wherein the monocarboxylates are acetates.
Claim 4
Dependent Claim
19 words
Composition according to claim 2 wherein the molecular ratio of acetates is Y 1 -Ba 2 -Cu 3 .
Claim 5
Dependent Claim
14 words
Composition according to claim 3 wherein the particles are about 2-13 microns in diameter.
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) | 1992-09-04 | 1993-03-06 | 1993-09-05 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1996-09-04 | 1997-03-06 | 1997-09-05 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2000-09-04 | 2001-03-06 | 2001-09-05 | $7700.00 | Window Closed / Lapsed |