US4764357A
Expired / Lapsed
US
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Process for producing finely divided powdery metal oxide compositions
Assignee: Akzo America Inc
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Filing: 1987-05-08
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Granted: 1988-08-16
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Expires: 2007-05-08
Abstract
Abstract A finely divided metal oxide powdery composition, preferably with a narrow particle size distribution, is produced from a particulate, sol-gel derived composition containing agglomerates by heating the particulate composition in the presence of an effective amount of a composition which decomposes upon heating and forms a gas to break at least a portion of the agglomerates so as to yield the desired finely divided ceramic particle composition. Examples of suitable gas-forming agents for use in the present invention include the ammonium salts or amides of organic and inorganic acids, volatile acids, and gases dissolved in a suitable solvent, such as water, alcohol or ammonia.
Inventors
- 👤 Fawzy G. Sherif
- 👤 Francis A. Via
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 18:21
CPC Classifications
C; C04; C04B; C04B35/00; C04B35/01; C04B35/48; C04B35/486; C01; C01B; C01B13/00; C01B13/14; C01B13/18; C01B13/32; C01B33/00; C01B33/113; C01B33/12; C01B33/14; C01B33/152; C01B33/154; C01B33/1546; C01B33/16; C01B33/163; C01B33/18; C01B35/00; C01B35/08; C01B35/10; C01B35/1027; C01B35/1036; C01F; C01F5/00; C01F5/02; C01F7/00; C01F7/02; C01F7/021; C01F7/025; C01F7/30; C01G; C01G19/00; C01G19/02; C01G23/00; C01G23/04; C01G23/047; C01G23/053; C01G25/00; C01G25/02; C04B35/622; C04B35/624; C04B35/626; H; H10; H10N; H10N60/00; H10N60/01; H10N60/0268; H10N60/80; H10N60/85; H10N60/855; C01P; C01P2004/00; C01P2004/50; C01P2004/51; C01P2004/52; C01P2004/60; C01P2004/61; C01P2006/00; C01P2006/40; Y; Y10; Y10S; Y10S420/00; Y10S420/901
Claims Analysis
Total Claims: 14
Claim 1
Independent Claim
71 words
A process for producing a finely divided powdery metal oxide composition which comprises heating a particulate, sol-gel derived metal oxide composition, which contains agglomerates, and to which has been added an effective amount of a composition which decomposes at the temperature to which the metal oxide composition is heated to form a gas to break at least a portion of said agglomerates and to thereby yield said finely divided powdery composition.
Claim 2
Dependent Claim
71 words
A process for producing a finely divided powdery metal oxide composition which comprises heating a particulate, sol-gel derived metal oxide composition, which contains agglomerates, and to which has been added an effective amount of a composition which decomposes at the temperature to which the metal oxide composition is heated to form a gas to break at least a portion of said agglomerates and to thereby yield said finely divided powdery composition.
Claim 3
Dependent Claim
23 words
A process as claimed in claim 1 wherein the composition which decomposes and forms a gas is an ammonium salt of an acid.
Claim 4
Dependent Claim
19 words
A process as claimed in claim 1 wherein the composition which decomposes and forms a gas is an amide.
Claim 5
Dependent Claim
23 words
A process as claimed in claim 1 wherein the composition which decomposes and forms a gas is a gas dissolved in a solvent.
Claim 6
Dependent Claim
20 words
A process as claimed in claim 1 wherein the composition which decomposes and forms a gas is a volatile acid.
Claim 7
Dependent Claim
19 words
A process as claimed in claim 1 wherein the composition which decomposes and forms a gas is ammonium carbonate.
Claim 8
Dependent Claim
19 words
A process as claimed in claim 1 wherein the composition which decomposes and forms a gas is ammonium nitrite.
Claim 9
Dependent Claim
22 words
A process as claimed in claim 1 wherein the average particle size of the powdery composition is less than about 5 microns.
Claim 10
Dependent Claim
31 words
A process as claimed in claim 1 wherein the particulate composition is prepared from alkoxides or soluble salts of the elements of zirconium, titanium, magnesium, yttrium, boron, tin, silicon and aluminum.
Claim 11
Dependent Claim
13 words
A process as claimed in claim 1 wherein the particulate composition comprises zirconia.
Claim 12
Dependent Claim
13 words
A process as claimed in claim 1 wherein the particulate composition comprises alumina.
Claim 13
Dependent Claim
13 words
A process as claimed in claim 1 wherein the particulate composition comprises silica.
Claim 14
Dependent Claim
15 words
A process as claimed in claim 1 wherein the metal oxide composition has superconductive properties.
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) | 1991-08-16 | 1992-02-15 | 1992-08-16 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1995-08-16 | 1996-02-15 | 1996-08-16 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1999-08-16 | 2000-02-15 | 2000-08-16 | $7700.00 | Window Closed / Lapsed |