US4298387A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Agglomerated mixtures of highly dispersed metal oxides and opacifiers
Assignee: Consortium fuer Elektrochemische Industrie GmbH
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Filing: 1979-12-11
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Granted: 1981-11-03
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Expires: 1999-12-11
Abstract
Abstract An agglomerated mixture includes 30-95% by weight of highly dispersed metal oxides produced by flame hydrolysis and 5-70% by weight of inorganic opacifiers that have at least one absorption maximum in the range between 1.5 and 10 μm, selected from the group consisting of inorganic oxides and mixed oxides, carbides and nitrides. The invention also relates to a process of manufacturing the mixtures and to their use as heat-insulating material and the like.
Inventors
- 👤 Gunter Kratel
- 👤 Hans Katzer
- 👤 Stephan Loskot
- 👤 Wilfried Lang
- 👤 Klaus Weis
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 02:05
CPC Classifications
F; F16; F16L; F16L59/00; F16L59/02; F16L59/028; C; C04; C04B; C04B30/00
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
143 words
In a process for the manufacture of an agglomerated mixture comprising 30-95% by weight of highly dispersed metal oxides produced by flame hydrolysis and 5-70% by weight of inorganic opacifiers that have at least one absorption maximum in the range between 1.5 and 10 μm, selected from the group consisting or inorganic oxides and mixed oxides, carbides and nitrides wherein volatile metal compounds are initially flame hydrolyzed in a combustion zone where they react with a flame to form highly dispersed metal oxides and are then agglomerated in an agglomeration plant, the improvement comprising the steps of: continuously mixing said inorganic opacifiers with said flame-hydrolyzed metal oxides in the aforesaid percentages in a region in which the flame-hydrolyzed metal oxides are still in the form of primary particles; and coagglomerating said inorganic opacifiers while agglomerating said metal oxides subsequent to the flame hydrolysis.
Claim 2
Dependent Claim
143 words
In a process for the manufacture of an agglomerated mixture comprising 30-95% by weight of highly dispersed metal oxides produced by flame hydrolysis and 5-70% by weight of inorganic opacifiers that have at least one absorption maximum in the range between 1.5 and 10 μm, selected from the group consisting or inorganic oxides and mixed oxides, carbides and nitrides wherein volatile metal compounds are initially flame hydrolyzed in a combustion zone where they react with a flame to form highly dispersed metal oxides and are then agglomerated in an agglomeration plant, the improvement comprising the steps of: continuously mixing said inorganic opacifiers with said flame-hydrolyzed metal oxides in the aforesaid percentages in a region in which the flame-hydrolyzed metal oxides are still in the form of primary particles; and coagglomerating said inorganic opacifiers while agglomerating said metal oxides subsequent to the flame hydrolysis.
Claim 3
Dependent Claim
57 words
An agglomerated mixture made according to claim 1 comprising: 30-95% by weight of higly dispersed metal oxides produced by flame hydrolysis; and 5-70% by weight of inorganic opacifiers that have at least one absorption maximum in the range between 1.5 and 10 μm, selected from the group consisting of inorganic oxides and mixed oxides, carbides and nitrides.
Claim 4
Dependent Claim
35 words
The mixture according to claim 2, wherein said highly dispersed metal oxides are selected from the group consisting of highly dispersed silicon dioxide, a silicon dioxide-containing admixture of metal oxides and a silicon-containing mixed oxide.
Claim 5
Dependent Claim
65 words
A heat-insulating material comprising, in mechanically compressed form, an agglomerated mixture made according to claim 1 comprising 30-95% by weight of highly dispersed metal oxides produced by flame hydrolysis and 5-70% by weight of inorganic opacifiers that have at least one absorption maximum in the range between 1.5 and 10 μm, selected from the group consisting of inorganic oxides and mixed oxides, carbides and nitrides.
Claim 6
Dependent Claim
21 words
The heat-insulating material according to claim 4, wherein said agglomerated mixture additionally includes up to 5% by weight of a binder.
Claim 7
Dependent Claim
29 words
The process according to claim 1, wherein said inorganic opacifiers are continuously added to said metal oxides in said combustion zone during the manufacture of the flame-hydrolyzed metal oxides.
Claim 8
Dependent Claim
25 words
The process according to claim 1, wherein said inorganic opacifiers are continuously added to said metal oxides in the first one-third of the agglomeration plant.
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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) | 1984-11-02 | 1985-05-04 | 1985-11-03 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1988-11-02 | 1989-05-04 | 1989-11-03 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1992-11-02 | 1993-05-04 | 1993-11-03 | $7700.00 | Window Closed / Lapsed |