US4048290A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Process for the production of finely-divided metal and metalloid oxides
Assignee: Cabot Corp
•
Filing: 1976-01-28
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Granted: 1977-09-13
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Expires: 1996-01-28
Abstract
Abstract There is provided a process and apparatus for the production of finely-divided metal and metalloid oxides by flame hydrolysis of corresponding metal and metalloid halides whereby burner fouling is minimized and burner fabrication is facilitated by transpiration of a fuel gas or vapor along the boundaries of each halide-containing stream as it is discharged from the burner into a reaction zone.
Inventors
- 👤 Kam Bor Lee
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 10:35
CPC Classifications
C; C01; C01B; C01B33/00; C01B33/113; C01B33/12; C01B33/18; C01B33/181; C01B33/183; C01B13/00; C01B13/14; C01B13/20; C01B13/22; C01P; C01P2006/00; C01P2006/12
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
104 words
In a process for the production of finely-divided metal or metalloid oxides by vapor phase hydrolysis of corresponding metal or metalloid halide feedstocks in the presence of a flame provided by combustion of a hydrogen-containing fuel with an oxygen-containing gas, the improvement which comprises: flowing the feedstock vapor through burner means as one or more enclosed streams thereof and discharging it therefrom into a reaction zone, and at the dischange end of said burner means, transpiring through a porous diffusion means a hydrogen-containing fuel gas or vapor at a fouling preventive rate along and surrounding each boundary of each such enclosed feedstock vapor-containing steam.
Claim 2
Dependent Claim
104 words
In a process for the production of finely-divided metal or metalloid oxides by vapor phase hydrolysis of corresponding metal or metalloid halide feedstocks in the presence of a flame provided by combustion of a hydrogen-containing fuel with an oxygen-containing gas, the improvement which comprises: flowing the feedstock vapor through burner means as one or more enclosed streams thereof and discharging it therefrom into a reaction zone, and at the dischange end of said burner means, transpiring through a porous diffusion means a hydrogen-containing fuel gas or vapor at a fouling preventive rate along and surrounding each boundary of each such enclosed feedstock vapor-containing steam.
Claim 3
Dependent Claim
32 words
The process of claim 1 wherein said feedstock vapor is mixed with a hydrogen-containing fuel and an oxygen-containing gas to form a hydrolysis reactant mixture prior to discharge from said burner means.
Claim 4
Dependent Claim
20 words
The process of claim 2 wherein the reactant mixture is discharged from said burner means as a single stream thereof.
Claim 5
Dependent Claim
16 words
The process of claim 1 wherein said metal or metalloid halide feedstock is a silicon halide.
Claim 6
Dependent Claim
15 words
The process of claim 1 wherein said metal or metalloid halide feedstock is silicon tetrachloride.
Claim 7
Dependent Claim
11 words
The process of claim 1 wherein said transpirant fuel is hydrogen.
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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) | 1980-09-12 | 1981-03-14 | 1981-09-13 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1984-09-12 | 1985-03-14 | 1985-09-13 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1988-09-12 | 1989-03-14 | 1989-09-13 | $7700.00 | Window Closed / Lapsed |