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US3642453A
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Process for the production of finely divided silica
Assignee: Monsanto Chemicals Ltd
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Filing: 1969-08-08
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Granted: 1972-02-15
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Expires: 1989-08-08
Abstract
Abstract A stream of hot gas from a plasma generator is contacted with a surface of a body comprising silica to form a molten zone from which evaporation of silica occurs into the gas stream, the stream is subsequently quenched by the introduction of cooling gas, and silica in finely divided form is separated from the stream.
Inventors
- 👤 Henry Thomas Joseph Chilton
- 👤 David Anthony Everest
- 👤 Ian George Sayce
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-09 03:29
CPC Classifications
F; F28; F28C; F28C3/00; F28C3/06; B; B01; B01D; B01D51/00; B01D51/10; C; C01; C01B; C01B33/00; C01B33/113; C01B33/12; C01B33/18; C01B33/181; C09; C09C; C09C1/00; C09C1/28; C09C1/30; C09C1/3009; C09C3/00; C09C3/04; C09C3/048; C01P; C01P2006/00; C01P2006/12
Claims Analysis
Total Claims: 3
Claim 1
Independent Claim
14 words
A process according to claim 1 in which the cooling gas contains water vapor.
Claim 2
Dependent Claim
30 words
A process according to claim 2 in which the cooling gas is introduced into the hot gas at a flow rate of at least half that of the hot gas.
Claim 3
Dependent Claim
26 words
A process according to claim 3 in which the flow rate of the cooling gas is from 10 to 20 times that of the hot gas.
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) | 1975-02-14 | 1975-08-16 | 1976-02-15 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-02-14 | 1979-08-16 | 1980-02-15 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-02-14 | 1983-08-16 | 1984-02-15 | $7700.00 | Window Closed / Lapsed |