US2819151A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Process for burning silicon fluorides to form silica
Assignee: Individual
•
Filing: 1954-06-17
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Granted: 1958-01-07
•
Expires: 1974-06-17
Abstract
No abstract record available.
Inventors
- 👤 Flemmert Gosta Lennart
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 17:39
CPC Classifications
B; B82; B82Y; B82Y30/00; C; C01; C01B; C01B33/00; C01B33/113; C01B33/12; C01B33/18; C01B33/181; C01B33/183; C01B33/184; C01B7/00; C01B7/19; C01B7/191; C01P; C01P2002/00; C01P2002/02; C01P2004/00; C01P2004/30; C01P2004/32; C01P2004/50; C01P2004/60; C01P2004/64
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
59 words
A PROCESS OF PRODUCING AMORPHOUS, FINELY-DIVIDED SILICA HAVING A MEAN PARTICLE SIZE WITHIN THE RANGE FROM ABOUT 5 TO ABOUT 50 MU WHICH COMPRISES REACTING IN THE GAS PHASE A SILICON FLUORIDE WITH A COMBUSTIBLE GAS AND A FREE OXYGEN-CONTAINING GAS IN A FLAME ZONE LIBERATING FROM 0.1 TO 1.3X10-*5 B. T. U.-*1 TO FORM SILICA AND HYDROGEN FLUORIDE.
Claim 2
Dependent Claim
59 words
A PROCESS OF PRODUCING AMORPHOUS, FINELY-DIVIDED SILICA HAVING A MEAN PARTICLE SIZE WITHIN THE RANGE FROM ABOUT 5 TO ABOUT 50 MU WHICH COMPRISES REACTING IN THE GAS PHASE A SILICON FLUORIDE WITH A COMBUSTIBLE GAS AND A FREE OXYGEN-CONTAINING GAS IN A FLAME ZONE LIBERATING FROM 0.1 TO 1.3X10-*5 B. T. U.-*1 TO FORM SILICA AND HYDROGEN FLUORIDE.
References Cited (Backward Citations)
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US1850286A
Cited
GB438782A
Cited
US2399687A
Cited
US2535036A
Cited
US2635946A
Cited
US2631083A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1961-01-06 | 1961-07-08 | 1962-01-07 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1965-01-06 | 1965-07-08 | 1966-01-07 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1969-01-06 | 1969-07-08 | 1970-01-07 | $7700.00 | Window Closed / Lapsed |