US2798792A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method for the production of finely divided silicon dioxide
Assignee: Helsingborgs Gummifabriks AB
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Filing: 1950-07-03
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Granted: 1957-07-09
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Expires: 1970-07-03
Abstract
No abstract record available.
Inventors
- 👤 Stelling Per Otto
- 👤 Flemmert Gosta Lennart
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 06:19
CPC Classifications
C; C01; C01B; C01B33/00; C01B33/113; C01B33/12; C01B33/18; C01B33/181; C01B33/183; C01P; C01P2004/00; C01P2004/60; C01P2004/61
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
64 words
IN A PROCESS OF MAKING FINELY DIVIDED SILICON DIOXIDE THE STEPS OF REACTING AT A TEMPERATURE OF AT LEAST 650* C. A SILICIOUS SUBSTANCE SELECTED FROM THE GROUP CONSISTING OF SILICON AND SILICON ALLOYS WITH DRY HYDROCHLORIC ACID TO FORM A GASEOUS MIXTURE OF CHLORINE CONTAINING SILICON COMPOUNDS AND HYDROGEN AND SUBJECTING THE GASEOUS CHLORINE CONTAINING SILICON COMPOUNDS IN SAID GASEOUS MIXTURE TO HYDROLYSIS.
Claim 2
Dependent Claim
64 words
IN A PROCESS OF MAKING FINELY DIVIDED SILICON DIOXIDE THE STEPS OF REACTING AT A TEMPERATURE OF AT LEAST 650* C. A SILICIOUS SUBSTANCE SELECTED FROM THE GROUP CONSISTING OF SILICON AND SILICON ALLOYS WITH DRY HYDROCHLORIC ACID TO FORM A GASEOUS MIXTURE OF CHLORINE CONTAINING SILICON COMPOUNDS AND HYDROGEN AND SUBJECTING THE GASEOUS CHLORINE CONTAINING SILICON COMPOUNDS IN SAID GASEOUS MIXTURE TO HYDROLYSIS.
References Cited (Backward Citations)
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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) | 1960-07-08 | 1961-01-07 | 1961-07-09 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1964-07-08 | 1965-01-07 | 1965-07-09 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1968-07-08 | 1969-01-07 | 1969-07-09 | $7700.00 | Window Closed / Lapsed |