Patent US2737446A successfully refreshed from Google Patents.
US2737446A
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Process for the production of finely divided silica and alkali formates
Assignee: Evonik Operations GmbH
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Filing: 1953-04-20
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Granted: 1956-03-06
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Expires: 1973-04-20
Abstract
No abstract record available.
Inventors
- 👤 Hoffmann Ulrich
- 👤 Veith Hermann
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 06:02
CPC Classifications
C; C10; C10M; C10M5/00; C01; C01B; C01B33/00; C01B33/113; C01B33/12; C01B33/18; C01B33/187; C01B33/193; C07; C07C; C07C51/00; C07C51/10; C09; C09C; C09C1/00; C09C1/28; C09C1/30; C09C1/3063; C01P; C01P2006/00; C01P2006/11; C01P2006/22; C01P2006/80; C01P2006/90; C10M2201/00; C10M2201/04; C10M2201/041; C10M2201/06; C10M2201/062; C10M2201/10; C10M2201/105; C10N; C10N2050/00; C10N2050/10
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
58 words
A PROCESS FOR THE PRODUCTION OF FINELY DIVIDED SILICA AND AN ALKALI METAL FORMATE WHICH COMPRISES REACTING AN AQUEOUS SOLUTION OF AN ALKALI METAL SILICATE WITH CARBON MONOXIDE AT A TEMPERATURE OVER 100*C. AND AT AN ELEVATED PRESSURE OF AT LEAST 10 ATMOSPHERES AND SEPARATING THE PRECIPITATED SILICA FROM THE REACTION SOLUTION CONTAINING THE ALKALI METAL FORMATE FORMED.
Claim 2
Dependent Claim
58 words
A PROCESS FOR THE PRODUCTION OF FINELY DIVIDED SILICA AND AN ALKALI METAL FORMATE WHICH COMPRISES REACTING AN AQUEOUS SOLUTION OF AN ALKALI METAL SILICATE WITH CARBON MONOXIDE AT A TEMPERATURE OVER 100*C. AND AT AN ELEVATED PRESSURE OF AT LEAST 10 ATMOSPHERES AND SEPARATING THE PRECIPITATED SILICA FROM THE REACTION SOLUTION CONTAINING THE ALKALI METAL FORMATE FORMED.
References Cited (Backward Citations)
US820159A
Cited
US993331A
Cited
GB190804471A
Cited
US1833865A
Cited
US2023003A
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US2348072A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1959-03-06 | 1959-09-05 | 1960-03-06 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1963-03-06 | 1963-09-05 | 1964-03-06 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1967-03-06 | 1967-09-05 | 1968-03-06 | $7700.00 | Window Closed / Lapsed |