US2601235A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Process for producing built-up silica particles
Assignee: EIDP Inc
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Filing: 1949-06-15
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Granted: 1952-06-24
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Expires: 1969-06-15
Abstract
No abstract record available.
Inventors
- 👤 Guy B Alexander
- 👤 Ralph K Iler
- 👤 Frederick J Wolter
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 23:29
CPC Classifications
C; C01; C01B; C01B33/00; C01B33/113; C01B33/12; C01B33/18; B; B82; B82Y; B82Y30/00; C01B33/14; C01B33/141; C01B33/142; C01B33/143; C01P; C01P2004/00; C01P2004/30; C01P2004/32; C01P2004/50; C01P2004/60; C01P2004/62; C01P2004/64
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
141 words
IN A PROCESS FOR PRODUCING BUILT-UP SILICA THE STEPS COMPRISING HEATING A HEEL OF SILICA SOL ABOVE 60* C. TO MAKE NUCLEI OF HIGH MOLECULAR WEIGHT SILICA, MIXING SAID NUCLEI WITH AN AQUEOUS DISPERSION OF ACTIVE SILICA MADE BY VIGOROUSLY AGITATING AN ALKALI METAL SILICATE SOLUTION WITH ENOUGH ACID TO GIVE A PH OF 8 TO 10.7, THE ALKALI METAL ION CONCENTRATION BEING BELOW 1 NORMAL IN THE PRESENCE OF THE ACTIVE SILICA AND THE RATE OF ADDING THE ACTIVE SILICA TO THE NUCLEI BEING NOT GREATER THAN THAT AT WHICH THE NUCLEI CAN CONDENSE WITH IT, AND HEATING THE MIXTURE OF NUCLEI AND ACTIVE SILICA ABOVE 60* C. AT A PH OF 8 TO 10.7, WHEREBY THE ACTIVE SILICA ACCRETES TO THE NUCLEI, PRECIPITATING THE SILICA PRODUCT FORMED BY THE ACCRETION PROCESS, AND SEPARATING THE PRECIPITATE FROM THE REACTION MIXTURE.
Claim 2
Dependent Claim
141 words
IN A PROCESS FOR PRODUCING BUILT-UP SILICA THE STEPS COMPRISING HEATING A HEEL OF SILICA SOL ABOVE 60* C. TO MAKE NUCLEI OF HIGH MOLECULAR WEIGHT SILICA, MIXING SAID NUCLEI WITH AN AQUEOUS DISPERSION OF ACTIVE SILICA MADE BY VIGOROUSLY AGITATING AN ALKALI METAL SILICATE SOLUTION WITH ENOUGH ACID TO GIVE A PH OF 8 TO 10.7, THE ALKALI METAL ION CONCENTRATION BEING BELOW 1 NORMAL IN THE PRESENCE OF THE ACTIVE SILICA AND THE RATE OF ADDING THE ACTIVE SILICA TO THE NUCLEI BEING NOT GREATER THAN THAT AT WHICH THE NUCLEI CAN CONDENSE WITH IT, AND HEATING THE MIXTURE OF NUCLEI AND ACTIVE SILICA ABOVE 60* C. AT A PH OF 8 TO 10.7, WHEREBY THE ACTIVE SILICA ACCRETES TO THE NUCLEI, PRECIPITATING THE SILICA PRODUCT FORMED BY THE ACCRETION PROCESS, AND SEPARATING THE PRECIPITATE FROM THE REACTION MIXTURE.
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) | 1955-06-24 | 1955-12-24 | 1956-06-24 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1959-06-24 | 1959-12-24 | 1960-06-24 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1963-06-24 | 1963-12-24 | 1964-06-24 | $7700.00 | Window Closed / Lapsed |