US2496736A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Manufacture of precipitated silica
Assignee: Individual
•
Filing: 1942-10-10
•
Granted: 1950-02-07
•
Expires: 1962-10-10
Abstract
No abstract record available.
Inventors
- 👤 William T Maloney
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 00:51
CPC Classifications
C; C01; C01B; C01B33/00; C01B33/113; C01B33/12; C01B33/18; C01B33/187; C01B33/193; C01P; C01P2002/00; C01P2002/02; C01P2004/00; C01P2004/50; C01P2006/00; C01P2006/19
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
117 words
THE PROCESS OF PREPARING PRECIPITATED SILICA IN THE FORM OF AN AMORPHOUS, FINE, GRANULAR PRODUCT CHARACTERIZED BY HIGH OIL ADSORPTIVITY, WHEN COMPRISES BRINGING AN ALKALI METAL SILICATE INTO CONTACT WITH SULFUIC ACID IN AN AQUEOUS SOLUTION, THE PROPORTIONS AND CONCENTRATIONS OF ALKALI SILICATE AND SULFURIC ACID BROUGHT INTO SAID SOLUTION BEING AT LEAST 204 GRAMS OF SODIUM SILICATE, CALCULATED AS NA20.336 SI02, AND 38 GRAMS OF H2SO4 PER LITER OF THE SOLUTION, SUBJECTING THE REACTION MIXTURE TO VIGOROUS AGITATION WHILE MAINTAINING A TEMPERATURE OF AT LEAST 120* F. IN THE REACTION ZONE AND THEREBY CAUSING PRECIPITATION OF THE SILICA AND FORMATION OF ALKALI METAL SULFATE, AND THEREAFTER SEPARATING THE SILICA FROM THE SULFATE, AND DRYING THE SILICA.
Claim 2
Dependent Claim
117 words
THE PROCESS OF PREPARING PRECIPITATED SILICA IN THE FORM OF AN AMORPHOUS, FINE, GRANULAR PRODUCT CHARACTERIZED BY HIGH OIL ADSORPTIVITY, WHEN COMPRISES BRINGING AN ALKALI METAL SILICATE INTO CONTACT WITH SULFUIC ACID IN AN AQUEOUS SOLUTION, THE PROPORTIONS AND CONCENTRATIONS OF ALKALI SILICATE AND SULFURIC ACID BROUGHT INTO SAID SOLUTION BEING AT LEAST 204 GRAMS OF SODIUM SILICATE, CALCULATED AS NA20.336 SI02, AND 38 GRAMS OF H2SO4 PER LITER OF THE SOLUTION, SUBJECTING THE REACTION MIXTURE TO VIGOROUS AGITATION WHILE MAINTAINING A TEMPERATURE OF AT LEAST 120* F. IN THE REACTION ZONE AND THEREBY CAUSING PRECIPITATION OF THE SILICA AND FORMATION OF ALKALI METAL SULFATE, AND THEREAFTER SEPARATING THE SILICA FROM THE SULFATE, AND DRYING THE SILICA.
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) | 1953-02-06 | 1953-08-08 | 1954-02-07 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1957-02-06 | 1957-08-08 | 1958-02-07 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1961-02-06 | 1961-08-08 | 1962-02-07 | $7700.00 | Window Closed / Lapsed |