US2763533A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Silica-containing gels
Assignee: Wyeth Holdings LLC
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Filing: 1952-12-31
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Granted: 1956-09-18
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Expires: 1972-12-31
Abstract
No abstract record available.
Inventors
- 👤 Kenneth D Ashley
- 👤 William B Innes
- 👤 Emerson V Paul
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 12:55
CPC Classifications
C; C01; C01B; C01B33/00; C01B33/113; C01B33/12; C01B33/14; C01B33/152; C01B33/154
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
148 words
IN A METHOD OF PREPARING A SILICA-CONTAINING GEL WHICH COMPRISES FORMING A SILICA GEL SLURRY, DEWATERING, WASHING AND DRYING THE SAME, THE IMPROVEMENT WHICH COMPIRSES FORMING THE SILICA GEL SLURRY BY DILUTING A COMMERCIAL SODIUM SILICATE SOLUTION TO 3-12% SIO2, ADDING SAID DILUTED SODIUM SILICATE SOLUTION TO A MINERAL ACID TO FORM A SILICIC ACID SOLUTION WITHIN THE PH RANGE OF 1.0-4.5, AND SUBSTANTIALLY SIMULTANEOUSLY ADMIXING WITH AGITATION AND IN THE PRESENCE OF A HEEL CONSISTING OF A PORTION OF A SILICA GEL SLURRY FROM A PREVIOUS RUN SAID SILICIC ACID SOLUTION WITH ADDITIONAL DILUTED SODIUM SILICATE SOLUTION COMTAINING 3-12% SIO2 IN SUCH PROPORTIONS AS TO MAINTAIN A PH OF 6.0-8.5 DURING SUCH ADMIXTURE TO FORM A SILICA GEL SLURRY WHICH IS CAPABLE OF CONVERSION BY DEWATERING, WASHING AND DRYING INTO A LOW APPARENT BULK DENSITY SILICACONTAINING GEL WHICH IS EASILY DISINTEGRABLE INTO A VERY FINE PARTICLE SIZE.
Claim 2
Dependent Claim
148 words
IN A METHOD OF PREPARING A SILICA-CONTAINING GEL WHICH COMPRISES FORMING A SILICA GEL SLURRY, DEWATERING, WASHING AND DRYING THE SAME, THE IMPROVEMENT WHICH COMPIRSES FORMING THE SILICA GEL SLURRY BY DILUTING A COMMERCIAL SODIUM SILICATE SOLUTION TO 3-12% SIO2, ADDING SAID DILUTED SODIUM SILICATE SOLUTION TO A MINERAL ACID TO FORM A SILICIC ACID SOLUTION WITHIN THE PH RANGE OF 1.0-4.5, AND SUBSTANTIALLY SIMULTANEOUSLY ADMIXING WITH AGITATION AND IN THE PRESENCE OF A HEEL CONSISTING OF A PORTION OF A SILICA GEL SLURRY FROM A PREVIOUS RUN SAID SILICIC ACID SOLUTION WITH ADDITIONAL DILUTED SODIUM SILICATE SOLUTION COMTAINING 3-12% SIO2 IN SUCH PROPORTIONS AS TO MAINTAIN A PH OF 6.0-8.5 DURING SUCH ADMIXTURE TO FORM A SILICA GEL SLURRY WHICH IS CAPABLE OF CONVERSION BY DEWATERING, WASHING AND DRYING INTO A LOW APPARENT BULK DENSITY SILICACONTAINING GEL WHICH IS EASILY DISINTEGRABLE INTO A VERY FINE PARTICLE SIZE.
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) | 1959-09-18 | 1960-03-19 | 1960-09-18 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1963-09-18 | 1964-03-19 | 1964-09-18 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1967-09-18 | 1968-03-19 | 1968-09-18 | $7700.00 | Window Closed / Lapsed |