US3346509A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Co-precipitated silica-alumina catalyst process and composition
Assignee: Gulf Research and Development Co
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Filing: 1964-06-12
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Granted: 1967-10-10
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Expires: 1984-06-12
Abstract
No abstract record available.
Inventors
- 👤 Meredith M Stewart
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 05:24
CPC Classifications
C; C10; C10G; C10G11/00; C10G11/02; C10G11/04; B; B01; B01J; B01J21/00; B01J21/12
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
100 words
A METHOD FOR PREPARING SILICA-ALUMINA COMPOSITIONS, THE METHOD COMPRISING (1) MIXING (A) A FRESHLY PREPARED SILICA SOL SUBSTANTIALLY FREE OF CATIONIC IMPURITIES AND HAVING A PH BETWEEN 1 AND 3.5, SAID SILICA SOL BEING IN AN UNSTABLE STATE TENDING TO TRANSFORM SPONTANEOUSLY INTO A GEL, AND CONTAINING THE EQUVALENT OF BETWEEN 1 AND 3 PERCENT BY WEIGHT OF SILICA AND (B) AN AQUEOUS SOLUTION OF A SUBSTANCE WHICH YIELDS ALUMINUM CATIONS IN AQUIOUS SOLUTION, SAID MIXING BEING CARRIED OUT BEFORE ADVANCEMENT OF POLYMERIZATION TOWARD FORMATION OF A GEL AND (2) RAISING THE PH OF THE RESULTANT MIXTURE TO CAUSE GELATION.
Claim 2
Independent Claim
100 words
A METHOD FOR PREPARING SILICA-ALUMINA COMPOSITIONS, THE METHOD COMPRISING (1) MIXING (A) A FRESHLY PREPARED SILICA SOL SUBSTANTIALLY FREE OF CATIONIC IMPURITIES AND HAVING A PH BETWEEN 1 AND 3.5, SAID SILICA SOL BEING IN AN UNSTABLE STATE TENDING TO TRANSFORM SPONTANEOUSLY INTO A GEL, AND CONTAINING THE EQUVALENT OF BETWEEN 1 AND 3 PERCENT BY WEIGHT OF SILICA AND (B) AN AQUEOUS SOLUTION OF A SUBSTANCE WHICH YIELDS ALUMINUM CATIONS IN AQUIOUS SOLUTION, SAID MIXING BEING CARRIED OUT BEFORE ADVANCEMENT OF POLYMERIZATION TOWARD FORMATION OF A GEL AND (2) RAISING THE PH OF THE RESULTANT MIXTURE TO CAUSE GELATION.
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) | 1970-10-09 | 1971-04-10 | 1971-10-10 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1974-10-09 | 1975-04-10 | 1975-10-10 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1978-10-09 | 1979-04-10 | 1979-10-10 | $7700.00 | Window Closed / Lapsed |