Patent US3753929A successfully refreshed from Google Patents.
US3753929A
Expired / Lapsed
US
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Strike incorporation of molecular sieves for fluid cracking catalysts
Assignee: Wyeth Holdings LLC
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Filing: 1970-09-16
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Granted: 1973-08-21
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Expires: 1990-09-16
Abstract
Abstract A PROCESS FOR PREPARING AN IMPROVED ALUMINOSILICATECONTAINING SILICA-ALUMINA HYDROCARBON CRACKING CATALYST COMPRISING ADDING AN ALKALI METAL SILICATE TO A MINERAL ACID UNTIL THE PH IS ABOVE 3.5, DISPERSING A CALCINED CRYSTALLINE ALUMINOSILICATE IN THE SILICA SOL, CONTINUING THE ADDITION OF ALKALI METAL SILICATE UNTIL GELATION OCCURS, AGING THE GEL, THEREAFTER ADJUSTING THE PH OF THE GEL TO 3.0 WITH AN ALUMINUM SALT, COATING THE ALUMINOSILICATE-SILICA SUBSTRATE, WASHING AT A PH OF 4.0, THEN WASHING WITH AMMONIA AT A PH OF ABOUT 7.0, AND DRYING THE FORMED PRODUCT.
Inventors
- 👤 J Lindsley
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 13:01
CPC Classifications
B; B01; B01J; B01J29/00; B01J29/04; B01J29/06; B01J29/08; B01J29/084
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1976-08-20 | 1977-02-19 | 1977-08-21 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-08-20 | 1981-02-19 | 1981-08-21 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-08-20 | 1985-02-19 | 1985-08-21 | $7700.00 | Window Closed / Lapsed |