Patent US3575887A successfully refreshed from Google Patents.
US3575887A
Expired / Lapsed
US
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Fluoride-containing crystalline alumino-silicates
Assignee: Shell USA Inc
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Filing: 1968-03-19
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Granted: 1971-04-20
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Expires: 1988-03-19
Abstract
Abstract A NOVEL CRYSTALLINE ALUMINO-SILICATE CONTAINING FLUORINE INCORPORATED INTO THE CRYSTALLINE STRUCTURE IS PREPARED BY TREATMENT OF AN ALUMINO-SILICATE SEQUENTIALLY WITH A DILUTE NON-FLUORIDE ACID SOLUTION FOLLOWED BY TREATMENT WITH A HALOGEN SOLUTION CONTAINING FLUORIDE AND CHLORIDE IONS. THE FLUORIDE-CONTAINING ALUMINO-SILICATES ARE HIGHLY ACTIVE AND STABLE HYDROCONVERSION CATALYSTS ESPECIALLY WHEN COMPOSITED WITH A HYDROGENATIVE METAL COMPONENT.
Inventors
- 👤 William B Wilson
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 16:30
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) | 1974-04-19 | 1974-10-19 | 1975-04-20 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-04-19 | 1978-10-19 | 1979-04-20 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-04-19 | 1982-10-19 | 1983-04-20 | $7700.00 | Window Closed / Lapsed |