US2535948A
Expired / Lapsed
US
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Incorporation of fines in a silicaalumina catalyst
Assignee: Davison Chemical Corp
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Filing: 1949-03-25
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Granted: 1950-12-26
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Expires: 1969-03-25
Abstract
No abstract record available.
Inventors
- 👤 Finley C Nicholson
- 👤 Wilson Charles Patton
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 00:02
CPC Classifications
B; B01; B01J; B01J21/00; B01J21/12; C; C09; C09C; C09C1/00; C09C1/40; C01; C01P; C01P2004/00; C01P2004/51; C01P2004/60; C01P2004/61; C01P2004/80; C01P2004/82
Claims Analysis
Total Claims: 1
Claim 1
Independent Claim
72 words
IN A METHOD OF MANUFACTURING A SILICA-ALUMINA CATALYST FOR FLUID CATALYTIC PROCESSES IN WHICH A SLURRY OF PRECIPITATED SILICA-ALUMINA GEL IS DRIED, CLASSIFIED, WASHED AND GROUND TO A PARTICLE SIZE OF ABOUT 20-80 MICRONS, THE IMPROVEMENT COMPRISING CLASSIFYING THE GEL INTO AN OVERSIZED PRODUCT FOR GRINDING AND FINES IN AN AMOUNT EQUIVALENT TO ABOUT 30 TO 60% OF THE FRESH SILICAALUMINA GEL, AND RECYCLING THE FINES TO THE SLURRY OF PRECIPITATED GEL.
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) | 1953-12-25 | 1954-06-26 | 1954-12-26 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1957-12-25 | 1958-06-26 | 1958-12-26 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1961-12-25 | 1962-06-26 | 1962-12-26 | $7700.00 | Window Closed / Lapsed |