Patent US2991255A successfully refreshed from Google Patents.
US2991255A
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Extrusion of chromia alumina catalysts
Assignee: Wyeth Holdings LLC
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Filing: 1957-10-03
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Granted: 1961-07-04
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Expires: 1977-10-03
Abstract
No abstract record available.
Inventors
- 👤 Thomas J Malley
- 👤 Harvey D Schindler
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 10:25
CPC Classifications
B; B01; B01J; B01J23/00; B01J23/16; B01J23/24; B01J23/26
Claims Analysis
Total Claims: 3
Claim 1
Independent Claim
123 words
A PROCESS FOR PREPARING AN EXTRUDED ALUMINA BASE CHROMIUM OXIDE CATALYST WHICH IN ITS PREPARED STATE HAS GOOD ACTIVITY, STRENGTH AND APPEARANCE WHICH COMPRISES FILTERING A SLURRY OF AN ALUMINA BASE CHROMIUM OXIDE CATALYST MATERIAL TO PRODUCE AN ALUMINA BASE CHROMIUM OXIDE CATALYST FILTER CAKE, REDUCING THE VOLATILE CONTENT OF SAID ALUMINA BASE CHROMIUM OXIDE CATALYST FILTER CAKE UNTIL A SOLIDS CONTENT OF BETWEEN ABOUT 80 AND ABOUT 90% IS OBTAINED, MULLING SAID ALUMINA BASE MATERIAL WITH A PLASTICIZER AND AN EXTRUSION LUBRICANT TO A SOLIDS CONTENT OF BETWEEN 45 AND 60%, SAID PLASTICIZER BEING SELECTED FROM THE GROUP CONSISTING OF WATER AND A SLURRY OF AN ALUMINA BASE CHROMIUM OXIDE CATALYST MATERIAL, EXTRUDING SAID CATALYST MIXTURE AND DRYING AND CALCINING THE EXTRUDATE.
Claim 2
Dependent Claim
123 words
A PROCESS FOR PREPARING AN EXTRUDED ALUMINA BASE CHROMIUM OXIDE CATALYST WHICH IN ITS PREPARED STATE HAS GOOD ACTIVITY, STRENGTH AND APPEARANCE WHICH COMPRISES FILTERING A SLURRY OF AN ALUMINA BASE CHROMIUM OXIDE CATALYST MATERIAL TO PRODUCE AN ALUMINA BASE CHROMIUM OXIDE CATALYST FILTER CAKE, REDUCING THE VOLATILE CONTENT OF SAID ALUMINA BASE CHROMIUM OXIDE CATALYST FILTER CAKE UNTIL A SOLIDS CONTENT OF BETWEEN ABOUT 80 AND ABOUT 90% IS OBTAINED, MULLING SAID ALUMINA BASE MATERIAL WITH A PLASTICIZER AND AN EXTRUSION LUBRICANT TO A SOLIDS CONTENT OF BETWEEN 45 AND 60%, SAID PLASTICIZER BEING SELECTED FROM THE GROUP CONSISTING OF WATER AND A SLURRY OF AN ALUMINA BASE CHROMIUM OXIDE CATALYST MATERIAL, EXTRUDING SAID CATALYST MIXTURE AND DRYING AND CALCINING THE EXTRUDATE.
Claim 3
Dependent Claim
28 words
A PROCESS FOR PREPARING AN EXTRUDED ALUMINA BASE CHROMIUM OXIDE CATALYST AS IN CLAIM 1 WHERE, IN ADDITION TO CHROMIUM OXIDE, THE CATALYST CONTAINS SILICA AND POTASSIUM OXIDE.
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) | 1964-07-03 | 1965-01-02 | 1965-07-04 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1968-07-03 | 1969-01-02 | 1969-07-04 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1972-07-03 | 1973-01-02 | 1973-07-04 | $7700.00 | Window Closed / Lapsed |