US2925394A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Preparation of alumina extrudates
Assignee: Standard Oil Co
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Filing: 1957-01-18
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Granted: 1960-02-16
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Expires: 1977-01-18
Abstract
No abstract record available.
Inventors
- 👤 Harry M Brennan
- 👤 Field Edmund
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 15:38
CPC Classifications
C; C01; C01F; C01F7/00; C01F7/02; C01F7/021; C01F7/025; B; B01; B01J; B01J21/00; B01J21/02; B01J21/04; B01J23/00; B01J23/38
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
75 words
A METHOD FOR PREPARING ALUMINA EXTRUDATES OF HIGH PURITY WHICH COMPRISES KNEADING FINELY-DIVIDED CALCINED ALUMINA CONTAINING BETWEEN ABOUT 1 AND 18 PERCENT BY WEIGHT OF COMBINED WATER WITH BETWEEN ABOUT 0.2 TO 1.1 VOLUMES OF AQUEOUS AMMONIUM HYDROXIDE PER VOLUME OF SAID CALCINED ALUMINA, SAID SOLUTION HAVING A PH IN THE RANGE OF BETWEEN ABOUT 8 TO 12, FOR A PERIOD IN EXCESS OF ABOUT 10 SECONDS, EXTRUDING THE KNEADED ALUMINA, AND THERAFTER DRYING CLACINING.
Claim 2
Independent Claim
75 words
A METHOD FOR PREPARING ALUMINA EXTRUDATES OF HIGH PURITY WHICH COMPRISES KNEADING FINELY-DIVIDED CALCINED ALUMINA CONTAINING BETWEEN ABOUT 1 AND 18 PERCENT BY WEIGHT OF COMBINED WATER WITH BETWEEN ABOUT 0.2 TO 1.1 VOLUMES OF AQUEOUS AMMONIUM HYDROXIDE PER VOLUME OF SAID CALCINED ALUMINA, SAID SOLUTION HAVING A PH IN THE RANGE OF BETWEEN ABOUT 8 TO 12, FOR A PERIOD IN EXCESS OF ABOUT 10 SECONDS, EXTRUDING THE KNEADED ALUMINA, AND THERAFTER DRYING CLACINING.
Claim 3
Independent Claim
132 words
A METHOD FOR PREPARING PLATINUM-ALUMINA CATALYTIC EXTRUDES SUITABLE FOR THE CONVERSION OF HYDROCARBONS COMPRISES CALCINING ALUMINA AT A TEMPERATURE BETWEEN ABOUT 700 AND 1400*F. FOR A PERIOD IN EXCESS OF ABOUT 0.5 HOUR, KNEADING THE CALCINED ALUMINA IN FINLEY-DIVIDED FORM WITH BETWEEN ABOUT 0.7 TO 1.0 VOLUME OF A CONCENTRATED SOLUTION OF AMMONIA IN WATER PER VOLUME OF SAID CALCINED ALUMINA FOR A PERIOD IN EXCESS OF ABOUT 1 MINUTE, EXTRUDING THE KNEADED ALUMINA, CALCINING THE EXTRUDED ALUMINA AT A TEMPERATURE IN THE RANGE OF ABOUT 700 TO 1400*F. FOR A PERIOD IN EXCESS OF 0.5 HOUR, IMPREGNATING THE CALCINED EXTRUDED ALUMINA WITH PLATINUM BY EMPLOYING AN IMPREGNATING SOLUTION CONTAINING A PLATINUM COMPOUND EQUIVALENT TO ABOUT 0.01 TO 1.0 PERCENT BY WEIGHT OF PLATINUM, BASED ON DRY AL2O3, AND DRYING AND CALCINING.
Claim 4
Independent Claim
132 words
A METHOD FOR PREPARING PLATINUM-ALUMINA CATALYTIC EXTRUDES SUITABLE FOR THE CONVERSION OF HYDROCARBONS COMPRISES CALCINING ALUMINA AT A TEMPERATURE BETWEEN ABOUT 700 AND 1400*F. FOR A PERIOD IN EXCESS OF ABOUT 0.5 HOUR, KNEADING THE CALCINED ALUMINA IN FINLEY-DIVIDED FORM WITH BETWEEN ABOUT 0.7 TO 1.0 VOLUME OF A CONCENTRATED SOLUTION OF AMMONIA IN WATER PER VOLUME OF SAID CALCINED ALUMINA FOR A PERIOD IN EXCESS OF ABOUT 1 MINUTE, EXTRUDING THE KNEADED ALUMINA, CALCINING THE EXTRUDED ALUMINA AT A TEMPERATURE IN THE RANGE OF ABOUT 700 TO 1400*F. FOR A PERIOD IN EXCESS OF 0.5 HOUR, IMPREGNATING THE CALCINED EXTRUDED ALUMINA WITH PLATINUM BY EMPLOYING AN IMPREGNATING SOLUTION CONTAINING A PLATINUM COMPOUND EQUIVALENT TO ABOUT 0.01 TO 1.0 PERCENT BY WEIGHT OF PLATINUM, BASED ON DRY AL2O3, AND DRYING AND CALCINING.
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) | 1963-02-15 | 1963-08-17 | 1964-02-16 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1967-02-15 | 1967-08-17 | 1968-02-16 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1971-02-15 | 1971-08-17 | 1972-02-16 | $7700.00 | Window Closed / Lapsed |