US2919973A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method of preparing catalytically active alumina
Assignee: Individual
•
Filing: 1956-10-18
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Granted: 1960-01-05
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Expires: 1976-10-18
Abstract
No abstract record available.
Inventors
- 👤 William D Stillwell
- 👤 Bakker Lubertus
- 👤 Jack R Lytle
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 11:39
CPC Classifications
B; B01; B01J; B01J21/00; B01J21/02; B01J21/04
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
117 words
THE METHOD OF PRODUCING CATALYTICALLY ACTIVE ALUMINA WHEREIN SUBSTANTIALLY ALL OF THE ALUMINA PRIOR TO CALCINATION OPERATIONS IS PRESENT IN ITS TRIHYDRATE FROM COMPRISING REACTING SODIUM ALUMINATE WITH HYDROCHLORIC ACID IN AN AGITATED AQUEOUS SOLUTION UNDER ACIDIC CONDITIONS TO PRODUCE A GELATINOUS MASS OF ALUMINA HYDROXIDE CONTAINING SODIUM CHLORIDE, ADJUSTING THE PH OF THE GELATINOUS MASS TO AN ALKALINE PH BETWEEN 7.2 AND 9.5 BY ADDING A BASIC COMPONENT TO SAID GELATINOUS MASS, DRYING SAID ALKALINE GELATINOUS MASS OF ALUMINA HYDROXIDE CONTAINING SODIUM CHLORIDE TO A VITREOUS MASS OF AL2O3.3H2O CONTAINING SODIUM CHLORIDE AND SUBSTANTIALLY FREE OF UNCOMBINED WATER, THEREAFTER WASHING SAID SODIUM CHLORIDE FROM SAID DRIED MASS AND ACTIVATING THE WASHED ALUMINA HYDROXIDE MASS BY CALCINATION.
Claim 2
Independent Claim
117 words
THE METHOD OF PRODUCING CATALYTICALLY ACTIVE ALUMINA WHEREIN SUBSTANTIALLY ALL OF THE ALUMINA PRIOR TO CALCINATION OPERATIONS IS PRESENT IN ITS TRIHYDRATE FROM COMPRISING REACTING SODIUM ALUMINATE WITH HYDROCHLORIC ACID IN AN AGITATED AQUEOUS SOLUTION UNDER ACIDIC CONDITIONS TO PRODUCE A GELATINOUS MASS OF ALUMINA HYDROXIDE CONTAINING SODIUM CHLORIDE, ADJUSTING THE PH OF THE GELATINOUS MASS TO AN ALKALINE PH BETWEEN 7.2 AND 9.5 BY ADDING A BASIC COMPONENT TO SAID GELATINOUS MASS, DRYING SAID ALKALINE GELATINOUS MASS OF ALUMINA HYDROXIDE CONTAINING SODIUM CHLORIDE TO A VITREOUS MASS OF AL2O3.3H2O CONTAINING SODIUM CHLORIDE AND SUBSTANTIALLY FREE OF UNCOMBINED WATER, THEREAFTER WASHING SAID SODIUM CHLORIDE FROM SAID DRIED MASS AND ACTIVATING THE WASHED ALUMINA HYDROXIDE MASS BY CALCINATION.
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) | 1963-01-04 | 1963-07-06 | 1964-01-05 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1967-01-04 | 1967-07-06 | 1968-01-05 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1971-01-04 | 1971-07-06 | 1972-01-05 | $7700.00 | Window Closed / Lapsed |