US2980632A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Alumina of controlled density and catalysts prepared therefrom
Assignee: Wyeth Holdings LLC
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Filing: 1957-05-17
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Granted: 1961-04-18
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Expires: 1977-05-17
Abstract
No abstract record available.
Inventors
- 👤 Thomas J Malley
- 👤 Harvey D Schindler
- 👤 Jr John D Pennell
- 👤 William B Innes
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 11:01
CPC Classifications
B; B01; B01J; B01J13/00; B01J21/00; B01J21/02; B01J21/04; B01J23/00; B01J23/16; B01J23/24; B01J23/70; B01J23/76; B01J23/84; B01J23/85; B01J23/88; B01J23/882; B01J37/00; B01J37/02; B01J37/03; B01J37/036; C; C01; C01F; C01F7/00; C01F7/02; C01F7/34; C01P; C01P2006/00; C01P2006/10; C01P2006/12; C01P2006/14; C01P2006/16
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
59 words
A METHOD OF PRODUCING AN ALUMINA-BASE CATALYST OF CONTROLLED DENSITY WHICH COMPRISES PRECIPITATING HYDRATED ALUMINA FROM AN AQUEOUS SOLUTION OF A WATERSOLUBLE ALUMINUM COMPOUND AT A PH OF FROM 9 TO 10.5, IMPREGNATING SAID HYDRATED ALUMINA WITH AN ACTIVATING METAL COMPOUND, DENSIFYING THE IMPREGNATED ALUMINA BY HOMOGENIZATION AND COVERING IT INTO A DRIED GEL BY THE APPLICATION OF HEAT.
Claim 2
Independent Claim
59 words
A METHOD OF PRODUCING AN ALUMINA-BASE CATALYST OF CONTROLLED DENSITY WHICH COMPRISES PRECIPITATING HYDRATED ALUMINA FROM AN AQUEOUS SOLUTION OF A WATERSOLUBLE ALUMINUM COMPOUND AT A PH OF FROM 9 TO 10.5, IMPREGNATING SAID HYDRATED ALUMINA WITH AN ACTIVATING METAL COMPOUND, DENSIFYING THE IMPREGNATED ALUMINA BY HOMOGENIZATION AND COVERING IT INTO A DRIED GEL BY THE APPLICATION OF HEAT.
References Cited (Backward Citations)
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US2773839A
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US2800429A
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US2768125A
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US2773845A
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1964-04-17 | 1964-10-17 | 1965-04-18 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1968-04-17 | 1968-10-17 | 1969-04-18 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1972-04-17 | 1972-10-17 | 1973-04-18 | $7700.00 | Window Closed / Lapsed |