US2540689A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Coprecipitated alumina magnesia silica catalysts
Assignee: BASF Schweiz AG
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Filing: 1948-04-06
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Granted: 1951-02-06
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Expires: 1968-04-06
Abstract
No abstract record available.
Inventors
- 👤 Porret Daniel
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 14:22
CPC Classifications
B; B01; B01J; B01J21/00; B01J21/14; C; C07; C07C; C07C5/00; C07C5/22; C07C5/27; C07C5/29; Y; Y10; Y10S; Y10S585/00; Y10S585/929; Y10S585/947
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
89 words
PROCESS FOR THE MANUFACTURE OF A CATALYST, ESPECIALLY SUITABLE FOR ISOMERIZATIONS, WHICH COMPRISES ADDING AN AQUEOUS SOLUTION OF AN ALUMINUM SALT AND A MAGNESIUM SALT TO AN AQUEOUS SOLUTION OF AN ALKALI METASILICATE CONTAINING A QUANTITY OF ALKALI SUFFICIENT TO PRECIPITATE THE EXCESS ALUMINUM SALT AND EXCESS MAGNESIUM SALT, AND TREATING THE RESULTANT PRECIPITATIONS WIITH WATER AND WITH THE ADDITION OF A HYDROXIDE OF AN ALKALINE EARTH METAL AT AN ELEVATED TEMPERATURE, THE RATIO OF EQUIVALENCE OF METASILICATE TO THE ALUMINUM SALT AND MAGNESIUM SALT BEING 1:1.4 TO 1:10.
Claim 2
Dependent Claim
89 words
PROCESS FOR THE MANUFACTURE OF A CATALYST, ESPECIALLY SUITABLE FOR ISOMERIZATIONS, WHICH COMPRISES ADDING AN AQUEOUS SOLUTION OF AN ALUMINUM SALT AND A MAGNESIUM SALT TO AN AQUEOUS SOLUTION OF AN ALKALI METASILICATE CONTAINING A QUANTITY OF ALKALI SUFFICIENT TO PRECIPITATE THE EXCESS ALUMINUM SALT AND EXCESS MAGNESIUM SALT, AND TREATING THE RESULTANT PRECIPITATIONS WIITH WATER AND WITH THE ADDITION OF A HYDROXIDE OF AN ALKALINE EARTH METAL AT AN ELEVATED TEMPERATURE, THE RATIO OF EQUIVALENCE OF METASILICATE TO THE ALUMINUM SALT AND MAGNESIUM SALT BEING 1:1.4 TO 1:10.
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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) | 1954-02-05 | 1954-08-07 | 1955-02-06 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1958-02-05 | 1958-08-07 | 1959-02-06 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1962-02-05 | 1962-08-07 | 1963-02-06 | $7700.00 | Window Closed / Lapsed |