Patent US3579123A successfully refreshed from Google Patents.
Patent US2769688A successfully refreshed from Google Patents.
US2769688A
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Low sodium catalyst support
Assignee: Houdry Process Corp
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Filing: 1952-02-26
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Granted: 1956-11-06
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Expires: 1972-02-26
Abstract
No abstract record available.
Inventors
- 👤 Jr Thomas H Milliken
- 👤 David W Koester
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 14:26
CPC Classifications
B; B01; B01J; B01J23/00; B01J23/38; B01J23/40; B01J23/42; B01J21/00; B01J21/16; B01J21/02; B01J21/04
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
75 words
THE METHOD OF PRODUCING REFINED ACTIVATED ALUMINA OF RELATIVELY LOW SODIUM CONTENT FOR CATALYTIC PURPOSES WHICH COMPRISES CALCINING ALUMINUM TRIHYDRATE AT A TEMPERATURE IN THE RANGE OF ABOUT 800 TO 1050E F., LEACHING THE CALCINED ALUMINA WITH A DILUTE SOLUTION OF A MILD ACIDIC AGENT VAPORIZABLE AT MODERATE TEMPERATURES, SEPARATING THE ACID SOLUTION FROM THE LEACHED ALUMINA, DRYING AND HEAT-TREATING THE DRIED ALUMINA AT A TEMPERATURE IN THE RANGE OF ABOUT 900 TO 1400* F.
Claim 2
Independent Claim
75 words
THE METHOD OF PRODUCING REFINED ACTIVATED ALUMINA OF RELATIVELY LOW SODIUM CONTENT FOR CATALYTIC PURPOSES WHICH COMPRISES CALCINING ALUMINUM TRIHYDRATE AT A TEMPERATURE IN THE RANGE OF ABOUT 800 TO 1050E F., LEACHING THE CALCINED ALUMINA WITH A DILUTE SOLUTION OF A MILD ACIDIC AGENT VAPORIZABLE AT MODERATE TEMPERATURES, SEPARATING THE ACID SOLUTION FROM THE LEACHED ALUMINA, DRYING AND HEAT-TREATING THE DRIED ALUMINA AT A TEMPERATURE IN THE RANGE OF ABOUT 900 TO 1400* F.
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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) | 1959-11-06 | 1960-05-07 | 1960-11-06 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1963-11-06 | 1964-05-07 | 1964-11-06 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1967-11-06 | 1968-05-07 | 1968-11-06 | $7700.00 | Window Closed / Lapsed |