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Patent US2631968A successfully refreshed from Google Patents.
US2631968A
Expired / Lapsed
US
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Sheetsxsheet i
Assignee: —
•
Filing: —
•
Granted: 1953-03-17
•
Expires: 1970-03-17
Abstract
No abstract record available.
Inventors
No inventors recorded.
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 10:23
CPC Classifications
B; B01; B01J; B01J8/00; B01J8/005; B01J21/00; B01J21/20; B03; B03B; B03B1/00; B03B5/00; B03B5/28; B03B5/30
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
107 words
IN THE APPLICATION OF A FINELY DIVIDED MICROPOROUS SILICA-ALUMINA CRACKING CATALYST WHICH DECLINES IN ACTIVITY IN USE, THE METHOD OF MAINTAINING A HIGH CATALYTIC ACTIVITY WHICH COMPRISES DISPERSING AT LEAST A PORTION OF THE USED CATALYST IN A LIQUID HAVING A DENSITY INTERMEDIATE BETWEEN THE APPARENT DENSITY OF THE MOST DENSE AND LEAST DENSE PARTICLES OF SAID CATALYST, SEPARATING THE FRACTION OF FLOATED CATALYST PARTICLES FROM THE LIQUID AND RETURNING IT TO USE, SEPARATING THE FRACTION OF CATALYST PARTICLES OF HIGHER APPARENT DENSITY FROM THE LIQUID AND DISCARDING IT, AND SUBSTITUTING FOR THE DISCARDED FRACTION OF PARTICLES OF HIGHER APPARENT DENSITY AN EQUAL QUANTITY OF FRESH CATALYST.
Claim 2
Dependent Claim
107 words
IN THE APPLICATION OF A FINELY DIVIDED MICROPOROUS SILICA-ALUMINA CRACKING CATALYST WHICH DECLINES IN ACTIVITY IN USE, THE METHOD OF MAINTAINING A HIGH CATALYTIC ACTIVITY WHICH COMPRISES DISPERSING AT LEAST A PORTION OF THE USED CATALYST IN A LIQUID HAVING A DENSITY INTERMEDIATE BETWEEN THE APPARENT DENSITY OF THE MOST DENSE AND LEAST DENSE PARTICLES OF SAID CATALYST, SEPARATING THE FRACTION OF FLOATED CATALYST PARTICLES FROM THE LIQUID AND RETURNING IT TO USE, SEPARATING THE FRACTION OF CATALYST PARTICLES OF HIGHER APPARENT DENSITY FROM THE LIQUID AND DISCARDING IT, AND SUBSTITUTING FOR THE DISCARDED FRACTION OF PARTICLES OF HIGHER APPARENT DENSITY AN EQUAL QUANTITY OF FRESH CATALYST.
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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) | 1956-03-16 | 1956-09-15 | 1957-03-17 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1960-03-16 | 1960-09-15 | 1961-03-17 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1964-03-16 | 1964-09-15 | 1965-03-17 | $7700.00 | Window Closed / Lapsed |