Patent US2575258A successfully refreshed from Google Patents.
US2575258A
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Regenerating an iron-contaminated cracking catalyst
Assignee: Standard Oil Development Co
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Filing: 1948-12-06
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Granted: 1951-11-13
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Expires: 1968-12-06
Abstract
No abstract record available.
Inventors
- 👤 Hampton G Corneil
- 👤 James C Schiller
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 20:13
CPC Classifications
B; B01; B01J; B01J21/00; B01J21/20; Y; Y10; Y10S; Y10S502/00; Y10S502/521
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
105 words
A METHOD FOR TREATING A SILICA-ALUMINA CATALYST EMPLOYED FOR THE CONVERSION OF HYDROCARBONS IN A CATALYST CRACKING OPERATION WHEREIN THE CATALYST IS SUBJECTED TO CONTACT WITH HYDROCARBONS UNDER CONVERSION CONDITIONS AND TO CONTACT WITH A COMBUSTION SUPPORTING GAS UNDER REGENERATION CONDITIONS, SAID CATALYST BEING CONTAMINATED WITH FE2O3 IN AN AMOUNT NO GREATER THAN ABOUT 0.5% BY WEIGHT, WHICH INCULDES THE STEPS OF SUBJECTING AT LEAST PORTION OF THE REGENERATED CATALYST TO THE ACTION OF A REDUCING GAS IN AN AMOUNT AND UNDER CONDITIONS SUFFICIENTLY SEVERE TO CONVERT SAID FE2O3 TO FE3O4 ALTHOUGH NOT SUFFICIENTLY SEVERE TO REDUCE ANY SUBSTANTIAL AMOUNT OF FE2O3 TO METALLIC FE.
Claim 2
Independent Claim
105 words
A METHOD FOR TREATING A SILICA-ALUMINA CATALYST EMPLOYED FOR THE CONVERSION OF HYDROCARBONS IN A CATALYST CRACKING OPERATION WHEREIN THE CATALYST IS SUBJECTED TO CONTACT WITH HYDROCARBONS UNDER CONVERSION CONDITIONS AND TO CONTACT WITH A COMBUSTION SUPPORTING GAS UNDER REGENERATION CONDITIONS, SAID CATALYST BEING CONTAMINATED WITH FE2O3 IN AN AMOUNT NO GREATER THAN ABOUT 0.5% BY WEIGHT, WHICH INCULDES THE STEPS OF SUBJECTING AT LEAST PORTION OF THE REGENERATED CATALYST TO THE ACTION OF A REDUCING GAS IN AN AMOUNT AND UNDER CONDITIONS SUFFICIENTLY SEVERE TO CONVERT SAID FE2O3 TO FE3O4 ALTHOUGH NOT SUFFICIENTLY SEVERE TO REDUCE ANY SUBSTANTIAL AMOUNT OF FE2O3 TO METALLIC FE.
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) | 1954-11-12 | 1955-05-14 | 1955-11-13 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1958-11-12 | 1959-05-14 | 1959-11-13 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1962-11-12 | 1963-05-14 | 1963-11-13 | $7700.00 | Window Closed / Lapsed |