Patent US2668798A successfully refreshed from Google Patents.
US2668798A
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Cracking catalyst reactivation
Assignee: ExxonMobil Oil Corp
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Filing: 1951-12-28
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Granted: 1954-02-09
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Expires: 1971-12-28
Abstract
No abstract record available.
Inventors
- 👤 Charles J Plank
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 10:37
CPC Classifications
B; B01; B01J; B01J21/00; B01J21/20; Y; Y10; Y10S; Y10S502/00; Y10S502/515; Y10S502/516
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
96 words
A METHOD FOR REACTIVATING A SILICEOUS CRACKING CATALYST WHICH HAS BEEN POISONED BY A SMALL CONTAMINATING AMOUNT, LESS THAN ABOUT 0.20 PERCENT BY WEIGHT, OF NICKEL DURING THE CONVERSION OF HIGH BOILING PETROLEUM HYDROCARBONS TO HYDROCARBONS BOILING IN THE GASOLINE RANGE, WHICH COMPRISES CONTACTING SAID POISONED CATALYST WITH A DILUTE MINERAL ACID SOLUTION, REMOVING THE CATALYST FROM CONTACT WITH SAID SOLUTION, WASHING EXCESS ACID THEREFROM AND SUBJECTING THE CATALYST TO STEAM TREATMENT AT A TEMPERATURE IN THE RANGE OF ABOUT 1000 TO ABOUT 1300* F. FOR A PERIOD OF BETWEEN ABOUT 2 AND ABOUT 48 HOURS.
Claim 2
Independent Claim
96 words
A METHOD FOR REACTIVATING A SILICEOUS CRACKING CATALYST WHICH HAS BEEN POISONED BY A SMALL CONTAMINATING AMOUNT, LESS THAN ABOUT 0.20 PERCENT BY WEIGHT, OF NICKEL DURING THE CONVERSION OF HIGH BOILING PETROLEUM HYDROCARBONS TO HYDROCARBONS BOILING IN THE GASOLINE RANGE, WHICH COMPRISES CONTACTING SAID POISONED CATALYST WITH A DILUTE MINERAL ACID SOLUTION, REMOVING THE CATALYST FROM CONTACT WITH SAID SOLUTION, WASHING EXCESS ACID THEREFROM AND SUBJECTING THE CATALYST TO STEAM TREATMENT AT A TEMPERATURE IN THE RANGE OF ABOUT 1000 TO ABOUT 1300* F. FOR A PERIOD OF BETWEEN ABOUT 2 AND ABOUT 48 HOURS.
References Cited (Backward Citations)
US2380731A
Cited
US2375757A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1957-02-08 | 1957-08-10 | 1958-02-09 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1961-02-08 | 1961-08-10 | 1962-02-09 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1965-02-08 | 1965-08-10 | 1966-02-09 | $7700.00 | Window Closed / Lapsed |