US2833699A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Catalyst stripping process
Assignee: Shell Development Co
•
Filing: 1953-08-10
•
Granted: 1958-05-06
•
Expires: 1973-08-10
Abstract
No abstract record available.
Inventors
- 👤 Robert S Dicks
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 20:52
CPC Classifications
B; B01; B01J; B01J8/00; B01J8/0015; B01J8/003; B01J8/18; B01J8/1845; B01J8/1863; B01J8/24; B01J8/26; B01J8/34
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
73 words
IN THE STRIPPING OF A POWDERED HYDROCARBON CONVERSION CATALYST PRIOR TO REGENERATION OF THE CATALYST BY BURNING OFF CARBONACEOUS DEPOSITS AND WHEREIN THE CONTAMINATED CATALYST IS TRANSFERRED IN A PSEUDO LIQUID CONDITION BY GRAVITY FLOW FROM A HYDROCARBON CONVERSION ZONE TO A SEPARATE STRIPPING ZONE, THE IMPROVEMENT WHICH COMPRISES BLASTING THE PSEUDO LIQUID CATALYST ENTERING SAID STRIPPING ZONE WITH A JET OF STEAM TO THOROUGHLY DISPERSE THE CATALYST, IMMEDIATELY SEPARATING THE DISPERSED CATA-
Claim 2
Dependent Claim
73 words
IN THE STRIPPING OF A POWDERED HYDROCARBON CONVERSION CATALYST PRIOR TO REGENERATION OF THE CATALYST BY BURNING OFF CARBONACEOUS DEPOSITS AND WHEREIN THE CONTAMINATED CATALYST IS TRANSFERRED IN A PSEUDO LIQUID CONDITION BY GRAVITY FLOW FROM A HYDROCARBON CONVERSION ZONE TO A SEPARATE STRIPPING ZONE, THE IMPROVEMENT WHICH COMPRISES BLASTING THE PSEUDO LIQUID CATALYST ENTERING SAID STRIPPING ZONE WITH A JET OF STEAM TO THOROUGHLY DISPERSE THE CATALYST, IMMEDIATELY SEPARATING THE DISPERSED CATA-
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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) | 1961-05-05 | 1961-11-04 | 1962-05-06 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1965-05-05 | 1965-11-04 | 1966-05-06 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1969-05-05 | 1969-11-04 | 1970-05-06 | $7700.00 | Window Closed / Lapsed |