US3702238A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Apparatus for by-passing reactants to the interior of a catalyst bed
Assignee: Chevron USA Inc
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Filing: 1970-03-18
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Granted: 1972-11-07
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Expires: 1990-03-18
Abstract
Abstract AN APPARATUS FOR REACTANT BY-PASS OF AN ENCRUSTED LAYER AT THE TOP OF A CATALYST BED. A NORMALLY CLOSED CONDUIT EXTENDS FROM THE UPSTREAM END OF THE BED TO THE INTERIOR OF THE BED NEAR THE TOP THEREOF. A FLOW DIRECTION REVERSAL OCCURS AT THE DISCHARGE OF THE CONDUIT. AN INCREASE IN PRESSURE DROP INDUCES OPENING OF THE CONDUIT WHEREUPON REACTANTS SURGE AGAINST THE UNDERSIDE OF THE CRUST FORMA- TION SO THAT REACTANT FLOW TENDS TO UNWEDGE DEPOSITS FORMING THE CRUST.
Inventors
- 👤 John M Armistead
- 👤 Joseph K Kosiba
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 16:46
CPC Classifications
C; C10; C10G; C10G49/00; C10G49/002; B; B01; B01J; B01J8/00; B01J8/008; B01J8/0085; B01J8/02; B01J8/04; B01J8/0446; B01J8/0449; B01J8/0453
Claims Analysis
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References Cited (Backward Citations)
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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) | 1975-11-07 | 1976-05-08 | 1976-11-07 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-11-07 | 1980-05-08 | 1980-11-07 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-11-07 | 1984-05-08 | 1984-11-07 | $7700.00 | Window Closed / Lapsed |