Patent US3645771A successfully refreshed from Google Patents.
US2981590A
Expired / Lapsed
US
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Method of controlling temperature in reactivating catalysts
Assignee: Wyeth Holdings LLC
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Filing: 1956-09-18
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Granted: 1961-04-25
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Expires: 1976-09-18
Abstract
No abstract record available.
Inventors
- 👤 Alfred O Parker
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 16:21
CPC Classifications
F; F28; F28C; F28C3/00; F28C3/10; F28C3/12; F28C3/16; B; B01; B01J; B01J21/00; B01J21/20; B01J23/00; B01J23/90; B01J38/00; B01J38/04; B01J38/12; B01J8/00; B01J8/02; B01J8/06; B01J8/067; B01J2208/00; B01J2208/00008; B01J2208/00017; B01J2208/00026; B01J2208/00035; B01J2208/00044; B01J2208/00053; B01J2208/00106; B01J2208/00168; B01J2208/00212; B01J2208/00221; B01J2219/00; B01J2219/18; B01J2219/185
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
143 words
IN REACTIVATING IN SITU A CATALYST WITHIN THE TUBES OF A GAS-COOLED, MULTITUBE, TUBULAR CONVERTER, WHEREBY (A) A HIGHLY EXOTHERMIC REACTION INITIALLY OCCURS WITHIN A LIMITED PORTION OF THE CATALYST NEAR ONE END OF SAID TUBES, (B) SAID REACTION THEN MOVES PROGRESSIVELY ALONG SAID TUBES TO THE OTHER END AND (C) A FLOW OF AVAILABLE COOLING GAS IS MAINTAINED ACROSS SAID TUBES, WHEREBY THE EXOTHERMIC HEAT IS REMOVED WHILE SIMULTANEOUSLY HEATING SAID COOLING GAS, THE IMPROVED METHOD OF BOTH PREVENTING EXCESSIVE TEMPERATURE RISE IN SAID LIMITED CATALYST PORTION AND HEATING A LIMITED FLOW OF COOLING GAS TO A DESIRED EXIT TEMPERATURE ABOVE THAT OBTAINED WHEN SAID COOLING GAS FLOW IS SUFFICIENTLY LARGE TO PREVENT AN EXCESSIVE TEMPERATURE RISE IN SAID LIMITED CATALYST PORTION, SAID METHOD COMPRISING: PASSING SAID LIMITED FLOW OF COOLING GAS ALONG A FLOW PATH IN ALTERNATE DIRECTIONS THROUGH A SUCCESSION
Claim 2
Dependent Claim
143 words
IN REACTIVATING IN SITU A CATALYST WITHIN THE TUBES OF A GAS-COOLED, MULTITUBE, TUBULAR CONVERTER, WHEREBY (A) A HIGHLY EXOTHERMIC REACTION INITIALLY OCCURS WITHIN A LIMITED PORTION OF THE CATALYST NEAR ONE END OF SAID TUBES, (B) SAID REACTION THEN MOVES PROGRESSIVELY ALONG SAID TUBES TO THE OTHER END AND (C) A FLOW OF AVAILABLE COOLING GAS IS MAINTAINED ACROSS SAID TUBES, WHEREBY THE EXOTHERMIC HEAT IS REMOVED WHILE SIMULTANEOUSLY HEATING SAID COOLING GAS, THE IMPROVED METHOD OF BOTH PREVENTING EXCESSIVE TEMPERATURE RISE IN SAID LIMITED CATALYST PORTION AND HEATING A LIMITED FLOW OF COOLING GAS TO A DESIRED EXIT TEMPERATURE ABOVE THAT OBTAINED WHEN SAID COOLING GAS FLOW IS SUFFICIENTLY LARGE TO PREVENT AN EXCESSIVE TEMPERATURE RISE IN SAID LIMITED CATALYST PORTION, SAID METHOD COMPRISING: PASSING SAID LIMITED FLOW OF COOLING GAS ALONG A FLOW PATH IN ALTERNATE DIRECTIONS THROUGH A SUCCESSION
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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) | 1964-04-24 | 1964-10-24 | 1965-04-25 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1968-04-24 | 1968-10-24 | 1969-04-25 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1972-04-24 | 1972-10-24 | 1973-04-25 | $7700.00 | Window Closed / Lapsed |