US3148868A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Reheating furnace
Assignee: United States Steel Corp
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Filing: 1960-03-24
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Granted: 1964-09-15
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Expires: 1980-03-24
Abstract
No abstract record available.
Inventors
- 👤 Clarence W Sidwell
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 10:47
CPC Classifications
C; C21; C21D; C21D9/00; C21D9/0081; F; F27; F27B; F27B9/00; F27B9/14; F27B9/20; F27B9/22
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
166 words
IN A REHEATING FURNACE WHICH HAS A CHARGING END AND A DISCHARGE END, A HEARTH EXTENDING BETWEEN SAID ENDS, WALLS DEFINING AT LEAST TOW COMBUSTION ZONES IN REALTION TO SAID HEARTH, BURNERS IN EACH OF SAID ZONES DIRECTED TOWARD SAID CHARGING END, MEANS AT SAID CHARGING END FOR RECEIVING FLUE GAS, AND AT LEAST ONE RECUPERATOR CONNECTED WITH SAID MEANS FOR UTILIZING SENSIBLE HEAT IN THE FLUE GAS FOR PREHEATING AIR AND ADAPTED TO BECOME PROGRESSIVELY COOLER ALONG ITS LENGTH AS HEAT IS EXTRACTED FROM THE FLUE GAS, THE COMBINATION THEREWITH OF A HEADER SYSTEM FOR INTRODUCING AIR TO SAID BURNERS, SAID SYSTEM COMPRISING A HOT AIR HEADER CONNECTED TO SAID RECUPERATOR TO RECEIVE PREHEATED AIR THEREFROM AT DECREASING TEMPERATURES FROM ONE END TO THE OTHER, MEANS CONNECTING A HIGHER TEMPERATURE REGION OF SAID HEADER TO THE BURNERS IN AT LEAST ONE OF SAID ZONES, AND MEANS CONNECTING A LOWER TEMPERATURE REGION OF SAID HEADER TO THE BURNERS OF AT LEAST ANOTHER ONE OF SAID ZONES.
Claim 2
Dependent Claim
166 words
IN A REHEATING FURNACE WHICH HAS A CHARGING END AND A DISCHARGE END, A HEARTH EXTENDING BETWEEN SAID ENDS, WALLS DEFINING AT LEAST TOW COMBUSTION ZONES IN REALTION TO SAID HEARTH, BURNERS IN EACH OF SAID ZONES DIRECTED TOWARD SAID CHARGING END, MEANS AT SAID CHARGING END FOR RECEIVING FLUE GAS, AND AT LEAST ONE RECUPERATOR CONNECTED WITH SAID MEANS FOR UTILIZING SENSIBLE HEAT IN THE FLUE GAS FOR PREHEATING AIR AND ADAPTED TO BECOME PROGRESSIVELY COOLER ALONG ITS LENGTH AS HEAT IS EXTRACTED FROM THE FLUE GAS, THE COMBINATION THEREWITH OF A HEADER SYSTEM FOR INTRODUCING AIR TO SAID BURNERS, SAID SYSTEM COMPRISING A HOT AIR HEADER CONNECTED TO SAID RECUPERATOR TO RECEIVE PREHEATED AIR THEREFROM AT DECREASING TEMPERATURES FROM ONE END TO THE OTHER, MEANS CONNECTING A HIGHER TEMPERATURE REGION OF SAID HEADER TO THE BURNERS IN AT LEAST ONE OF SAID ZONES, AND MEANS CONNECTING A LOWER TEMPERATURE REGION OF SAID HEADER TO THE BURNERS OF AT LEAST ANOTHER ONE OF SAID ZONES.
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) | 1967-09-15 | 1968-03-16 | 1968-09-15 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1971-09-15 | 1972-03-16 | 1972-09-15 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1975-09-15 | 1976-03-16 | 1976-09-15 | $7700.00 | Window Closed / Lapsed |