Patent US2544697A successfully refreshed from Google Patents.
US2544697A
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Blast furnace operation
Assignee: Standard Oil Development Co
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Filing: 1946-12-31
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Granted: 1951-03-13
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Expires: 1966-12-31
Abstract
No abstract record available.
Inventors
- 👤 Warren K Lewis
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 19:50
CPC Classifications
C; C21; C21B; C21B5/00; C21B5/02; C21B5/023; C21B13/00; C21B13/14; Y; Y10; Y10S; Y10S48/00; Y10S48/04
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
100 words
IN THE OPERATION OF A BLAST FURNACE IN WHICH ORE, COKE, AND SLAGGING CONSTITUENTS ARE FED TO THE TOP THEREOF IN THE USUAL MANNER AND IN WHICH A BLAST OF AN OXYGEN-CONTAINING GAS IS FED TO THE TUYERE LEVEL OF SAID FURNACE, THE IMPROVEMENT WHICH COMPRISES REDUCING FINELY-DIVIDED IRON ORE IN THE FORM OF A FLUIDIZED BED IN A REDUCTION ZONE, WITHDRAWING REDUCED ORE FROM SAID ZONE AND CHARGING IT IN THE FORM OF AN ELONGATED FLUIDIZED COLUMN TO SAID BLAST FURNACE AT THE TUYERE LEVEL THEREOF FOR THE PURPOSE OF MELTING AND PURIFYING THE LATTER WITHIN THE BLAST FURNACE.
Claim 2
Dependent Claim
100 words
IN THE OPERATION OF A BLAST FURNACE IN WHICH ORE, COKE, AND SLAGGING CONSTITUENTS ARE FED TO THE TOP THEREOF IN THE USUAL MANNER AND IN WHICH A BLAST OF AN OXYGEN-CONTAINING GAS IS FED TO THE TUYERE LEVEL OF SAID FURNACE, THE IMPROVEMENT WHICH COMPRISES REDUCING FINELY-DIVIDED IRON ORE IN THE FORM OF A FLUIDIZED BED IN A REDUCTION ZONE, WITHDRAWING REDUCED ORE FROM SAID ZONE AND CHARGING IT IN THE FORM OF AN ELONGATED FLUIDIZED COLUMN TO SAID BLAST FURNACE AT THE TUYERE LEVEL THEREOF FOR THE PURPOSE OF MELTING AND PURIFYING THE LATTER WITHIN THE BLAST FURNACE.
References Cited (Backward Citations)
GB190400755A
Cited
US943599A
Cited
US1815899A
Cited
US2057554A
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DE699962C
Cited
US2249410A
Cited
US2343780A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1954-03-12 | 1954-09-11 | 1955-03-13 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1958-03-12 | 1958-09-11 | 1959-03-13 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1962-03-12 | 1962-09-11 | 1963-03-13 | $7700.00 | Window Closed / Lapsed |