US2909424A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method and device for transferring fluidized solids
Assignee: United States Steel Corp
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Filing: 1957-06-04
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Granted: 1959-10-20
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Expires: 1977-06-04
Abstract
No abstract record available.
Inventors
- 👤 Walfred W Jukkola
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 19:00
CPC Classifications
B; B01; B01J; B01J8/00; B01J8/18; B01J8/24; B01J8/26
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
135 words
IN A DIRECT REDUCTION PROCESS FOR IRON ORE WHEREIN DIFFERENT FLUIDIZING GASES ACT ON BEDS OF ORE FINES SUCCESSIVELY IN A PREHEATING CHAMBER AND A REDUCNG CHAMBER, A METHOD OF CONTINUOUSLY TRANSFERRING ORE FINES FROM SAID PREHEATING CHAMBER TO SAID REDUCING CHAMBER COMPRISING DISCHARGING FINES FROM SAID PREHEARING CHAMBER TO THE TOP OF A DOWNWARDLY FLOWING COLUMN, DISCHARGING FINES FROM THE BOTTOM OF AN DOWNWARDLY FLOWING COLUMN TO THE BOTTOM OF AN UPWARDLY FLOWING COLUMN DISCHARGING FINES FROM THE TOP OF SAID UPWARDLY FLOWING COLUMN TO SAID REDUCING CHAMBER, AND INTRODUCING TO THE BOTTOMS OF BOTH SAID COLUMNS A FLUILDIZING GAS DISTINCT FROM THE FLUIDIZING GAS IN EITHER OF SAID CHAMBERS BUT COMPATIBLE WITH THE GASES IN BOTH CHAMBER, THE FLUIDIZED SOLIDS IN SAID COLUMNS PREVENTING INTERMIXING OF GASES FROM THE PREHEATING AND REDUCING CHAMBERS.
Claim 2
Dependent Claim
135 words
IN A DIRECT REDUCTION PROCESS FOR IRON ORE WHEREIN DIFFERENT FLUIDIZING GASES ACT ON BEDS OF ORE FINES SUCCESSIVELY IN A PREHEATING CHAMBER AND A REDUCNG CHAMBER, A METHOD OF CONTINUOUSLY TRANSFERRING ORE FINES FROM SAID PREHEATING CHAMBER TO SAID REDUCING CHAMBER COMPRISING DISCHARGING FINES FROM SAID PREHEARING CHAMBER TO THE TOP OF A DOWNWARDLY FLOWING COLUMN, DISCHARGING FINES FROM THE BOTTOM OF AN DOWNWARDLY FLOWING COLUMN TO THE BOTTOM OF AN UPWARDLY FLOWING COLUMN DISCHARGING FINES FROM THE TOP OF SAID UPWARDLY FLOWING COLUMN TO SAID REDUCING CHAMBER, AND INTRODUCING TO THE BOTTOMS OF BOTH SAID COLUMNS A FLUILDIZING GAS DISTINCT FROM THE FLUIDIZING GAS IN EITHER OF SAID CHAMBERS BUT COMPATIBLE WITH THE GASES IN BOTH CHAMBER, THE FLUIDIZED SOLIDS IN SAID COLUMNS PREVENTING INTERMIXING OF GASES FROM THE PREHEATING AND REDUCING CHAMBERS.
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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) | 1962-10-19 | 1963-04-20 | 1963-10-20 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1966-10-19 | 1967-04-20 | 1967-10-20 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1970-10-19 | 1971-04-20 | 1971-10-20 | $7700.00 | Window Closed / Lapsed |