US2826487A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method of sintering ore fines
Assignee: United States Steel Corp
•
Filing: 1955-07-07
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Granted: 1958-03-11
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Expires: 1975-07-07
Abstract
No abstract record available.
Inventors
- 👤 Jr William L Davis
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 20:40
CPC Classifications
C; C22; C22B; C22B1/00; C22B1/14; C22B1/16; C21; C21B; C21B13/00; C21B13/0086; C21B13/0093; Y; Y02; Y02P; Y02P10/00; Y02P10/10; Y02P10/134
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
91 words
A METHOD OF SINTERING IRON ORE FINES CONSISTING PREDOMINANTLY OF FE2O3 AND FE3O4, WHICH METHOD COMPRISES TREATING THE ORE IN A FLUIDIZED BED AT A TEMPERATURE OF 1100 TO 1400*F. WITH AN ASCENDING CURRENT OF REDUCING GAS TO REDUCE THE ORE TO A UNIFORM PRODUCT CONSISTING ESSENTIALLY OF FEO, THE REDUCING CONSTITUENTS OF SAID GAS BEING SELECTED FROM THE GROUP WHICH CONSISTS OF CARBON MONOXIDE, HYDROGEN AND MIXTURES THEREOF, THE RATIOS OF CO2/CO AND H2O/H2 IN SAID GAS BEING ABOVE THE MAXIMA CAPABLE OF REDUCING FEO TO METALLIC IRON BUT WITHIN
Claim 2
Independent Claim
91 words
A METHOD OF SINTERING IRON ORE FINES CONSISTING PREDOMINANTLY OF FE2O3 AND FE3O4, WHICH METHOD COMPRISES TREATING THE ORE IN A FLUIDIZED BED AT A TEMPERATURE OF 1100 TO 1400*F. WITH AN ASCENDING CURRENT OF REDUCING GAS TO REDUCE THE ORE TO A UNIFORM PRODUCT CONSISTING ESSENTIALLY OF FEO, THE REDUCING CONSTITUENTS OF SAID GAS BEING SELECTED FROM THE GROUP WHICH CONSISTS OF CARBON MONOXIDE, HYDROGEN AND MIXTURES THEREOF, THE RATIOS OF CO2/CO AND H2O/H2 IN SAID GAS BEING ABOVE THE MAXIMA CAPABLE OF REDUCING FEO TO METALLIC IRON BUT WITHIN
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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) | 1961-03-10 | 1961-09-09 | 1962-03-11 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1965-03-10 | 1965-09-09 | 1966-03-11 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1969-03-10 | 1969-09-09 | 1970-03-11 | $7700.00 | Window Closed / Lapsed |