US3034884A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Reduction roasting of iron ores
Assignee: GEA Group AG
•
Filing: 1959-02-26
•
Granted: 1962-05-15
•
Expires: 1979-02-26
Abstract
No abstract record available.
Inventors
- 👤 Meyer Kurt
- 👤 Rausch Hans
- 👤 Koch Walter
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 10:39
CPC Classifications
C; C22; C22B; C22B1/00; C22B1/02; C21; C21B; C21B13/00; C21B13/08; C22B1/14; Y; Y02; Y02P; Y02P10/00; Y02P10/20
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
102 words
A PROCESS FOR REDUCING IRON ORES COMPRISING CHARGING COARSE HEMATITE PARTICLES INTO THE INLET END OF A ROTARY FURNACE, ROASTING SAID ORE TO MAGNETITE IN THE PRESENCE OF A REDUCING GAS, DISCHARGING THE MAGNETITE FROM THE OUTLET END OF THE FURNACE, AND INTRODUCING FINE PARTICLES OF HEMATITE HAVING A SIZE NOT GREATER THAN 1 MM. INTO SAID FURNACE ADJACENT SAID OUTLET END AT A POSITION WHERE THE FINE PARTICLES ARE BROUGHT TO A TEMPERATURE AT WHICH THEY ARE REDUCED TO MAGNETITE BY HEAT PROVIDED BY THE REDUCED TO MAGNETITE COARSE PARTICLES WHILE SIMULTANEOUSLY THE REDUCED COARSE PARTICLES ARE COOLED BELOW RE-OXIDATION TEMPERATURE.
Claim 2
Dependent Claim
102 words
A PROCESS FOR REDUCING IRON ORES COMPRISING CHARGING COARSE HEMATITE PARTICLES INTO THE INLET END OF A ROTARY FURNACE, ROASTING SAID ORE TO MAGNETITE IN THE PRESENCE OF A REDUCING GAS, DISCHARGING THE MAGNETITE FROM THE OUTLET END OF THE FURNACE, AND INTRODUCING FINE PARTICLES OF HEMATITE HAVING A SIZE NOT GREATER THAN 1 MM. INTO SAID FURNACE ADJACENT SAID OUTLET END AT A POSITION WHERE THE FINE PARTICLES ARE BROUGHT TO A TEMPERATURE AT WHICH THEY ARE REDUCED TO MAGNETITE BY HEAT PROVIDED BY THE REDUCED TO MAGNETITE COARSE PARTICLES WHILE SIMULTANEOUSLY THE REDUCED COARSE PARTICLES ARE COOLED BELOW RE-OXIDATION TEMPERATURE.
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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) | 1965-05-14 | 1965-11-13 | 1966-05-15 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1969-05-14 | 1969-11-13 | 1970-05-15 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1973-05-14 | 1973-11-13 | 1974-05-15 | $7700.00 | Window Closed / Lapsed |