US3224871A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Process of preheating ores for reduction in smelting furnace
Assignee: Elektrokemisk AS
•
Filing: 1962-02-15
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Granted: 1965-12-21
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Expires: 1982-02-15
Abstract
No abstract record available.
Inventors
- 👤 Collin Frederik Christen
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 12:51
CPC Classifications
C; C21; C21B; C21B13/00; C21B13/14; B; B01; B01J; B01J19/00; B01J19/28; C21B13/08; B01J2219/00; B01J2219/00049; B01J2219/00051; B01J2219/00054; B01J2219/00056; B01J2219/00069; B01J2219/00074; B01J2219/00087; B01J2219/00099; B01J2219/0015; B01J2219/00155; B01J2219/00159; B01J2219/00164; B01J2219/00186; B01J2219/18; B01J2219/187
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
133 words
THE METHOD OF TREATING ORES IN A ROTARY KILN HAVING AT LEAST ONE SHAFT ASSOCIATED THEREWITH FOR FEEDING CHARGE INTO THE KILN WHICH COMPRISES THE STEPS OF INTRODUCING CHARGE INTO THE SHAFT TO ESTABLISH A COLUMN OF CHARGE THEREIN WHICH IS RELATIVELY SHORT WITH RESPECT TO THE LENGTH OF THE KILN, MOVING THE CHARGE IN THE COLUMN DOWNWARDLY IN THE SHAFT, COLLECTING HOT OFF GAS FROM THE ROTARY KILN, INTRODUCING AT LEAST A PORTION OF THE HOT OFF GAS INTO THE LOWER END PORTION OF THE SHAFT, PASSING THE INTRODUCED OFF GAS UPWARDLY IN THE SHAFT IN COUNTERCURRENT FLOW THROUGH THE INTERSTICES IN THE COLUMN OF CHARGE, WITHDRAWING THE INTRODUCED OFF GAS FROM THE UPPER PORTION OF THE SHAFT AND FEEDING THE CHARGE HEATED BY THE INTRODUCED OFF GAS INTO THE ROTARY KILN.
Claim 2
Independent Claim
133 words
THE METHOD OF TREATING ORES IN A ROTARY KILN HAVING AT LEAST ONE SHAFT ASSOCIATED THEREWITH FOR FEEDING CHARGE INTO THE KILN WHICH COMPRISES THE STEPS OF INTRODUCING CHARGE INTO THE SHAFT TO ESTABLISH A COLUMN OF CHARGE THEREIN WHICH IS RELATIVELY SHORT WITH RESPECT TO THE LENGTH OF THE KILN, MOVING THE CHARGE IN THE COLUMN DOWNWARDLY IN THE SHAFT, COLLECTING HOT OFF GAS FROM THE ROTARY KILN, INTRODUCING AT LEAST A PORTION OF THE HOT OFF GAS INTO THE LOWER END PORTION OF THE SHAFT, PASSING THE INTRODUCED OFF GAS UPWARDLY IN THE SHAFT IN COUNTERCURRENT FLOW THROUGH THE INTERSTICES IN THE COLUMN OF CHARGE, WITHDRAWING THE INTRODUCED OFF GAS FROM THE UPPER PORTION OF THE SHAFT AND FEEDING THE CHARGE HEATED BY THE INTRODUCED OFF GAS INTO THE ROTARY KILN.
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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) | 1968-12-20 | 1969-06-21 | 1969-12-21 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1972-12-20 | 1973-06-21 | 1973-12-21 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1976-12-20 | 1977-06-21 | 1977-12-21 | $7700.00 | Window Closed / Lapsed |