Patent US2689176A successfully refreshed from Google Patents.
US2689176A
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US
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Method for roasting ores
Assignee: Combined Metals Reduction Co
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Filing: 1950-10-31
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Granted: 1954-09-14
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Expires: 1970-10-31
Abstract
No abstract record available.
Inventors
- 👤 Klepetko Ernest
- 👤 Philip De B Kaye
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 17:32
CPC Classifications
F; F27; F27B; F27B3/00; F27B3/10; F27B3/22; C; C22; C22B; C22B1/00; C22B1/02; F27B9/00; F27B9/14; F27B9/16; F27B9/18; F27B9/185; F27B9/20; F27B9/24
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
66 words
IN THE ROASTING OF ORES AND CONCENTRATES, THE IMPROVEMENT WHICH COMPRISES CAUSING A STREAM OF SUCH MATERIAL IN FINELY DIVIDED FORM AND HEATED TO ITS ROASTING TEMPERATURE TO FALL OVER THE EDGE OF A HEARTH AND THROUGH A DROP HOLE, AND INITIALLY CONTACTING A FRESH STREAM OF LATERALLY-DIRECTED AIR WITH THE FALLING STREAM OF CHARGE SUBSTANTIALLY IMMEDIATELY AS IT PASSES OVER THE EDGE OF THE HEARTH.
Claim 2
Dependent Claim
66 words
IN THE ROASTING OF ORES AND CONCENTRATES, THE IMPROVEMENT WHICH COMPRISES CAUSING A STREAM OF SUCH MATERIAL IN FINELY DIVIDED FORM AND HEATED TO ITS ROASTING TEMPERATURE TO FALL OVER THE EDGE OF A HEARTH AND THROUGH A DROP HOLE, AND INITIALLY CONTACTING A FRESH STREAM OF LATERALLY-DIRECTED AIR WITH THE FALLING STREAM OF CHARGE SUBSTANTIALLY IMMEDIATELY AS IT PASSES OVER THE EDGE OF THE HEARTH.
References Cited (Backward Citations)
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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) | 1957-09-13 | 1958-03-15 | 1958-09-14 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1961-09-13 | 1962-03-15 | 1962-09-14 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1965-09-13 | 1966-03-15 | 1966-09-14 | $7700.00 | Window Closed / Lapsed |