US2689176A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method for roasting ores
Assignee: Combined Metals Reduction Co
•
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 17:20
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)
US522421A
Cited
US677263A
Cited
US799696A
Cited
US879842A
Cited
US1671395A
Cited
US2421542A
Cited
US2558963A
Cited
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 |