US2699388A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method and apparatus for making metallic iron
Assignee: Anaconda Copper Mining Co
•
Filing: 1950-10-20
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Granted: 1955-01-11
•
Expires: 1970-10-20
Abstract
No abstract record available.
Inventors
- 👤 Frederick F Frick
- 👤 Holderreed Francis Louis
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-06 00:35
CPC Classifications
C; C21; C21B; C21B13/00; C21B13/08
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
99 words
THE METHOD OF MAKING METALLIC IRON IN A ROTARY FURNACE WHICH COMPRISES ESTABLISHING IN THE FURNACE A DEEP BED OF A CHARGE COMPRISING A LOOSE MIXTURE OF IRON OXIDE AND SOLID CARBONACEOUS MATERIAL, SAID DEEP BED OF CHARGE EXTENDING THROUGHOUT THE INTERIOR LENGTH OF THE FURNACE AND BEING OF A DEPTH ALONG ITS CENTER LINE AVERAGING AT LEAST ABOUT ONE-QUARTER OF THE INSIDE DIAMETER OF THE FURNACE THROUGHOUT SAID LENGTH, CONTINUOUSLY TUMBLING THE BED OF CHARGE, HEATING THE CHARGE TO A TEMPERATURE OF FROM 1750* TO 1900* F. BY INTRODUCING FUEL AND SUFFICIENT COMBUSTION AIR FOR THE SUBSTANTIALLY COM-
Claim 2
Independent Claim
99 words
THE METHOD OF MAKING METALLIC IRON IN A ROTARY FURNACE WHICH COMPRISES ESTABLISHING IN THE FURNACE A DEEP BED OF A CHARGE COMPRISING A LOOSE MIXTURE OF IRON OXIDE AND SOLID CARBONACEOUS MATERIAL, SAID DEEP BED OF CHARGE EXTENDING THROUGHOUT THE INTERIOR LENGTH OF THE FURNACE AND BEING OF A DEPTH ALONG ITS CENTER LINE AVERAGING AT LEAST ABOUT ONE-QUARTER OF THE INSIDE DIAMETER OF THE FURNACE THROUGHOUT SAID LENGTH, CONTINUOUSLY TUMBLING THE BED OF CHARGE, HEATING THE CHARGE TO A TEMPERATURE OF FROM 1750* TO 1900* F. BY INTRODUCING FUEL AND SUFFICIENT COMBUSTION AIR FOR THE SUBSTANTIALLY COM-
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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) | 1958-01-10 | 1958-07-12 | 1959-01-11 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1962-01-10 | 1962-07-12 | 1963-01-11 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1966-01-10 | 1966-07-12 | 1967-01-11 | $7700.00 | Window Closed / Lapsed |