US2557650A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Metallurgical process
Assignee: Standard Oil Development Co
•
Filing: 1948-07-30
•
Granted: 1951-06-19
•
Expires: 1968-07-30
Abstract
No abstract record available.
Inventors
- 👤 Edwin R Gilliland
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 23:24
CPC Classifications
C; C21; C21B; C21B13/00; C21B13/10; Y; Y02; Y02P; Y02P10/00; Y02P10/10; Y02P10/134
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
76 words
A METHOD FOR REDUCING OXIDIC ORES OF METALS HIGHLY REACTIVE WITH OXIDIZING GASES AT ELEVATED TEMPERATURE, WHICH COMPRISES ESTABLISHING A LAYER OF SAID METAL IN MOLTEN FORM COVERED BY A LAYER OF MOLTEN SLAG, CONTINUOUSLY WITHDRAWING SLAG FROM SAID SLAG LAYER, HEATING SAID WITHDRAWN SLAG BY CONTACT WITH COMBUSTION GAS CONTAINING OXIDIZING CONSTITUENTS IN A SEPARATE ZONE, RETURNING THE HEATED SLAG TO THE MOLTEN SLAG LAYER, SO AS TO FURNISH THE HEAT SUPPLY REQUIRED FOR REDUCING
Claim 2
Independent Claim
76 words
A METHOD FOR REDUCING OXIDIC ORES OF METALS HIGHLY REACTIVE WITH OXIDIZING GASES AT ELEVATED TEMPERATURE, WHICH COMPRISES ESTABLISHING A LAYER OF SAID METAL IN MOLTEN FORM COVERED BY A LAYER OF MOLTEN SLAG, CONTINUOUSLY WITHDRAWING SLAG FROM SAID SLAG LAYER, HEATING SAID WITHDRAWN SLAG BY CONTACT WITH COMBUSTION GAS CONTAINING OXIDIZING CONSTITUENTS IN A SEPARATE ZONE, RETURNING THE HEATED SLAG TO THE MOLTEN SLAG LAYER, SO AS TO FURNISH THE HEAT SUPPLY REQUIRED FOR REDUCING
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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) | 1954-06-18 | 1954-12-18 | 1955-06-19 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1958-06-18 | 1958-12-18 | 1959-06-19 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1962-06-18 | 1962-12-18 | 1963-06-19 | $7700.00 | Window Closed / Lapsed |