Patent US2638414A successfully refreshed from Google Patents.
US2638414A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Process of recovering metals by gaseous reduction
Assignee: Standard Oil Development Co
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Filing: 1948-07-30
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Granted: 1953-05-12
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Expires: 1968-07-30
Abstract
No abstract record available.
Inventors
- 👤 Warren K Lewis
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 04:07
CPC Classifications
C; C21; C21B; C21B13/00; C21B13/14; C21B13/0033; Y; Y02; Y02P; Y02P10/00; Y02P10/10; Y02P10/134; Y02P10/143
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
148 words
A METHOD OF RECOVERING METAL FROM A SOLID, FINELY DIVIDED COMPOUND THEREOF WHICH IS REDUCIBLE TO METAL BY HYDROGEN WHICH COMPRISES MAINTAINING A DENSE, TURBULENT MASS OF SAID METAL COMPOUND FLUIDIZED BY AN UPWARDLY FLOWING GAS STREAM TO RESEMBLE A BOILING LIQUID HAVING A WELL DEFINED LEVEL WITHIN A REDUCTION ZONE AT REDUCTION TEMPERATURE, CAUSING SAID FLUIDIZED MASS OF METAL COMPOUND TO FLOW DOWNWARDLY AGAINST THE UPWARDLY FLOWING STREAM OF GAS, LIMITING THE BACK-MIXING OF SOLIDS IN A VERTICAL DIRECTION BY OBSTRUCTING THE FREE, VERTICAL FLOW OF SOLIDS AND GASES AT LEAST AT ONE POINT ALONG THEIR VERTICAL PATH WITHIN THE REDUCTION ZONE, CONTACTING SAID MASS WITH AN AMOUNT OF HYDROGEN IN EXCESS OF THAT REQUIRED FOR REDUCING SAID COMPOUND TO METAL, SUPPLYING HEATED FINELY DIVIDED METAL COMPOUND PARTICLES TO SAID REDUCTION ZONE, WITHDRAWING A GAS MIXTURE CONTAINING HYDROGEN AND STEAM FROM AN UPPER PORTION OF SAID REDUCTION
Claim 2
Independent Claim
148 words
A METHOD OF RECOVERING METAL FROM A SOLID, FINELY DIVIDED COMPOUND THEREOF WHICH IS REDUCIBLE TO METAL BY HYDROGEN WHICH COMPRISES MAINTAINING A DENSE, TURBULENT MASS OF SAID METAL COMPOUND FLUIDIZED BY AN UPWARDLY FLOWING GAS STREAM TO RESEMBLE A BOILING LIQUID HAVING A WELL DEFINED LEVEL WITHIN A REDUCTION ZONE AT REDUCTION TEMPERATURE, CAUSING SAID FLUIDIZED MASS OF METAL COMPOUND TO FLOW DOWNWARDLY AGAINST THE UPWARDLY FLOWING STREAM OF GAS, LIMITING THE BACK-MIXING OF SOLIDS IN A VERTICAL DIRECTION BY OBSTRUCTING THE FREE, VERTICAL FLOW OF SOLIDS AND GASES AT LEAST AT ONE POINT ALONG THEIR VERTICAL PATH WITHIN THE REDUCTION ZONE, CONTACTING SAID MASS WITH AN AMOUNT OF HYDROGEN IN EXCESS OF THAT REQUIRED FOR REDUCING SAID COMPOUND TO METAL, SUPPLYING HEATED FINELY DIVIDED METAL COMPOUND PARTICLES TO SAID REDUCTION ZONE, WITHDRAWING A GAS MIXTURE CONTAINING HYDROGEN AND STEAM FROM AN UPPER PORTION OF SAID REDUCTION
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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) | 1956-05-11 | 1956-11-10 | 1957-05-12 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1960-05-11 | 1960-11-10 | 1961-05-12 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1964-05-11 | 1964-11-10 | 1965-05-12 | $7700.00 | Window Closed / Lapsed |