Patent US3157488A successfully refreshed from Google Patents.
US3157488A
Expired / Lapsed
US
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Method for direct reduction of metal oxides
Assignee: Individual
•
Filing: 1960-09-27
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Granted: 1964-11-17
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Expires: 1980-09-27
Abstract
No abstract record available.
Inventors
- 👤 Charlton A Taylor
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 17:38
CPC Classifications
C; C22; C22B; C22B5/00; C22B5/02; C22B5/16; C21; C21B; C21B13/00; C21B13/08; Y; Y02; Y02P; Y02P10/00; Y02P10/10; Y02P10/134
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
169 words
A BATCH METHOF DIRECT REDUCTION OF METAL OXIDES WITHIN A HEATED CLOSED CHAMBER ROTATABLE ABOUT ITS HORIZONTAL AXIS, COMPRISING THE STEPS OF: (A) CHARGING A MEASURED BATH OF PULVERIZED METAL OXIDES INTO THE CHAMBER, NOT IN EXCESS OF ABOUT ONEHALF THE CAPACITY THEREOF, (B) ORTATING THE CHAMBER IN ALTERNATE OPPOSITE DIRECTIONS WHILE RAISING THE TEMPERATURE OF THE INTERIOR THEREOF AND ITS CONTENTS TO ABOUT 1000*F. FOR REMOVING MOISTURE AND OTHER VOLATIZABLE MATTER FROM THE OXIDES, (C) DISCONTINUING ROTATION OF THE CHAMBER AND WITHDRAWING THE VOLALTILE MATTER THEREFROM, (D) CHARGING A MEASURED VOLUME OF A GASEOUS REDUCTANT THEREIN WHICH IS LESS THAN THAT TO REDUCE THE OXIDE TO METAL AND RESUMING ROTATION OF THE CHAMBER IN ALTERNATE OPPOSITE DIRECTIONS WHILE MAINTAINING A CHAMBER INTERIOR TMEPERATURE AND ITS CONTENTS ABOVE THE TEMPERATURE OF REACTION AND BELOW A TEMPPERATURE CAUSING TACKINESS OF THE SURFACE OF THE OXIDE PARTICLES TO EFFECT AT LEAST PARTIAL REDUCTION THEREOF, (E) DISCONTINUING CHAMBER ROTATION AND WITHDRAWING THE SPENT GASEOUS REDUCTANT AND OTHER VOLATILES FROM THE CHAMBER INTERIOR,
Claim 2
Dependent Claim
169 words
A BATCH METHOF DIRECT REDUCTION OF METAL OXIDES WITHIN A HEATED CLOSED CHAMBER ROTATABLE ABOUT ITS HORIZONTAL AXIS, COMPRISING THE STEPS OF: (A) CHARGING A MEASURED BATH OF PULVERIZED METAL OXIDES INTO THE CHAMBER, NOT IN EXCESS OF ABOUT ONEHALF THE CAPACITY THEREOF, (B) ORTATING THE CHAMBER IN ALTERNATE OPPOSITE DIRECTIONS WHILE RAISING THE TEMPERATURE OF THE INTERIOR THEREOF AND ITS CONTENTS TO ABOUT 1000*F. FOR REMOVING MOISTURE AND OTHER VOLATIZABLE MATTER FROM THE OXIDES, (C) DISCONTINUING ROTATION OF THE CHAMBER AND WITHDRAWING THE VOLALTILE MATTER THEREFROM, (D) CHARGING A MEASURED VOLUME OF A GASEOUS REDUCTANT THEREIN WHICH IS LESS THAN THAT TO REDUCE THE OXIDE TO METAL AND RESUMING ROTATION OF THE CHAMBER IN ALTERNATE OPPOSITE DIRECTIONS WHILE MAINTAINING A CHAMBER INTERIOR TMEPERATURE AND ITS CONTENTS ABOVE THE TEMPERATURE OF REACTION AND BELOW A TEMPPERATURE CAUSING TACKINESS OF THE SURFACE OF THE OXIDE PARTICLES TO EFFECT AT LEAST PARTIAL REDUCTION THEREOF, (E) DISCONTINUING CHAMBER ROTATION AND WITHDRAWING THE SPENT GASEOUS REDUCTANT AND OTHER VOLATILES FROM THE CHAMBER INTERIOR,
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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) | 1967-11-17 | 1968-05-18 | 1968-11-17 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1971-11-17 | 1972-05-18 | 1972-11-17 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1975-11-17 | 1976-05-18 | 1976-11-17 | $7700.00 | Window Closed / Lapsed |