US3136624A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method for reducing metal oxides
Assignee: Hojalata y Lamina SA
•
Filing: 1961-05-24
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Granted: 1964-06-09
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Expires: 1981-05-24
Abstract
No abstract record available.
Inventors
- 👤 Charles K Mader
- 👤 Celada Juan
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 04:57
CPC Classifications
C; C21; C21B; C21B13/00; C21B13/04; C21B13/0073; Y; Y02; Y02P; Y02P10/00; Y02P10/10; Y02P10/134
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
134 words
A METHOD FOR REDUCING METAL OXIDES IN WHICH HEAT FOR REDUCTION OF METAL OXIDE IS PROVIDED BY DIRECT CONTACT OF REDUCING GAS WITH METAL OXIDE WHICH COMPRISES: PROVIDING A MASS OF PARTIALLY REDUCED METAL OXIDE AT AN ELEVATED TEMPERATURE IN A REDUCTION ZONE, INTRODUCING A STREAM COMPRISING A CARBON-CONTAINING REDUCING GAS TO SAID MASS OF PARTIALLY REUCED METAL OXIDE TO PREHEAT SAID STREAM AND CONCOMITANTLY COOL SAID MASS; CONTACTING A FURTHER PORTION OF SAID MASS WITH SAID THUSLY-HEATED STREAM TO CAUSE CRACKING OF A PORTION OF SAID REDUCING GAS WITH THE DEPOSITION OF CARBON ON SAID METAL OXIDE; GAS WITH THE DEPOSITION OF CARBON ON SAID METAL OXIDE; AND REDUCING A FURTHER PORTION OF SAID MASS WITH A PORTION OF THE REMAINING REDUCING GAS TO OBTAIN A PRODUCT COMPRISING A CARBON-CONTAINING REDUCED METAL OXIDE.
Claim 2
Independent Claim
134 words
A METHOD FOR REDUCING METAL OXIDES IN WHICH HEAT FOR REDUCTION OF METAL OXIDE IS PROVIDED BY DIRECT CONTACT OF REDUCING GAS WITH METAL OXIDE WHICH COMPRISES: PROVIDING A MASS OF PARTIALLY REDUCED METAL OXIDE AT AN ELEVATED TEMPERATURE IN A REDUCTION ZONE, INTRODUCING A STREAM COMPRISING A CARBON-CONTAINING REDUCING GAS TO SAID MASS OF PARTIALLY REUCED METAL OXIDE TO PREHEAT SAID STREAM AND CONCOMITANTLY COOL SAID MASS; CONTACTING A FURTHER PORTION OF SAID MASS WITH SAID THUSLY-HEATED STREAM TO CAUSE CRACKING OF A PORTION OF SAID REDUCING GAS WITH THE DEPOSITION OF CARBON ON SAID METAL OXIDE; GAS WITH THE DEPOSITION OF CARBON ON SAID METAL OXIDE; AND REDUCING A FURTHER PORTION OF SAID MASS WITH A PORTION OF THE REMAINING REDUCING GAS TO OBTAIN A PRODUCT COMPRISING A CARBON-CONTAINING REDUCED METAL OXIDE.
References Cited (Backward Citations)
US1370915A
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US1984727A
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US2107549A
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USRE19706E
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US2740706A
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US2900247A
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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) | 1967-06-09 | 1967-12-09 | 1968-06-09 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1971-06-09 | 1971-12-09 | 1972-06-09 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1975-06-09 | 1975-12-09 | 1976-06-09 | $7700.00 | Window Closed / Lapsed |