US2547685A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Reduction of metallic oxides
Assignee: Brassert & Co
•
Filing: 1947-11-25
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Granted: 1951-04-03
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Expires: 1967-11-25
Abstract
No abstract record available.
Inventors
- 👤 Herman A Brassert
- 👤 Jahn Fredrik W De
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 23:23
CPC Classifications
C; C21; C21B; C21B13/00; C21B13/0073; C21B13/02; C21B2100/00; C21B2100/20; C21B2100/22; C21B2100/26; Y; Y02; Y02P; Y02P10/00; Y02P10/10; Y02P10/134
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
124 words
A METHOD OF REDUCING IRON OXIDES WHICH COMPRISES BRINGING IRON HEATED TO BETWEEN ABOUT 750* C. AND ABOUT 900* C. INTO CONTACT WITH A HEATED REDUCING GAS CONSISTING ESSENTIALLY OF CARBON MONOXIDE AND HYDROGEN IN THE RATIO OF ABOUT THREE TO ABOUT FOUR PARTS BY VOLUME OF CARBON MONOXIDE TO EACH PART OF HYDROGEN BY VOLUME, INTRODUCING WATER VAPOR ITO SAID GAS TO MAINTAIN THE WATER CONTENT TO THE GAS WITHIN A RANGE BETWEEN ABOUT .002 AND ABOUT .01 POUND OF WATER VAPOR PER CUBIC FOOT OF GAS AND INCREASING THE WATER VAPOR CONTENT, WITHIN SAID RANGE TO DECREASE THE CARBON CONTENT OF THE REDUCED OXIDE, AND DECREASING THE WATER VAPOR CONTENT, WITHIN SAID RANGE, TO INCREASE THE CARBON CONTENT OF THE REDUCED OXIDE.
Claim 2
Independent Claim
124 words
A METHOD OF REDUCING IRON OXIDES WHICH COMPRISES BRINGING IRON HEATED TO BETWEEN ABOUT 750* C. AND ABOUT 900* C. INTO CONTACT WITH A HEATED REDUCING GAS CONSISTING ESSENTIALLY OF CARBON MONOXIDE AND HYDROGEN IN THE RATIO OF ABOUT THREE TO ABOUT FOUR PARTS BY VOLUME OF CARBON MONOXIDE TO EACH PART OF HYDROGEN BY VOLUME, INTRODUCING WATER VAPOR ITO SAID GAS TO MAINTAIN THE WATER CONTENT TO THE GAS WITHIN A RANGE BETWEEN ABOUT .002 AND ABOUT .01 POUND OF WATER VAPOR PER CUBIC FOOT OF GAS AND INCREASING THE WATER VAPOR CONTENT, WITHIN SAID RANGE TO DECREASE THE CARBON CONTENT OF THE REDUCED OXIDE, AND DECREASING THE WATER VAPOR CONTENT, WITHIN SAID RANGE, TO INCREASE THE CARBON CONTENT OF THE REDUCED OXIDE.
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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) | 1954-04-02 | 1954-10-02 | 1955-04-03 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1958-04-02 | 1958-10-02 | 1959-04-03 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1962-04-02 | 1962-10-02 | 1963-04-03 | $7700.00 | Window Closed / Lapsed |