Patent US3052533A successfully refreshed from Google Patents.
US3052533A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Process for the direct reduction of iron
Assignee: Individual
•
Filing: 1961-03-27
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Granted: 1962-09-04
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Expires: 1981-03-27
Abstract
No abstract record available.
Inventors
- 👤 Alfred M Thomsen
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 20:04
CPC Classifications
C; C21; C21B; C21B13/00; C21B13/0073; Y; Y02; Y02P; Y02P10/00; Y02P10/10; Y02P10/134
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
66 words
THE METHOD OF REDUCING AN IRON OXIDE TO METALLIC IRON WHICH COMPRISES: COMMINGLING SAID IRON OXIDE WITH A REDUCING GASEOUS MIXTURE, CONSISTING ESSENTIALLY OF HYDROGEN, CARBON MONOXIDE AND NITROGEN, FORMED IN A GASPRODUCER OPERATION FROM FUEL, AND THE EXHAUST GAS OF A GAS TURBINE, AT NON-SINTERING TEMPERATURES UNTIL SAID IRON OXIDE SHALL HAVE BEEN SUBSTANTIALLY CONVERTED TO METALLIC IRON; BURNING THE RESULTANT PARTIALLY SPENT REDUCING GAS,
Claim 2
Independent Claim
66 words
THE METHOD OF REDUCING AN IRON OXIDE TO METALLIC IRON WHICH COMPRISES: COMMINGLING SAID IRON OXIDE WITH A REDUCING GASEOUS MIXTURE, CONSISTING ESSENTIALLY OF HYDROGEN, CARBON MONOXIDE AND NITROGEN, FORMED IN A GASPRODUCER OPERATION FROM FUEL, AND THE EXHAUST GAS OF A GAS TURBINE, AT NON-SINTERING TEMPERATURES UNTIL SAID IRON OXIDE SHALL HAVE BEEN SUBSTANTIALLY CONVERTED TO METALLIC IRON; BURNING THE RESULTANT PARTIALLY SPENT REDUCING GAS,
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1965-09-03 | 1966-03-05 | 1966-09-04 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1969-09-03 | 1970-03-05 | 1970-09-04 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1973-09-03 | 1974-03-05 | 1974-09-04 | $7700.00 | Window Closed / Lapsed |