US3273993A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Process of reduction roasting of iron ore with metallic iron
Assignee: Individual
•
Filing: 1964-01-30
•
Granted: 1966-09-20
•
Expires: 1984-01-30
Abstract
No abstract record available.
Inventors
- 👤 Norwood B Melcher
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 14:47
CPC Classifications
C; C21; C21B; C21B13/00; C21B13/008; Y; Y02; Y02P; Y02P10/00; Y02P10/10; Y02P10/134
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
63 words
A METHOD FOR REDUCTION OF NON-MAGNETIC IRON ORE COMPRISING MIXING SAID ORE WITH METALLIC IRON-CONTAINING MATERIAL AND HEATING SAID MIXTURE TO ELEVATED TEMPERATURE IN AN ATMOSPHERE SELECTED FROM THE GROUP CONSISTING OF CO2 GAS, WATER VAPOR, AND A MIXTURE OF CO2 GAS AND WATER VAPOR TO EFFECT A REACTION IN WHICH SAID ORE IS REDUCED AT LEAST IN PART OF MAGNETIC IRON OXIDE.
Claim 2
Independent Claim
63 words
A METHOD FOR REDUCTION OF NON-MAGNETIC IRON ORE COMPRISING MIXING SAID ORE WITH METALLIC IRON-CONTAINING MATERIAL AND HEATING SAID MIXTURE TO ELEVATED TEMPERATURE IN AN ATMOSPHERE SELECTED FROM THE GROUP CONSISTING OF CO2 GAS, WATER VAPOR, AND A MIXTURE OF CO2 GAS AND WATER VAPOR TO EFFECT A REACTION IN WHICH SAID ORE IS REDUCED AT LEAST IN PART OF MAGNETIC IRON OXIDE.
References Cited (Backward Citations)
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Cited
US1001536A
Cited
US2523138A
Cited
US2648600A
Cited
US2944884A
Cited
US3097156A
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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) | 1969-09-19 | 1970-03-21 | 1970-09-20 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1973-09-19 | 1974-03-21 | 1974-09-20 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1977-09-19 | 1978-03-21 | 1978-09-20 | $7700.00 | Window Closed / Lapsed |