Patent US3765870A successfully refreshed from Google Patents.
US3765870A
Expired / Lapsed
US
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Method of direct ore reduction using a short cap arc heater
Assignee: Westinghouse Electric Corp
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Filing: 1971-12-15
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Granted: 1973-10-16
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Expires: 1991-12-15
Abstract
Abstract The oxides of certain metals including iron, chromium, manganese, vanadium and titanium may be finely ground or otherwise pulverized and supplied in a gas flow stream to the heating region of an arc heater. In the heating region an electric arc capable of producing temperatures sufficient to free hydrocarbon radical ions from hydrocarbon gas may be used to assist in separating the metal from the metal oxide ore.
Inventors
- 👤 M Fey
- 👤 G Kemeny
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 22:50
CPC Classifications
H; H05; H05B; H05B7/00; H05B7/18; H05B7/185; C; C22; C22B; C22B4/00
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
53 words
The method as claimed in clAim 1, including the additional step of: moving the roots of said arc generally circumferentially along the inner surfaces of said electrodes by interaction of the electric current of said arc near said surface with magnetic field lines generated by a magnetic field producing means adjacent said electrodes.
Claim 2
Dependent Claim
20 words
The method as claimed in claim 2, wherein said metal oxide comprises iron oxide and said hydrocarbon gas comprises methane.
Claim 3
Dependent Claim
20 words
The method as claimed in claim 2, wherein said metal oxide comprises iron oxide and said hydrocarbon gas comprises propane.
Claim 4
Dependent Claim
20 words
The method as claimed in claim 2, wherein said metal oxide comprises iron oxide and said hydrocarbon gas comprises acetylene.
References Cited (Backward Citations)
US3390979A
Cited
US3389189A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1976-10-15 | 1977-04-16 | 1977-10-16 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-10-15 | 1981-04-16 | 1981-10-16 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-10-15 | 1985-04-16 | 1985-10-16 | $7700.00 | Window Closed / Lapsed |