Patent US3705303A successfully refreshed from Google Patents.
Patent US3558791A successfully refreshed from Google Patents.
US3558791A
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Cupola furnace
Assignee: Individual
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Filing: 1967-02-06
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Granted: 1971-01-26
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Expires: 1987-02-06
Abstract
Abstract A cupola furnace is provided with at least one tunnel extending from the combustion chamber at the bottom of the shaft, for the combustion of gases passing electrodes in the tunnel which produce arc discharge, and for conveying the combustion gases to said combustion chamber.
Inventors
- 👤 Vladimir Alexandrovich Grachev
- 👤 Anatoly Alexeevich Cherny
- 👤 Lev Mikhailovich Marienbakh
- 👤 Ivan Lukich Kurbatsky
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 09:44
CPC Classifications
F; F27; F27B; F27B1/00; F27B1/08; Y; Y10; Y10S; Y10S266/00; Y10S266/90
Claims Analysis
Total Claims: 5
Claim 1
Independent Claim
80 words
A cupola furnace for melting and superheating metal, comprising means defining a compartment for the processing of said metal, a hearth in said compartment having a well for receiving molten metal, mEans providing at least one tunnel extending into said compartment towards said well for the combustion of a gaseous fuel, and electrodes in said tunnel for creating arc discharges to generate heat and to burn said fuel, said tunnel guiding the heat toward the molten metal in the well.
Claim 2
Dependent Claim
80 words
A cupola furnace for melting and superheating metal, comprising means defining a compartment for the processing of said metal, a hearth in said compartment having a well for receiving molten metal, mEans providing at least one tunnel extending into said compartment towards said well for the combustion of a gaseous fuel, and electrodes in said tunnel for creating arc discharges to generate heat and to burn said fuel, said tunnel guiding the heat toward the molten metal in the well.
Claim 3
Dependent Claim
43 words
A cupola furnace according to claim 1, wherein one electrode is made in the form of a ring, and the other has the shape of a rod encircled by said ring and is capable of moving toward and away from said annular electrode.
Claim 4
Dependent Claim
40 words
A cupola furnace according to claim 1, wherein the first said means comprises first and second connected sections defining a shaft constituting at least part of said compartment, said tunnel extending obliquely downwards to said shaft at the bottom thereof.
Claim 5
Dependent Claim
22 words
A cupola furnace according to claim 3 comprising a tuyere opening into said tunnel at an end thereof remote from said shaft.
References Cited (Backward Citations)
US3004137A
Cited
US3338707A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1974-01-25 | 1974-07-27 | 1975-01-26 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-01-25 | 1978-07-27 | 1979-01-26 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-01-25 | 1982-07-27 | 1983-01-26 | $7700.00 | Window Closed / Lapsed |