US3829595A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Electric direct-arc furnace
Assignee: IHI Corp
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Filing: 1973-01-24
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Granted: 1974-08-13
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Expires: 1993-01-24
Abstract
Abstract A furnace proper of an electric direct-arc furnace characterized in that the furnace wall is constructed in a required form with a plurality of cooling blocks each of which comprises a cooling block proper made of a special metal the inner surface of which is lined with a refractory material and a cooling water tube embedded therein, so as to increase the life of the furnace wall.
Inventors
- 👤 A Nakamura
- 👤 T Nanjyo
- 👤 M Aoshika
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 21:56
CPC Classifications
F; F27; F27D; F27D1/00; F27D1/12; H; H05; H05B; H05B7/00; H05B7/02; F27D9/00; F27D2009/0002; F27D2009/0045; F27D2009/0048; F27D2009/0051
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
148 words
An electric arc furnace comprising a wall and a bottom forming a receptacle for molten metal, the wall comprising at least one hot spot cooling block, said block comprising an outer shell of cast steel having a continuous outer surface, the inner surface of said shell being provided with a plurality of vertically spaced grooves, a refractory brick positioned in each groove with a part protruding inwardly of the furnace from the inner surface of the cast steel shell leaving a space between the protruding parts of each pair of adjacent refractory bricks, refractory material filling the spaces between the protruding parts of adjacent refractory bricks and the spaces adjacent the protruding bricks at the ends of the block, and a tube embedded in the cast steel outer shell of the block with its ends exterior to the shell whereby cooling fluid may be passed through the tube.
Claim 2
Dependent Claim
148 words
An electric arc furnace comprising a wall and a bottom forming a receptacle for molten metal, the wall comprising at least one hot spot cooling block, said block comprising an outer shell of cast steel having a continuous outer surface, the inner surface of said shell being provided with a plurality of vertically spaced grooves, a refractory brick positioned in each groove with a part protruding inwardly of the furnace from the inner surface of the cast steel shell leaving a space between the protruding parts of each pair of adjacent refractory bricks, refractory material filling the spaces between the protruding parts of adjacent refractory bricks and the spaces adjacent the protruding bricks at the ends of the block, and a tube embedded in the cast steel outer shell of the block with its ends exterior to the shell whereby cooling fluid may be passed through the tube.
Claim 3
Dependent Claim
19 words
An electric arc furnace according to claim 1, in which the entire wall comprises said hot spot cooling blocks.
Claim 4
Dependent Claim
32 words
An electric arc furnace according to claim 1, in which the inner surfaces of the refractory bricks and the refractory material are aligned to provide a smooth inner surface for the block.
Claim 5
Dependent Claim
143 words
As a new article of manufacture, a hot spot cooling block for incorporation into the wall of an electric arc furnace, said block comprising an outer shell of cast steel having a continuous outer surface, the inner surface of said shell being provided with a plurality of vertically spaced grooves, a refractory brick positioned in each groove with a part protruding inwardly of the furnace from the inner surface of the cast steel shell leaving a space between the protruding partS of each pair of adjacent refractory bricks, refractory material filling the spaces between the protruding parts of adjacent refractory bricks and the spaces adjacent the protruding bricks at the ends of the block, and a tube embedded in the cast steel outer shell of the block with its ends exterior to the shell whereby cooling fluid may be passed through the tube.
Claim 6
Dependent Claim
143 words
As a new article of manufacture, a hot spot cooling block for incorporation into the wall of an electric arc furnace, said block comprising an outer shell of cast steel having a continuous outer surface, the inner surface of said shell being provided with a plurality of vertically spaced grooves, a refractory brick positioned in each groove with a part protruding inwardly of the furnace from the inner surface of the cast steel shell leaving a space between the protruding partS of each pair of adjacent refractory bricks, refractory material filling the spaces between the protruding parts of adjacent refractory bricks and the spaces adjacent the protruding bricks at the ends of the block, and a tube embedded in the cast steel outer shell of the block with its ends exterior to the shell whereby cooling fluid may be passed through the tube.
Claim 7
Dependent Claim
33 words
A new article of manufacture according to claim 4, in which the inner surfaces of the refractory bricks and the refractory material are aligned to provide a smooth inner surface for the block.
References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1977-08-12 | 1978-02-11 | 1978-08-13 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-08-12 | 1982-02-11 | 1982-08-13 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-08-12 | 1986-02-11 | 1986-08-13 | $7700.00 | Window Closed / Lapsed |