US3721743A
Expired / Lapsed
US
⏱️ 0.0 years remaining
An electric smelting furnace of the closed type
Assignee: Tanabe Kakoki Co Ltd
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Filing: 1971-09-15
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Granted: 1973-03-20
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Expires: 1991-09-15
Abstract
Abstract A closed electric smelting furnace is provided with a cylindrical partition wall of substantially the same height as the furnace lid secured to the underside of the lid in a position to surround the electrodes and material feeding chutes. The partition together with the lid defines an annular gas collecting chamber. The raw materials are charged into the furnace to a level where they extend into the annular gas collecting chamber. Dust rich furnace gases rise quickly around the electrodes and collect in the upper portion of the chamber after which they pass slowly outwardly through the raw material so that they are filtered before leaving the furnace though a vent in the furnace lid which is positioned radially outwardly of the partition.
Inventors
- 👤 T Shiina
- 👤 I Tisaki
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 21:42
CPC Classifications
F; F27; F27D; F27D17/00; F27D17/30; F27D17/304; F27B; F27B3/00; F27B3/06
Claims Analysis
Total Claims: 3
Claim 1
Independent Claim
162 words
An electric smelting furnace of the closed type comprising; a body for holding the raw materials to be smelted; an inverted cup-shaped closed cover for said body, supportIng the furnace electrodes and feed chutes for charging raw material into said body; a cylindrical partition extending downwardly from the inner upper surface of said cover, said partition surrounding the electrodes and at least some of the feed chutes and separating the upper area of said furnace into outer and inner portions; and a gas vent extending through said cover and communicating with said outer portion; whereby when raw material is charged into said body to a level extending above the lower level of said partition, the majority of gases evolved during smelting pass rapidly upwardly along said electrodes, accumulate in said inner portion and then bleed slowly into said outer portion through the raw material thus filtering a substantial portion of dust particles from the gases before they pass out through said vent.
Claim 2
Dependent Claim
162 words
An electric smelting furnace of the closed type comprising; a body for holding the raw materials to be smelted; an inverted cup-shaped closed cover for said body, supportIng the furnace electrodes and feed chutes for charging raw material into said body; a cylindrical partition extending downwardly from the inner upper surface of said cover, said partition surrounding the electrodes and at least some of the feed chutes and separating the upper area of said furnace into outer and inner portions; and a gas vent extending through said cover and communicating with said outer portion; whereby when raw material is charged into said body to a level extending above the lower level of said partition, the majority of gases evolved during smelting pass rapidly upwardly along said electrodes, accumulate in said inner portion and then bleed slowly into said outer portion through the raw material thus filtering a substantial portion of dust particles from the gases before they pass out through said vent.
Claim 3
Dependent Claim
52 words
A furnace as defined by claim 1 including a pair of valved air inlet pipes extending through said cover one communicating with said inner and outer portions respectively and a series of openings extending radially through said partition functioning as pilot flame holes conducting flames from said inner to said outer portions.
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) | 1976-03-19 | 1976-09-18 | 1977-03-20 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-03-19 | 1980-09-18 | 1981-03-20 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-03-19 | 1984-09-18 | 1985-03-20 | $7700.00 | Window Closed / Lapsed |