US3860223A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Melting furnace
Assignee: FLUXO
•
Filing: 1973-08-23
•
Granted: 1975-01-14
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Expires: 1993-08-23
Abstract
Abstract A melting furnace constituted by a crucible supported at its periphery by a gas-tight refractory structure forming a combustion chamber having a furner fitted at the bottom and a duct for evacuating burnt gases disposed at one of its sides.
Inventors
- 👤 Paul C Berger
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 23:49
CPC Classifications
F; F27; F27B; F27B14/00; F27B14/08; F27B14/14; F27B14/143; F27B2014/0825; F27D; F27D9/00; Y; Y10; Y10S; Y10S266/00; Y10S266/90
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
139 words
An improvement for a melting furnace of the type that includes a crucible, a gas-tight refractory structure surrounding the periphery of the crucible, and means for heating the crucible, the improvement comprising a wall spaced apart from the outer surface of the refractory structure, the wall surrounding thE refractory structure along the sides and top thereof to form a chamber extending at least around and above the refractory structure, outlet means in the wall through which gas in the chamber can be withdrawn, first and second inlet means in the wall communicating with the outlet means, the first inlet means comprising a space between the upper periphery of the crucible and the wall through which gas emanating from the crucible can flow, the second inlet means comprising an opening in the wall through which gas can enter the chamber.
Claim 2
Dependent Claim
139 words
An improvement for a melting furnace of the type that includes a crucible, a gas-tight refractory structure surrounding the periphery of the crucible, and means for heating the crucible, the improvement comprising a wall spaced apart from the outer surface of the refractory structure, the wall surrounding thE refractory structure along the sides and top thereof to form a chamber extending at least around and above the refractory structure, outlet means in the wall through which gas in the chamber can be withdrawn, first and second inlet means in the wall communicating with the outlet means, the first inlet means comprising a space between the upper periphery of the crucible and the wall through which gas emanating from the crucible can flow, the second inlet means comprising an opening in the wall through which gas can enter the chamber.
Claim 3
Dependent Claim
49 words
The improvement in claim 1, wherein the chamber includes (a) a lateral outer wall resting on a base, and (b) an annular cover which has an outer downwardly extending lip which caps the lateral wall and an inner downwardly extending lip which terminates near the periphery of the crucible.
Claim 4
Dependent Claim
45 words
The improvement in claim 2, wherein the second inlet means is disposed near the exhaust means, and the chamber includes partition means therein between the outlet means and the second inlet means for blocking the flow of gas between them along the closest distance therebetween.
References Cited (Backward Citations)
US1896951A
Cited
US2606016A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1978-01-13 | 1978-07-15 | 1979-01-14 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-01-13 | 1982-07-15 | 1983-01-14 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-01-13 | 1986-07-15 | 1987-01-14 | $7700.00 | Window Closed / Lapsed |