US3752456A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Vertical tubular furnace for high operating pressures
Assignee: ABB Norden Holding AB
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Filing: 1972-03-01
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Granted: 1973-08-14
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Expires: 1992-03-01
Abstract
Abstract A cylindrical elongated electric furnace placed in a pressure chamber for isostatic compression with its longitudinal axis substantially vertical. A heat-insulating mantle is provided for thermal isolation of the hot furnace chamber from the walls of the pressure chamber. This mantle is constructed of thin sheet metal arranged on a tubular frame and is free from insulating material of ceramic type. The sheet metal forms a plurality of cylindrical or conical layers located radially one outside the other and having gas-filled spaces between them.
Inventors
- 👤 H Larker
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 15:48
CPC Classifications
B; B30; B30B; B30B11/00; B30B11/001; B30B11/002; B01; B01J; B01J3/00; B01J3/04; B01J3/048; B22; B22F; B22F3/00; B22F3/12; B22F3/14; B22F3/15; F; F27; F27B; F27B3/00; F27B3/10; F27B3/12; H; H05; H05B; H05B3/00; H05B3/0014
Claims Analysis
Total Claims: 9
Claim 1
Independent Claim
151 words
Cylindrical elongated furnace for treating material at high temperature in a gaseous atmosphere which is under high pressure, the furnace (6) being positioned in a pressure chamber (1) with the longitudinal axis of the furnace directed substantially vertically, said furnace (6) containing a furnace chamber (7) provided with heating elements (8), a heat-insulating sheath enclosing the furnace chamber comprising an insulating mantle (9) with an insulating lid (11) and an insulating bottom (10), in which at least the innermost part of the heat-insulating mantle (9) comprises a tubular frame (13) and thin sheet metal on the tubular frame (13) forming a plurality of layers shaped as surfaces of revolution located radially one outside the other and having gas-filled spaces (14) between them, said spaces extending substantially in the longitudinal direction of the furnace (6) and communicating with the space outside the tubular frame at the lower parts of the spaces (14).
Claim 2
Dependent Claim
151 words
Cylindrical elongated furnace for treating material at high temperature in a gaseous atmosphere which is under high pressure, the furnace (6) being positioned in a pressure chamber (1) with the longitudinal axis of the furnace directed substantially vertically, said furnace (6) containing a furnace chamber (7) provided with heating elements (8), a heat-insulating sheath enclosing the furnace chamber comprising an insulating mantle (9) with an insulating lid (11) and an insulating bottom (10), in which at least the innermost part of the heat-insulating mantle (9) comprises a tubular frame (13) and thin sheet metal on the tubular frame (13) forming a plurality of layers shaped as surfaces of revolution located radially one outside the other and having gas-filled spaces (14) between them, said spaces extending substantially in the longitudinal direction of the furnace (6) and communicating with the space outside the tubular frame at the lower parts of the spaces (14).
Claim 3
Dependent Claim
24 words
Furnace according to claim 1, in which the thin sheet metal is a metal foil having a thickness of 0.1 mm at the most.
Claim 4
Dependent Claim
55 words
Furnace according to claim 1, in which the sheet metal is constructed of a plurality of truncated cones (12) made of metal foil which surround the tubular frame (13) and are arranged one above the other with the cone apex pointing upwardly, the upper edges of the cones (12) being attached to the frame (13).
Claim 5
Dependent Claim
49 words
Furnace according to claim 1, in which the sheet metal is a metal foil in the form of a strip (15) with irregular edges which is wound around the frame (13) and attached to the frame along the upper edge of the strip (15) following a substantially helical line.
Claim 6
Dependent Claim
19 words
Furnace according to claim 4, in which the metal foil (12,15) is attached to the frame (13) by welding.
Claim 7
Dependent Claim
17 words
Furnace according to claim 1, in which the strip (15) with irregular edges is formed by rolling.
Claim 8
Dependent Claim
25 words
Furnace according to claim 4, in which the strip (15) with irregular edges is shaped by folding together one edge of an originally straight strip.
Claim 9
Dependent Claim
22 words
Furnace according to claim 4, in which the strip (15) with irregular edges is composed of a plurality of joined trapezium-shaped pieces.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1976-08-13 | 1977-02-12 | 1977-08-14 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-08-13 | 1981-02-12 | 1981-08-14 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-08-13 | 1985-02-12 | 1985-08-14 | $7700.00 | Window Closed / Lapsed |