US3790339A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Cylindrical elongated furnace for treating material at high temperature in a gaseous atmosphere under high pressure
Assignee: ABB Norden Holding AB
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Filing: 1973-06-05
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Granted: 1974-02-05
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Expires: 1993-06-05
Abstract
Abstract A cylindrical elongated furnace for treating material at high temperature in a gaseous atmosphere under high pressure is formed of a high pressure cylinder with end closures projecting into it and a furnace chamber arranged in the high pressure cylinder. The furnace chamber is insulated from the walls of the pressure chamber by a cylindrical casing having gas-impermeable tubes arranged one inside the other with an insulation between them. At least one layer of insulating material in the casing engages only the outer or inner surface of one tube and is spaced from the adjoining tube, the space between being filled with gas. The insulating material may be held against the outside of one of the tubes by rings or a spiral strip running helically.
Inventors
- 👤 H Larker
- 👤 S Isaksson
- 👤 M Lindberg
- 👤 G Granberg
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 11:36
CPC Classifications
B; B30; B30B; B30B11/00; B30B11/001; B30B11/002; B22; B22F; B22F3/00; B22F3/12; B22F3/14; B22F3/15; C; C21; C21D; C21D1/00; C21D1/74; F; F27; F27D; F27D11/00; F27D11/02; H; H05; H05B; H05B3/00; H05B3/0014
Claims Analysis
Total Claims: 11
Claim 1
Independent Claim
131 words
Cylindrical elongated furnace for treating material at high temperature in a gaseous atmosphere under high pressure, including a cylindrical pressure chamber comprising a high pressure cylinder with end closures projecting into it, pressureabsorbing members which take up the axial forces exerted on the end closures, a furnace chamber arranged in the high pressure chamber, means insulating the furnace chamber from the walls of the pressure chamber comprising a Cylindrical casing having gasimpermeable tubes arranged one inside the other with insulation arranged between them, an insulating lid and an insulating bottom, in which there is at least one layer of insulating material in the casing, one side of said insulating material abutting one of the outer and inner surfaces of a tube and the other side facing a space filled with gas.
Claim 2
Dependent Claim
131 words
Cylindrical elongated furnace for treating material at high temperature in a gaseous atmosphere under high pressure, including a cylindrical pressure chamber comprising a high pressure cylinder with end closures projecting into it, pressureabsorbing members which take up the axial forces exerted on the end closures, a furnace chamber arranged in the high pressure chamber, means insulating the furnace chamber from the walls of the pressure chamber comprising a Cylindrical casing having gasimpermeable tubes arranged one inside the other with insulation arranged between them, an insulating lid and an insulating bottom, in which there is at least one layer of insulating material in the casing, one side of said insulating material abutting one of the outer and inner surfaces of a tube and the other side facing a space filled with gas.
Claim 3
Dependent Claim
13 words
Furnace according to claim 1, in which the tube is a metal tube.
Claim 4
Dependent Claim
14 words
Furnace according to claim 1, in which the insulating material is a fibrous material.
Claim 5
Dependent Claim
29 words
Furnace according to claim 1, in which means are provided for pressing the insulating material against the tube comprising at least one elongated member extending around the insulating material.
Claim 6
Dependent Claim
13 words
Furnace according to claim 4, in which such elongated member is arranged helically.
Claim 7
Dependent Claim
38 words
Furnace according to claim 4, in which the pressing means extends around the insulating material at least twice and the spacing of the pressing means is less than 5 times the thickness of the insulating layer compressed thereby.
Claim 8
Dependent Claim
12 words
Furnace according to claim 4, in which the pressing means is resilient.
Claim 9
Dependent Claim
15 words
Furnace according to claim 1, in which the insulating material is glued to the tube.
Claim 10
Dependent Claim
32 words
Furnace according to claim 1, in which the insulating casing includes three tubes arranged one inside the other, the insulating material including a layer of insulating material abutting only the central tube.
Claim 11
Dependent Claim
26 words
Furnace according to claim 9, in which the outer tube has a layer of insulating material on one of its faces abutting only the outer tube.
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) | 1977-02-04 | 1977-08-06 | 1978-02-05 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-02-04 | 1981-08-06 | 1982-02-05 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-02-04 | 1985-08-06 | 1986-02-05 | $7700.00 | Window Closed / Lapsed |