Patent US3790340A successfully refreshed from Google Patents.
US3790340A
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US
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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 In a cylindrical elongated furnace for treating material at high temperature in a gaseous atmosphere under high pressure, the furnace chamber is insulated from the walls of the pressure chamber by at least three tubular parts arranged one inside the other with insulating parts. At least one ring is provided attached to one of the tubular parts and having a downwardly and inwardly sloping similar part secured to the inside of this part and directed towards, but terminating short of, the opposed part.
Inventors
- 👤 S Isaksson
- 👤 H Larker
- 👤 M Lindberg
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 21:47
CPC Classifications
B; B30; B30B; B30B11/00; B30B11/001; B30B11/002; B22; B22F; B22F3/00; B22F3/12; B22F3/14; B22F3/15
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
136 words
Cylindrical elongated furnace for treating material at high temperature in a gaseous atmosphere under high pressure, comprising a cylindrical pressure chamber including a high pressure cylinder and end closures projecting into the high pressure cylinder, pressure-absorbing members which take up axial forces exerted on the end closures, and a furnace chamber arranged in the pressure chamber, a cylindrical casing insulating said furnace chamber from the walls of the pressure chamber, said cylindrical insulating casing having at least three tubular parts arranged one inside the other with insulating material between such parts, an insulating lid and an insulating bottom, at least one ring 52 arranged between two of said tubular parts 44,45 having less radial extension than the radial distance between the said tubular parts 44,45 and being gas-tightly connected to one of said tubular parts 45.
Claim 2
Dependent Claim
136 words
Cylindrical elongated furnace for treating material at high temperature in a gaseous atmosphere under high pressure, comprising a cylindrical pressure chamber including a high pressure cylinder and end closures projecting into the high pressure cylinder, pressure-absorbing members which take up axial forces exerted on the end closures, and a furnace chamber arranged in the pressure chamber, a cylindrical casing insulating said furnace chamber from the walls of the pressure chamber, said cylindrical insulating casing having at least three tubular parts arranged one inside the other with insulating material between such parts, an insulating lid and an insulating bottom, at least one ring 52 arranged between two of said tubular parts 44,45 having less radial extension than the radial distance between the said tubular parts 44,45 and being gas-tightly connected to one of said tubular parts 45.
Claim 3
Dependent Claim
35 words
Furnace according to claim 1, in which the generatrix of the ring, at least along part of its length, is inclined with respect to a radial plane perpendicular to the longitudinal axis of tHe cylinder.
Claim 4
Dependent Claim
25 words
Furnace according to claim 1, in which the ring 52a is attached in a gas-tight manner to the outer of the two tubular parts 44,45.
Claim 5
Dependent Claim
31 words
Furnace according to claim 3, in which the generatrix of the ring is directed downward in relation to the connection with the tubular part 45 to which it is gas-tightly joined.
Claim 6
Dependent Claim
15 words
Furnace according to claim 1, in which the ring 52a is at least partially funnel-shaped.
Claim 7
Dependent Claim
23 words
Furnace according to claim 5, in which the ring 52a comprises a substantially cylindrical part 52b and at least one funnel-shaped part 52c.
Claim 8
Dependent Claim
28 words
Furnace according to claim 1, in which the tubular part 45 to which the ring 52 is connected is constructed in sections which are jointed at ring connections.
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 |