US3598378A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Furnace for heat-treating objects under high pressure
Assignee: ABB Norden Holding AB
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Filing: 1969-09-08
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Granted: 1971-08-10
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Expires: 1989-09-08
Abstract
Abstract A furnace for treating material at high pressure and high temperature includes a pressure chamber and a cylindrical sheath within and spaced from the pressure chamber. The sheath is formed of three concentric annular walls forming between them substantially closed inner and outer shells. The interior of the inner shell constitutes the furnace chamber. The spaces between the walls are filled with insulating material, and the spaces between the walls open into the furnace chamber and the space between the pressure chamber and the sheath. The inner annular wall is formed of a material having a smaller coefficient of expansion than the material of the other annular walls.
Inventors
- 👤 Hans Lundstrom
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 18:00
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; F27B; F27B3/00; F27B3/10; F27B3/12; F27B5/00; F27B5/04
Claims Analysis
Total Claims: 9
Claim 1
Independent Claim
101 words
Cylindrical furnace for treating material with high temperature in a gaseous atmosphere under high pressure, comprising pressure chamber, a heat-insulating cylindrical sheath within and spaced from the pressure chamber, the interior of which constitutes a furnace chamber and which is composed of at least three annular walls forming between them substantially closed inner and outer cells comprising insulating material and provided with a pressure-equalizing opening from at least one of the cells to the outside thereof, in which the inner annular wall consists essentially of a material having a smaller coefficient of expansion than the material in the other annular walls.
Claim 2
Dependent Claim
101 words
Cylindrical furnace for treating material with high temperature in a gaseous atmosphere under high pressure, comprising pressure chamber, a heat-insulating cylindrical sheath within and spaced from the pressure chamber, the interior of which constitutes a furnace chamber and which is composed of at least three annular walls forming between them substantially closed inner and outer cells comprising insulating material and provided with a pressure-equalizing opening from at least one of the cells to the outside thereof, in which the inner annular wall consists essentially of a material having a smaller coefficient of expansion than the material in the other annular walls.
Claim 3
Dependent Claim
15 words
Furnace according to claim 1, in which the annular walls are constructed of sheet metal.
Claim 4
Dependent Claim
18 words
Furnace according to claim 2, in which the cells formed between the walls are filled with insulating material.
Claim 5
Dependent Claim
47 words
Furnace according to claim 3, the inner and the middle wall and between the middle and the outer wall are spaced apart by such distances that the absolute expansion (at temperature equality) of the inner and the middle sheath parts is approximately equal in the absolute measurements.
Claim 6
Dependent Claim
23 words
Furnace according to claim 2, in which the inner wall is constructed of ferritic steel and the middle wall of austenitic stainless steel.
Claim 7
Dependent Claim
24 words
Furnace according to claim 2, in which the inner wall is constructed of molybdenum and the middle wall is constructed of austenitic stainless steel.
Claim 8
Dependent Claim
19 words
Furnace according to claim 2, in which an element is arranged near the middle wall to heat this wall.
Claim 9
Dependent Claim
27 words
Furnace according to claim 1 having pressure-equalizing openings between the inner cell and the furnace chamber and between the outer cell and the space outside the sheath.
References Cited (Backward Citations)
US3240479A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1974-08-09 | 1975-02-08 | 1975-08-10 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-08-09 | 1979-02-08 | 1979-08-10 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-08-09 | 1983-02-08 | 1983-08-10 | $7700.00 | Window Closed / Lapsed |