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US3703278A Expired / Lapsed US ⏱️ 0.0 years remaining

Furnace for sintering powder

Assignee: ABB Norden Holding AB
•
Filing: 1971-07-09
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Granted: 1972-11-21
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Expires: 1991-07-09
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Abstract

Abstract Sintered bodies are formed from powder material by sintering a body produced from a powder at atmospheric pressure or below and at such a temperature that the powder grains adhere to each other and thereafter isostatically hot pressing the sintered bodies to high density in a furnace containing an inert atmosphere. The powder may contain hard metal particles such as metal carbides and a binder of an iron group metal. The furnace is formed by a cylindrical pressure chamber with a high pressure cylinder and end closures projecting into the cylinder. A furnace chamber is arranged in the pressure chamber and has heating windings and an insulating lid and bottom. One end closure of the pressure chamber has an annular part with members sealing against the cylinder and a valve plate covering the opening of the annular part. A vacuum conduit is provided which can be sealingly connected to the annular part and which includes projecting members for separating the valve plate and the annular part when the conduit is placed in operative position.

Inventors

  • 👤 Sven-Erik Isaksson

Bibliographic Details

Application Number —
Jurisdiction US
Data Source google_patents
Last Synchronized 2026-11-06 04:58
CPC Classifications
B; B30; B30B; B30B11/00; B30B11/001; B30B11/002; B22; B22F; B22F3/00; B22F3/12; B22F3/14; B22F3/15; C; C04; C04B; C04B33/00; C04B33/32; C04B33/326

Claims Analysis

Total Claims: 4
Claim 1
Independent Claim 170 words
Furnace for performing vacuum sintering and isostatic hot pressing of powder bodies, comprising a cylindrical pressure chamber (2) having a high pressure cylinder (10,11,12), end closures (13,50,55) projecting into said cylinder, means (1) to taking up axial forces effected by a pressure medium on the end closures (13,50,55), a furnace chamber (15) arranged in the pressure chamber and having heating means (47), insulation surrounding the furnace chamber in the form of a sleeve (17) having an insulating lid (25) and bottom (60,61,62), in which one end closure (50, 55) of the pressure chamber is shaped with an annular part (50) having members (51) sealing against the cylinder (10,11,12) and having a valve plate (55) covering the opening of the annular part (50), sealing members (56) between the annular part (50) and the valve plate (55), a vacuum conduit (70) which can be sealingly connected to the annular part (50) of the end closure, and means to separate the valve plate (55) and the annular part (50) of the end closure.
Claim 2
Dependent Claim 170 words
Furnace for performing vacuum sintering and isostatic hot pressing of powder bodies, comprising a cylindrical pressure chamber (2) having a high pressure cylinder (10,11,12), end closures (13,50,55) projecting into said cylinder, means (1) to taking up axial forces effected by a pressure medium on the end closures (13,50,55), a furnace chamber (15) arranged in the pressure chamber and having heating means (47), insulation surrounding the furnace chamber in the form of a sleeve (17) having an insulating lid (25) and bottom (60,61,62), in which one end closure (50, 55) of the pressure chamber is shaped with an annular part (50) having members (51) sealing against the cylinder (10,11,12) and having a valve plate (55) covering the opening of the annular part (50), sealing members (56) between the annular part (50) and the valve plate (55), a vacuum conduit (70) which can be sealingly connected to the annular part (50) of the end closure, and means to separate the valve plate (55) and the annular part (50) of the end closure.
Claim 3
Dependent Claim 44 words
Furnace according to claim 1, in which in that the connecting conduit (70) for the vacuum projects into the annular opening of the end closure and constitutes the means to separate the valve plate (55) from the annular part (50) of the end closure.
Claim 4
Dependent Claim 30 words
Furnace according to claim 2, in which the annular part (50) of the end closure can be lowered in order to separate this part (50) from the valve plate (55).

References Cited (Backward Citations)

US3571850A Cited

USPTO Annuity & Maintenance Windows

Annuity Stage Window Opens Payment Deadline Surcharge Period Until Estimated Fee Status
3.5 Years (Year 4) 1975-11-21 1976-05-22 1976-11-21 $2000.00 Window Closed / Lapsed
7.5 Years (Year 8) 1979-11-21 1980-05-22 1980-11-21 $3760.00 Window Closed / Lapsed
11.5 Years (Year 12) 1983-11-21 1984-05-22 1984-11-21 $7700.00 Window Closed / Lapsed

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