US3871630A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Apparatus for sintering pressed powder elements containing hydrocarbons
Assignee: Leybold Heraeus Verwaltung GmbH
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Filing: 1973-03-12
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Granted: 1975-03-18
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Expires: 1993-03-12
Abstract
Abstract An arrangement for sintering under vacuum pressed powder elements which contain hydrocarbons. The hydrocarbons are driven out under lower pressure and higher temperature than ambient conditions. A flow of cleansing gas is then directed between the periphery of the pressed powder elements and the device for separating the hydrocarbons. This process step is carried out at a temperature between 100* and 800*C., while the pressure is below atmospheric. The sintering operation is then carried out after the hydrocarbons have been substantially driven out.
Inventors
- 👤 Erwin Wanetzky
- 👤 Gerhard Kuklok
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 14:28
CPC Classifications
B; B22; B22F; B22F3/00; B22F3/003; B22F3/10
Claims Analysis
Total Claims: 13
Claim 1
Independent Claim
79 words
A VACUUM-FURNACE ARRANGEMENT FOR SINTERING PRESSED POWDERED ELEMENTS CONTAINING HYDROCARBONS UNDER VACUUM AND ELEVATED TEMPERATURES, COMPRISING IN COMBINATION A VACUUM TIGHT FURNACE HOUSING WITH HEATING MEANS; SUPPORT MEANS WITHIN SAID HOUSING FOR SUPPORTING SAID ELEMENTS; FIRST PUMPING MEANS CONNECTED TO SAID HOUSING FOR PRODUCING A VACUUM WITHIN SAID HOUSING; SEPARATING MEANS FOR SEPARATING SAID HYDROCARBONS; CYCLE OF FLOW INTERCONNECTING MEANS FOR SAID HOUSING AND SAID SEPARATING MEANS; AND SECOND PUMPING MEANS WITHIN SAID CYCLE OF FLOW INTERCONNECTING MEANS FOR
Claim 2
Dependent Claim
79 words
A VACUUM-FURNACE ARRANGEMENT FOR SINTERING PRESSED POWDERED ELEMENTS CONTAINING HYDROCARBONS UNDER VACUUM AND ELEVATED TEMPERATURES, COMPRISING IN COMBINATION A VACUUM TIGHT FURNACE HOUSING WITH HEATING MEANS; SUPPORT MEANS WITHIN SAID HOUSING FOR SUPPORTING SAID ELEMENTS; FIRST PUMPING MEANS CONNECTED TO SAID HOUSING FOR PRODUCING A VACUUM WITHIN SAID HOUSING; SEPARATING MEANS FOR SEPARATING SAID HYDROCARBONS; CYCLE OF FLOW INTERCONNECTING MEANS FOR SAID HOUSING AND SAID SEPARATING MEANS; AND SECOND PUMPING MEANS WITHIN SAID CYCLE OF FLOW INTERCONNECTING MEANS FOR
Claim 3
Dependent Claim
30 words
The arrangement as defined in claim 1 wherein said separating means comprises a series interconnected arrangement of a surface heat exchanger; expansion means; a solids particle separator; and blowing means.
Claim 4
Dependent Claim
16 words
The arrangement as defined in claim 2, wherein said solids particle separator comprises a cyclone separator.
Claim 5
Dependent Claim
40 words
The arrangement as defined in claim 3 wherein said expansion means is directed into said solids particle separator means so that the expanded flow from said expansion means is substantially tangential to the wall of said solids particle separator means.
Claim 6
Dependent Claim
17 words
The arrangement as defined in claim 3 wherein said cyclone separator has interior walls with irregular surface.
Claim 7
Dependent Claim
29 words
The arrangement as defined in claim 4 including valve means in said flow interconnecting means and in front of said separating means and in back of said separating means.
Claim 8
Dependent Claim
45 words
The arrangement as defined in claim 1 wherein said heating means comprises a heating cylinder substantially surrounding said elements; and an inner housing between said heating cylinder and said support means, said inner housing having inlet and outlet openings communicating with said flow interconnecting means.
Claim 9
Dependent Claim
26 words
The arrangement as defined in claim 7 wherein the wall of said inner housing has openings in the region of said support means for said elements.
Claim 10
Dependent Claim
39 words
The arrangement as defined in claim 7 wherein said interconnecting means has an outlet opening in the portion emerging from said furnace housing, said flow interconnecting means communicating with the space between said furnace housing and said heating cylinder.
Claim 11
Dependent Claim
53 words
The arrangement as defined in claim 1, including vacuum line means between said first pumping means and said furnace housing; valve means in said vacuum line, pipe line means in said cycle of flow interconnecting means to said vacuum line behind said valve means in said vacuum line when viewed from said housing.
Claim 12
Dependent Claim
105 words
An arrangement for sintering pressed powdered elements containing hydrocarbons under vacuum comprising, in combination, a vacuum tight furnace housing with heating means; support means within said housing for supporting said elements; pumping means connected to said housing for producing a vacuum within said housing; separating means for separating said hydrocarbons; flow interconnecting means between said housing and said separating means, said separating means comprising a series interconnected arrangement of a surface heat exchanger, expansion means, a solids particle separator, and blowing means; and auxiliary heat exchanging means and valve means connected in parallel with said surface heat exchanger, expansion means and solids particle separator means.
Claim 13
Dependent Claim
105 words
An arrangement for sintering pressed powdered elements containing hydrocarbons under vacuum comprising, in combination, a vacuum tight furnace housing with heating means; support means within said housing for supporting said elements; pumping means connected to said housing for producing a vacuum within said housing; separating means for separating said hydrocarbons; flow interconnecting means between said housing and said separating means, said separating means comprising a series interconnected arrangement of a surface heat exchanger, expansion means, a solids particle separator, and blowing means; and auxiliary heat exchanging means and valve means connected in parallel with said surface heat exchanger, expansion means and solids particle separator means.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1978-03-17 | 1978-09-16 | 1979-03-18 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-03-17 | 1982-09-16 | 1983-03-18 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-03-17 | 1986-09-16 | 1987-03-18 | $7700.00 | Window Closed / Lapsed |