Patent US4765833A successfully refreshed from Google Patents.
US4765833A
Expired / Lapsed
US
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Porous ceramic structure and method of filtering aluminum
Assignee: Bridgestone Corp
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Filing: 1985-11-08
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Granted: 1988-08-23
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Expires: 2005-11-08
Abstract
Abstract A porous ceramic structure suitable for use as a filter for molten metal, in which a porous ceramic body having pores capable of passing a fluid therethrough is covered with a metal layer over the wall surface of the pores such that a fluid may flow through the pores while in contact with the metal layer. The filtering efficiency can be improved due to the increased wettability between the ceramic filter and the molten metal.
Inventors
- 👤 Tsuneaki Narumiya
- 👤 Tomio Oyachi
- 👤 Yasuhiro Iino
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 14:06
CPC Classifications
C; C22; C22B; C22B21/00; C22B21/06; C22B21/066; B; B01; B01D; B01D39/00; B01D39/14; B01D39/20; B01D39/2068; B01D39/2093; C04; C04B; C04B41/00; C04B41/45; C04B41/50; C04B41/51; C22B9/00; C22B9/02; C22B9/023; B01D2239/00; B01D2239/04; B01D2239/0442; B01D2239/0471; B01D2239/0478; B01D2239/12; B01D2239/1208; B01D2239/1216; Y; Y02; Y02P; Y02P10/00; Y02P10/20
Claims Analysis
Total Claims: 10
Claim 1
Independent Claim
78 words
A porous ceramic structure suitable for use as a filter for molten aluminum comprising a porous ceramic body having pores capable of passing the molten aluminum therethrough, and a formed, plated copper layer, having a melting point higher than that of the molten aluminum to be filtered, covering the entire surface of said pores such that said molten aluminum may flow through said pores while in contact with said formed, plated copper layer without melting said copper layer.
Claim 2
Dependent Claim
78 words
A porous ceramic structure suitable for use as a filter for molten aluminum comprising a porous ceramic body having pores capable of passing the molten aluminum therethrough, and a formed, plated copper layer, having a melting point higher than that of the molten aluminum to be filtered, covering the entire surface of said pores such that said molten aluminum may flow through said pores while in contact with said formed, plated copper layer without melting said copper layer.
Claim 3
Dependent Claim
22 words
The structure as defined in claim 1, wherein the thickness of said formed plated copper layer is from 0.05 to 30 μm.
Claim 4
Dependent Claim
16 words
The structure as defined in claim 1 wherein said copper layer is formed by electroless plating.
Claim 5
Dependent Claim
18 words
The structure as defined in claim 1 wherein copper layer is formed by electroless plating, followed by electroplating.
Claim 6
Dependent Claim
41 words
The structure as defined in claim 1, wherein said porous ceramic body comprises a ceramic foam of a reticulate cell structure having three-dimensional interconnected open cells, and said formed, plated copper layer is formed covering the surface of the skeleton lattice.
Claim 7
Dependent Claim
85 words
The structure as defined in claim 5, wherein the ceramic porous foam has an apparent specific gravity of from 0.3 to 0.6, the average diameter of an interconnected open cells of from 0.3 to 5 mm after forming said formed plated copper layer on the surface of the skeleton lattice thereof, a pressure loss of from 0.3 to 30 mmAq for passing through the 1 cm thickness at the wind flow rate of 1 m per sec, and a porosity of from 75 to 90%.
Claim 8
Dependent Claim
33 words
The structure as defined in claim 5 wherein said porous ceramic foam is prepared by applying a ceramic slurry to a cell membrane free reticulate flexible polyurethane foam and then sintering the same.
Claim 9
Dependent Claim
18 words
The structure as defined in claim 5, wherein said material for said porous ceramic foam is cordierite material.
Claim 10
Dependent Claim
20 words
A method for filtering molten aluminum which comprises passing said molten aluminum through the porous ceramic structure of claim 1.
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) | 1991-08-23 | 1992-02-22 | 1992-08-23 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1995-08-23 | 1996-02-22 | 1996-08-23 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1999-08-23 | 2000-02-22 | 2000-08-23 | $7700.00 | Window Closed / Lapsed |