US4258099A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Cordierite, alumina, silica porous ceramic bodies coated with an activated alumina layer
Assignee: Bridgestone Corp
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Filing: 1979-10-22
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Granted: 1981-03-24
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Expires: 1999-10-22
Abstract
Abstract A ceramic porous body useful as a filtering material for molten metal is disclosed. The ceramic porous body, consisting essentially of cordierite, alumina and silica, is formed by covering surfaces of cell strands of a ceramic porous body skeleton having a bulk specific gravity of 0.25-0.55 with 3-40% by weight per the weight of the skeleton of an activated alumina layer and has an average diameter of interconnected voids of 0.3-5.0 mm, a pressure loss of 0.3-30.0 mm as a water-gauge pressure when passing air through the body of 1 cm thick at a rate of 1 m/sec., a microsurface area of not less than 10 m2/g and a porosity of 75-95%.
Inventors
- 👤 Tsuneaki Narumiya
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 22:07
CPC Classifications
B; B01; B01D; B01D39/00; B01D39/14; B01D39/20; B01D39/2068; B01D39/2093; C; C04; C04B; C04B38/00; C04B38/06; C04B38/0615; C22; C22B; C22B9/00; C22B9/02; C22B9/023; Y; Y02; Y02P; Y02P10/00; Y02P10/20; Y10; Y10T; Y10T428/00; Y10T428/249921; Y10T428/249953
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
134 words
A ceramic porous body useful as a filtering material for molten metal and having a three-dimensional network cellular structure with a plurality of interconnected voids without clogging in any direction, characterized in that said ceramic porous body is formed by covering surfaces of cell strands of a ceramic porous body skeleton, consisting essentially of cordierite, alumina, and silica, having a bulk specific gravity of 0.25-0.55 with 3-40% by weight per the weight of the skeleton of an activated alumina layer and having an average diameter of said interconnected voids of 0.3-5.0 mm, a pressure loss of 0.3-30.0 mm as a water-gauge pressure when passing air through the body of 1 cm thick at a rate of 1 m/sec., a microsurface area of not less than 10 m 2 /g, and a porosity of 75-95%.
Claim 2
Dependent Claim
134 words
A ceramic porous body useful as a filtering material for molten metal and having a three-dimensional network cellular structure with a plurality of interconnected voids without clogging in any direction, characterized in that said ceramic porous body is formed by covering surfaces of cell strands of a ceramic porous body skeleton, consisting essentially of cordierite, alumina, and silica, having a bulk specific gravity of 0.25-0.55 with 3-40% by weight per the weight of the skeleton of an activated alumina layer and having an average diameter of said interconnected voids of 0.3-5.0 mm, a pressure loss of 0.3-30.0 mm as a water-gauge pressure when passing air through the body of 1 cm thick at a rate of 1 m/sec., a microsurface area of not less than 10 m 2 /g, and a porosity of 75-95%.
Claim 3
Dependent Claim
53 words
A ceramic porous body as claimed in claim 1, wherein said ceramic porous body skeleton is formed by adhering a ceramic slurry to an open-cell, flexible polyurethane foam as a substrate and firing it to remove the foam by carbonization and has substantially the same skeletal reticulated structure as that of the foam.
Claim 4
Dependent Claim
16 words
A ceramic porous body as claimed in claim 1, wherein said activated alumina layer is γ-alumina.
References Cited (Backward Citations)
US3897221A
Cited
US4004933A
Cited
US3950175A
Cited
US3893917A
Cited
US3947363A
Cited
US4001028A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1984-03-23 | 1984-09-22 | 1985-03-24 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1988-03-23 | 1988-09-22 | 1989-03-24 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1992-03-23 | 1992-09-22 | 1993-03-24 | $7700.00 | Window Closed / Lapsed |