US4975191A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Ceramic foam filter
Assignee: Selee Corp
•
Filing: 1989-06-26
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Granted: 1990-12-04
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Expires: 2009-06-26
Abstract
Abstract An improved ceramic foam filter for use in filtering molten metal prepared from a ceramic slurry containing silicon carbide and a colloidal silica binder. The filter has a solids content of at least 50% silicon carbide and at least 3% of silica.
Inventors
- 👤 Jerry W. Brockmeyer
- 👤 Leonard S. Aubrey
- 👤 James E. Dore
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 23:56
CPC Classifications
B; B01; B01D; B01D39/00; B01D39/14; B01D39/20; B01D39/2068; B01D39/2093; B22; B22D; B22D11/00; B22D11/10; B22D11/11; B22D11/116; B22D11/119; C; C04; C04B; C04B38/00; C04B38/06; C04B38/0615; C22; C22B; C22B9/00; C22B9/02; C22B9/023; Y; Y02; Y02P; Y02P10/00; Y02P10/20
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
107 words
A cermic foam filter for use in filtering molten metal which comprises a filter body prepared from a ceramic slurry composition containing silicon carbide and a colloidal silica binder wherein said composition has a solids content of at least 50% silicon carbide and at least 3% silica, said filter body having an open cell structure with a plurality of interconnected voids surrounded by a web of said ceramic and a solids content of silicon carbide and silica in an amount such that said filter body is readily primable as a result of the wetting effect of the colloidal silica in the slurry and possesses improved thermal properties.
Claim 2
Dependent Claim
107 words
A cermic foam filter for use in filtering molten metal which comprises a filter body prepared from a ceramic slurry composition containing silicon carbide and a colloidal silica binder wherein said composition has a solids content of at least 50% silicon carbide and at least 3% silica, said filter body having an open cell structure with a plurality of interconnected voids surrounded by a web of said ceramic and a solids content of silicon carbide and silica in an amount such that said filter body is readily primable as a result of the wetting effect of the colloidal silica in the slurry and possesses improved thermal properties.
Claim 3
Dependent Claim
13 words
A filter according to claim 1 wherein the silica solids contained is 3-15%.
Claim 4
Dependent Claim
8 words
A filter according to claim 1 including alumina.
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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) | 1993-12-03 | 1994-06-04 | 1994-12-04 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1997-12-03 | 1998-06-04 | 1998-12-04 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2001-12-03 | 2002-06-04 | 2002-12-04 | $7700.00 | Window Closed / Lapsed |