US3907579A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Manufacture of porous ceramic materials
Assignee: Foseco International Ltd
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Filing: 1972-12-29
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Granted: 1975-09-23
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Expires: 1992-12-29
Abstract
Abstract Permeable ceramic structures are made by impregnating an organic foam with a slurry of finely divided ceramic material, the slurry containing a high concentration of anti-foaming agent, and drying and firing the so-impregnated foam.
Inventors
- 👤 Frank Ernest George Ravault
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 12:46
CPC Classifications
C; C04; C04B; C04B38/00; C04B38/06; C04B38/0615
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
47 words
IN THE METHOD OF MAKING A PERMEABLE CERAMIC STRUCTURE WHICH COMPRISES IMPREGNATING AN ORGANIC FOAM WITH A SLURRY OF A FINELY DIVIDED CERAMIC MATERIAL, AND DRYING AND FIRING THE SO-IMPREGNATED FOAM, THE IMPROVEMENT WHICH COMPRISES INCLUDING AT LEAST 0.1% BY WEIGHT OF ANTI-FOAMING AGENT IN THE SLURRY.
Claim 2
Dependent Claim
47 words
IN THE METHOD OF MAKING A PERMEABLE CERAMIC STRUCTURE WHICH COMPRISES IMPREGNATING AN ORGANIC FOAM WITH A SLURRY OF A FINELY DIVIDED CERAMIC MATERIAL, AND DRYING AND FIRING THE SO-IMPREGNATED FOAM, THE IMPROVEMENT WHICH COMPRISES INCLUDING AT LEAST 0.1% BY WEIGHT OF ANTI-FOAMING AGENT IN THE SLURRY.
Claim 3
Dependent Claim
22 words
The method of claim 1 wherein the anti-foaming agent is selected from the class consisting of silicones and high molecular weight alcohols.
Claim 4
Dependent Claim
25 words
The method of claim 1 wherein the anti-foaming agent is a mixture of at least one silicone and at least one high molecular weight alcohol.
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) | 1978-09-22 | 1979-03-24 | 1979-09-23 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-09-22 | 1983-03-24 | 1983-09-23 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-09-22 | 1987-03-24 | 1987-09-23 | $7700.00 | Window Closed / Lapsed |