Patent US5223138A successfully refreshed from Google Patents.
US5223138A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Reinforced ceramic filter candle and method of making same
Assignee: Universal Porosics Inc
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Filing: 1991-02-04
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Granted: 1993-06-29
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Expires: 2011-02-04
Abstract
Abstract A ceramic filter candle is formed by a skeleton of ceramic fibers and spaced apart metallic perforate reinforcing members bonded together by means of a ceramic binder and a porous ceramic coating material which partially fills the interstices between the fibers and the perforations in the reinforcing members. The candle is manufactured in a vacuum forming process wherein an aqueous slurry of the ceramic fibers and a ceramic binder is drawn through a generally cylindrical mold surface and the preformed tubular reinforcing members to deposit the fibers on the mold surface and over the reinforcing members. The fibers and the reinforcing members are subsequently coated with a ceramic material.
Inventors
- 👤 James F. Zievers
- 👤 Elizabeth C. Zievers
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 10:43
CPC Classifications
B; B01; B01D; B01D39/00; B01D39/14; B01D39/20; B01D39/2068; B01D39/2082; B01D39/2086; B28; B28B; B28B1/00; B28B1/26; B28B1/265; B28B1/52; B28B23/00; B28B23/02; Y; Y10; Y10S; Y10S55/00; Y10S55/05
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
106 words
A method of making a filter element, comprising the steps of positioning a perforate reinforcing member in proximity to a perforate mold surface, forming over said reinforcing member and said mold surface a skeletal member of refractory ceramic fibers bonded together and to said reinforcing member by drawing an aqueous slurry of a ceramic binder and said fibers onto said mold surface, and heat treating the formed part to dry the binder, then coating said skeletal member and said reinforcing member with a ceramic coating material in liquid form, and then heat treating said skeletal member and said reinforcing member to dry said ceramic coating material.
Claim 2
Independent Claim
106 words
A method of making a filter element, comprising the steps of positioning a perforate reinforcing member in proximity to a perforate mold surface, forming over said reinforcing member and said mold surface a skeletal member of refractory ceramic fibers bonded together and to said reinforcing member by drawing an aqueous slurry of a ceramic binder and said fibers onto said mold surface, and heat treating the formed part to dry the binder, then coating said skeletal member and said reinforcing member with a ceramic coating material in liquid form, and then heat treating said skeletal member and said reinforcing member to dry said ceramic coating material.
Claim 3
Dependent Claim
29 words
The method set forth in claim 1 wherein said liquid ceramic coating material is selected from the group consisting of alumina gel, alpha aluminum, colloidal aluminum and colloidal silica.
Claim 4
Dependent Claim
80 words
A ceramic filter element comprising in combination a tubular ceramic skeletal member formed of randomly disposed ceramic fibers bonded together to form a porous, unitary mass, and first and second tubular, perforate reinforcing members disposed in mutually spaced apart longitudinal relationship with and concentrically disposed said tubular skeletal member, the fibers of said skeletal member and said reinforcing members being bonded together by a ceramic binder, and said skeletal ember and said reinforcing member being encased in a ceramic material.
Claim 5
Dependent Claim
80 words
A ceramic filter element comprising in combination a tubular ceramic skeletal member formed of randomly disposed ceramic fibers bonded together to form a porous, unitary mass, and first and second tubular, perforate reinforcing members disposed in mutually spaced apart longitudinal relationship with and concentrically disposed said tubular skeletal member, the fibers of said skeletal member and said reinforcing members being bonded together by a ceramic binder, and said skeletal ember and said reinforcing member being encased in a ceramic material.
Claim 6
Dependent Claim
25 words
The ceramic filter element according to claim 3, wherein said ceramic material is selected from the group consisting of alpha aluminum, alumina gel, and silica.
Claim 7
Dependent Claim
74 words
The ceramic filter element according to claim 4, wherein said filter element is in the form of a hollow cylinder having a closed end and an open end, an integral external annular flange at said open end, said first perforate metal reinforcing member being embedded in said filter element in proximity to said external flange, and said second perforate metal reinforcing member being embedded in said filter element in proximity to said closed end.
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) | 1996-06-28 | 1996-12-28 | 1997-06-29 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 2000-06-28 | 2000-12-28 | 2001-06-29 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2004-06-28 | 2004-12-28 | 2005-06-29 | $7700.00 | Window Closed / Lapsed |