Patent US2934784A successfully refreshed from Google Patents.
Patent US4925631A successfully refreshed from Google Patents.
US4925631A
Expired / Lapsed
US
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Method of casting a hopcalite filter and cast ceramic fiber-hopcalite
Assignee: Avox Systems Inc
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Filing: 1988-09-26
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Granted: 1990-05-15
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Expires: 2008-09-26
Abstract
Abstract A method of making a cast hopcalite filter. The filter is formed by adding to "green" hopcalite a given weight of ceramic fibers. Additional water may also be added as required. This mixture is blended briefly in a high speed blender and then poured into a mold. Water is drained by vacuum through a filter paper in the bottom of the mold, preferably with the aid of a vacuum. The wet preform is then placed in a high temperature (600° F. to 650° F. ) oven for approximately 90 minutes for calcining. In this process the basic catalyst material saturates the fiber matrix before drying and transformation into its final chemical state.
Inventors
- 👤 Van N. Harwood, Jr.
- 👤 Joseph F. Wojtasik
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 19:33
CPC Classifications
B; B01; B01J; B01J23/00; B01J23/70; B01J23/76; B01J23/84; B01J23/889; B01J23/8892; A; A62; A62B; A62B19/00; B01D; B01D39/00; B01D39/14; B01D39/20; B01D39/2068; B01D39/2082; B01D39/2086; B01D39/2093; C; C04; C04B; C04B35/00; C04B35/01; C04B35/45; C04B35/71; C04B35/78; C04B35/80; C04B38/00; C04B2235/00; C04B2235/02; C04B2235/30; C04B2235/32; C04B2235/3262; C04B2235/50; C04B2235/52; C04B2235/5208; C04B2235/5216; C04B2235/522; C04B2235/5228; C04B2235/60; C04B2235/602; C04B2235/6027
Claims Analysis
Total Claims: 10
Claim 1
Independent Claim
113 words
A method of making a cast filter comprising the following steps: providing green hopcalite precipitate comprised of CuCO 3 Cu(OH) 2 and MnCO 3 ; adding to the green hopcalite a given weight by percentage of ceramic fibers and water to make up a slurry wherein said fibers are added in an amount sufficient to hold a subsequently molded product together; blending the above slurry briefly in a high speed blender; introducing the resultant product into a mold of desired cross sectional shape and size to form a cast filter; draining the water from the above product; and calcining the above product at a temperature of approximately 600°-650° F. for approximately 90 minutes.
Claim 2
Independent Claim
113 words
A method of making a cast filter comprising the following steps: providing green hopcalite precipitate comprised of CuCO 3 Cu(OH) 2 and MnCO 3 ; adding to the green hopcalite a given weight by percentage of ceramic fibers and water to make up a slurry wherein said fibers are added in an amount sufficient to hold a subsequently molded product together; blending the above slurry briefly in a high speed blender; introducing the resultant product into a mold of desired cross sectional shape and size to form a cast filter; draining the water from the above product; and calcining the above product at a temperature of approximately 600°-650° F. for approximately 90 minutes.
Claim 3
Dependent Claim
23 words
The method as set forth in claim 1 wherien the drained blended slurry is initially dried by room temperature air prior to calcining.
Claim 4
Dependent Claim
23 words
The method as set forth in claim 1 wherein the water is drained from the blended slurry with the aid of a vacuum.
Claim 5
Dependent Claim
17 words
The method as set forth in claim 1 wherein the ceramic fibers have a high surface area.
Claim 6
Dependent Claim
20 words
The method as set forth in claim 1 wherein the ceramic fibers are formed principally from aluminum and silicon oxides.
Claim 7
Dependent Claim
29 words
The method as set forth in claim 1 wherein the mold is the container for the filter and the filter is left in place for calcining and ultimate use.
Claim 8
Dependent Claim
20 words
The method as set forth in claim 1 wherein the filter preform is removed from the molds prior to calcining.
Claim 9
Dependent Claim
12 words
The cast filter made by the method set forth in claim 6.
Claim 10
Dependent Claim
12 words
The cast filter made by the method set forth in claim 7.
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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) | 1993-05-14 | 1993-11-13 | 1994-05-15 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1997-05-14 | 1997-11-13 | 1998-05-15 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2001-05-14 | 2001-11-13 | 2002-05-15 | $7700.00 | Window Closed / Lapsed |