Patent US4287098A successfully refreshed from Google Patents.
US4287098A
Expired / Lapsed
US
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Process for the production of exhaust gas filters
Assignee: Texaco Ltd
•
Filing: 1980-02-26
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Granted: 1981-09-01
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Expires: 2000-02-26
Abstract
Abstract A large scale method is provided for the production of exhaust and industrial gas filters comprising aluminium oxide produced by the decomposition of alumina hydrate deposited on a substrate. A plurality of substrates are mounted on a stand, immersed in an alkali metal aluminate solution while the stand is subjected to motion through the solution, thereby causing the solution to flow over and through the substrates while alumina hydrate is deposited on them.
Inventors
- 👤 Frank Farnworth
- 👤 Michael H. Clubley
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 21:25
CPC Classifications
C; C23; C23C; C23C18/00; C23C18/02; C23C18/12; C23C18/1204; C23C18/1208; C23C18/1216; B; B01; B01D; B01D53/00; B01D53/34; B01D53/92; B01D53/94; B01D53/9445; B01D53/945; Y; Y02; Y02T; Y02T10/00; Y02T10/10; Y02T10/12
Claims Analysis
Total Claims: 22
Claim 1
Independent Claim
111 words
A method for the production of exhaust gas filters comprising aluminum oxide produced by the decomposition of alumina hydrate deposited on a substrate contained within a metal casing, in which said alumina hydrate is deposited from an alkali metal aluminate solution, which comprises mounting a plurality of said substrates upon a stand therefor, immersing said stand in said alkali metal aluminate solution, and subjecting said stand to vertical or horizontal reciprocating motion or rotating motion or a vector combination of said motions through said alkali metal aluminate solution whereby said alkali metal aluminate solution is caused to flow over and through said substrates while alumina hydrate is deposited on said substrates.
Claim 2
Independent Claim
111 words
A method for the production of exhaust gas filters comprising aluminum oxide produced by the decomposition of alumina hydrate deposited on a substrate contained within a metal casing, in which said alumina hydrate is deposited from an alkali metal aluminate solution, which comprises mounting a plurality of said substrates upon a stand therefor, immersing said stand in said alkali metal aluminate solution, and subjecting said stand to vertical or horizontal reciprocating motion or rotating motion or a vector combination of said motions through said alkali metal aluminate solution whereby said alkali metal aluminate solution is caused to flow over and through said substrates while alumina hydrate is deposited on said substrates.
Claim 3
Dependent Claim
36 words
A method as claimed in claim 1 wherein the alkali metal aluminate solution is obtained by dissolving an aluminum source selected from aluminum metal, alumina hydrate, bauxite and bauxitic clay, in an alkali metal hydroxide solution.
Claim 4
Dependent Claim
19 words
A method as claimed in claim 1 wherein said stand is reciprocated vertically within said alkali metal aluminate solution.
Claim 5
Dependent Claim
17 words
A method as claimed in claim 2 wherein said aluminum metal is at least about 99% pure.
Claim 6
Dependent Claim
17 words
A method as claimed in claim 1 wherein said alkali metal aluminate solution is sodium aluminate solution.
Claim 7
Dependent Claim
31 words
A method as claimed in claim 5 wherein said sodium aluminate solution has a free soda strength (as Na 2 O) of from about 60 to about 300 grams per liter.
Claim 8
Dependent Claim
29 words
A method as claimed in claim 6 wherein said sodium aluminate solution has an Al 2 O 3 concentration of from about 78 to about 500 grams per liter.
Claim 9
Dependent Claim
33 words
A method as claimed in claim 5 wherein said sodium aluminate solution exhibits an initial weight ratio of Al 2 O 3 to Na 2 O of from about 1.3:1 to about 1.67:1.
Claim 10
Dependent Claim
27 words
A method as claimed in claim 1 wherein said alumina hydrate is deposited on said metal wire at a temperature from about 60 to about 95° C.
Claim 11
Dependent Claim
121 words
In a method for the production of exhaust gas filters comprising aluminum oxide produced by the decomposition of alumina hydrate deposited on a substrate contained within a metal casing, in which said alumina hydrate is deposited from an alkali metal aluminate solution, by mounting a plurality of said substrates upon a stand therefor, immersing said stand in said alkali metal aluminate solution, and depositing alumina hydrate on said substrate, the improvement which comprises subjecting said stand to vertical or horizontal reciprocating motion or rotating motion or a vector combination of said motions through said alkali metal aluminate solution whereby said alkali metal aluminate solution is caused to flow over and through said substrates while alumina hydrate is deposited on said substrates.
Claim 12
Dependent Claim
121 words
In a method for the production of exhaust gas filters comprising aluminum oxide produced by the decomposition of alumina hydrate deposited on a substrate contained within a metal casing, in which said alumina hydrate is deposited from an alkali metal aluminate solution, by mounting a plurality of said substrates upon a stand therefor, immersing said stand in said alkali metal aluminate solution, and depositing alumina hydrate on said substrate, the improvement which comprises subjecting said stand to vertical or horizontal reciprocating motion or rotating motion or a vector combination of said motions through said alkali metal aluminate solution whereby said alkali metal aluminate solution is caused to flow over and through said substrates while alumina hydrate is deposited on said substrates.
Claim 13
Dependent Claim
36 words
A method as claimed in claim 10 wherein the alkali metal aluminate solution is obtained by dissolving an aluminum source selected from aluminum metal, alumina hydrate, bauxite and bauxitic clay in an alkali metal hydroxide solution.
Claim 14
Dependent Claim
19 words
A method as claimed in claim 10 wherein said stand is reciprocated vertically within said alkali metal aluminate solution.
Claim 15
Dependent Claim
17 words
A method as claimed in claim 11 wherein said aluminum metal is at least about 99% pure.
Claim 16
Dependent Claim
17 words
A method as claimed in claim 10 wherein said alkali metal aluminate solution is sodium aluminate solution.
Claim 17
Dependent Claim
31 words
A method as claimed in claim 14 wherein said sodium aluminate solution has a free soda strength (as Na 2 O) of from about 60 to about 300 grams per liter.
Claim 18
Dependent Claim
29 words
A method as claimed in claim 15 wherein said sodium aluminate solution has an Al 2 O 3 concentration of from about 78 to about 500 grams per liter.
Claim 19
Dependent Claim
33 words
A method as claimed in claim 14 wherein the sodium aluminate solution exhibits an initial weight ratio of Al 2 O 3 to Na 2 O of from about 1.3:1 to about 1.67:1.
Claim 20
Dependent Claim
27 words
A method as claimed in claim 10 wherein the alumina hydrate is deposited on the metal wire at a temperature from about 60 to about 95° C.
Claim 21
Independent Claim
183 words
A method for the production of exhaust gas filters comprising aluminum oxide produced by the decomposition of alumina hydrate deposited on a substrate contained within a metal casing, in which said alumina hydrate is deposited, at a temperature of from about 60 to about 95° C., from a sodium aluminate solution having a free soda strength (as Na 2 O) of from about 60 to about 300 grams per liter, an Al 2 O 3 concentration of from about 78 to about 500 grams per liter, and an initial weight ratio of from about 1.3:1 to about 1.67:1, said sodium aluminate solution being obtained by dissolving an aluminum source selected from aluminum metal at least about 99% pure, alumina hydrate, bauxite and bauxitic clay in a sodium hydroxide solution, which method comprises mounting a plurality of said substrates upon a stand therefore, immersing said stand in said sodium aluminate solution, and vertically reciprocating said stand through said alkali metal aluminate solution whereby said sodium aluminate solution is caused to flow over and through said substrates while alumina hydrate is deposited on said substrates.
Claim 22
Independent Claim
183 words
A method for the production of exhaust gas filters comprising aluminum oxide produced by the decomposition of alumina hydrate deposited on a substrate contained within a metal casing, in which said alumina hydrate is deposited, at a temperature of from about 60 to about 95° C., from a sodium aluminate solution having a free soda strength (as Na 2 O) of from about 60 to about 300 grams per liter, an Al 2 O 3 concentration of from about 78 to about 500 grams per liter, and an initial weight ratio of from about 1.3:1 to about 1.67:1, said sodium aluminate solution being obtained by dissolving an aluminum source selected from aluminum metal at least about 99% pure, alumina hydrate, bauxite and bauxitic clay in a sodium hydroxide solution, which method comprises mounting a plurality of said substrates upon a stand therefore, immersing said stand in said sodium aluminate solution, and vertically reciprocating said stand through said alkali metal aluminate solution whereby said sodium aluminate solution is caused to flow over and through said substrates while alumina hydrate is deposited on said substrates.
References Cited (Backward Citations)
US3231520A
Cited
US3362783A
Cited
USPTO Annuity & Maintenance Windows
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| 3.5 Years (Year 4) | 1984-08-31 | 1985-03-02 | 1985-09-01 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1988-08-31 | 1989-03-02 | 1989-09-01 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1992-08-31 | 1993-03-02 | 1993-09-01 | $7700.00 | Window Closed / Lapsed |