US5104540A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Coated molten metal filters
Assignee: Corning Inc
•
Filing: 1990-06-22
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Granted: 1992-04-14
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Expires: 2010-06-22
Abstract
Abstract A molten metal filter is disclosed having a carbon or carbon-thermite coating that reduces thermal shock to the filter, and protects the filter from corrosion from the metal or components and impurities in the metal, and prevents metal from freezing in the filter. A molten metal assembly suitable for casting molten metal is disclosed which comprises a filter for molten metal and means for molten metal flow passage leading through the filter. The means have surfaces defining a molten metal path. The filter has a coating of carbon or carbon in intimate contact with a thermite material on the surfaces of the filter. A process is disclosed for filtering molten metal which comprises passing molten metal through the above described coated filter. <IMAGE>
Inventors
- 👤 J. Paul Day
- 👤 Timothy V. Johnson
- 👤 Ronald D. Quinn
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 14:44
CPC Classifications
B; B01; B01D; B01D39/00; B01D39/14; B01D39/20; B01D39/2027; B01D39/10; B01D39/12; B01D39/2051; B01D39/2055; B01D39/2058; B01D39/2068; B01D39/2093; C; C22; C22B; C22B9/00; C22B9/02; C22B9/023; B01D2239/00; B01D2239/04; B01D2239/0471; B01D2239/0478; Y; Y02; Y02P; Y02P10/00; Y02P10/20; Y10; Y10T; Y10T428/00; Y10T428/24; Y10T428/24149; Y10T428/249921; Y10T428/249953; Y10T428/249987; Y10T428/30; Y10T428/31504; Y10T428/31678
Claims Analysis
Total Claims: 14
Claim 1
Independent Claim
21 words
A molten filter having a coating of carbon in intimate contact with a thermite material on the surfaces of said filter.
Claim 2
Dependent Claim
21 words
A molten filter having a coating of carbon in intimate contact with a thermite material on the surfaces of said filter.
Claim 3
Dependent Claim
31 words
A molten metal filter of claim 1 wherein said coating is present on said filter in the form of a coating of said carbon over a coating of said thermite material.
Claim 4
Dependent Claim
30 words
A molten metal filter of claim 1 wherein said coating is present on said filter in the form of a coating of said thermite over a coating of said carbon.
Claim 5
Dependent Claim
31 words
A molten metal filter of claim 1 wherein said coating is present on said filter in the form of a single coating of a mixture of said carbon and said thermite.
Claim 6
Dependent Claim
17 words
A molten metal filter of claim 1 wherein the structure of said filter is a foamed structure.
Claim 7
Dependent Claim
39 words
A molten metal filter of claim 1 wherein the structure of said filter is a cellular structure wherein the substrate of said filter is made of material selected from the group consisting of ceramic materials, metals, and combinations thereof.
Claim 8
Dependent Claim
18 words
A molten metal filter of claim 1 wherein the structure of said filter is porous walled honeycomb shaped.
Claim 9
Dependent Claim
18 words
A molten metal filter of claim 7 wherein the substrate of said filter is made of ceramic material.
Claim 10
Dependent Claim
56 words
An assembly suitable for casting molten metal, said assembly comprising a filter for molten metal and means for molten metal flow passage leading through said filter, said means having surfaces defining a molten metal path, and said filter having a coating of carbon in intimate contact with a thermite material on the surfaces of said filter.
Claim 11
Dependent Claim
56 words
An assembly suitable for casting molten metal, said assembly comprising a filter for molten metal and means for molten metal flow passage leading through said filter, said means having surfaces defining a molten metal path, and said filter having a coating of carbon in intimate contact with a thermite material on the surfaces of said filter.
Claim 12
Dependent Claim
34 words
An assembly of claim 9 wherein said assembly is a mold assembly having one or more mold cavities into which said molten metal flow path leads and into which said molten metal is cast.
Claim 13
Dependent Claim
19 words
A process for filtering molten metal, said process comprising passing said molten metal through the filter of claim 1.
Claim 14
Dependent Claim
11 words
A process of claim 11 wherein said molten metal is steel.
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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) | 1995-04-14 | 1995-10-14 | 1996-04-14 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1999-04-14 | 1999-10-14 | 2000-04-14 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2003-04-14 | 2003-10-14 | 2004-04-14 | $7700.00 | Window Closed / Lapsed |