US5022991A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Thermite coated filter
Assignee: Corning Inc
•
Filing: 1988-09-08
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Granted: 1991-06-11
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Expires: 2008-09-08
Abstract
Abstract Thermite coatings are applied to molten metal filters and the environs, to produce longer lived filters that can be utilized in harsher environments. The coatings employ exothermic, redox, and combination reactions to produce the beneficial effects.
Inventors
- 👤 John P. Day
- 👤 Timothy V. Johnson
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 18:37
CPC Classifications
B; B01; B01D; B01D39/00; B01D39/14; B01D39/20; C; C22; C22B; C22B9/00; C22B9/02; C22B9/023; C23; C23C; C23C26/00; C23C30/00; B01D2239/00; B01D2239/04; B01D2239/0471; Y; Y02; Y02P; Y02P10/00; Y02P10/20; Y10; Y10T; Y10T428/00; Y10T428/24; Y10T428/24149
Claims Analysis
Total Claims: 21
Claim 1
Independent Claim
40 words
A molten metal filter comprising a substrate having a thermite coating thereon, said coating comprises reactants which will undergo reaction that has a negative free energy of reaction and is initiated by catalysis or heat communication with said thermite coating.
Claim 2
Dependent Claim
40 words
A molten metal filter comprising a substrate having a thermite coating thereon, said coating comprises reactants which will undergo reaction that has a negative free energy of reaction and is initiated by catalysis or heat communication with said thermite coating.
Claim 3
Dependent Claim
32 words
A molten metal filter comprising a substrate having a thermite coating thereon, said coating comprises inorganic oxidation-reduction reactants which will undergo reaction initiated by catalysis or heat communication with said thermite coating.
Claim 4
Dependent Claim
32 words
A molten metal filter comprising a substrate having a thermite coating thereon, said coating comprises inorganic oxidation-reduction reactants which will undergo reaction initiated by catalysis or heat communication with said thermite coating.
Claim 5
Dependent Claim
42 words
A molten metal filter comprising a substrate having a thermite coating thereon, said coating comprises inorganic oxidation-reduction reactants which will undergo reaction that has a negative free energy of reaction and is initiated by catalysis or heat communication with said thermite coating.
Claim 6
Dependent Claim
42 words
A molten metal filter comprising a substrate having a thermite coating thereon, said coating comprises inorganic oxidation-reduction reactants which will undergo reaction that has a negative free energy of reaction and is initiated by catalysis or heat communication with said thermite coating.
Claim 7
Dependent Claim
27 words
The filter of claim 1, 2, or 3 wherein said coating will react within itself, with the substrate, with the molten metal, or with a combination thereof.
Claim 8
Dependent Claim
43 words
The filter of claim 1, 2, or 3 wherein one of said reactants includes metal selected from the group consisting of lithium, mercury, palladium, silver, copper, lead, cadmium, cobalt, nickel, molybdenum, tin, iron, tungsten, vanadium, potassium, zinc, niobium, chromium, and a combination thereof.
Claim 9
Dependent Claim
42 words
The filter of claim 5 wherein the one of said reactants is combined with anion or compound species selected from the group consisting of oxide, boride, carbide, nitride, halide, phosphide, aluminide, silicide, nitrate, sulfate, phosphate, carbonate, organic anion, or a combination thereof.
Claim 10
Dependent Claim
21 words
The filter of claim 1, 2, or 3 wherein the reactants of said coating consist essentially of iron oxide and aluminum.
Claim 11
Dependent Claim
44 words
A filter of claim 1, 2, or 3 wherein said substrate is ceramic material selected from the group consisting of alumina, mullite, zircon, zirconia, spinel, cordierite, lithium aluminosilicate, titania, feldspar, quartz, fused silica, silicon carbide, kaolin clay, aluminum titanate, silicate, aluminate, and mixture thereof.
Claim 12
Dependent Claim
32 words
A filter of claim 1, 2, or 3 wherein said substrate comprises sintered metal powder selected from the group consisting of aluminum, iron, copper, steel, tin, and alloys therebetween and mixtures thereof.
Claim 13
Dependent Claim
28 words
Apparatus comprising the filter of claim 1, 2, or 3 and any entry means to the molten metal filter, which entry means is coated with said thermite coating.
Claim 14
Dependent Claim
30 words
Apparatus of claim 10 wherein said entry means is selected from the group consisting of nozzles, sheaths, pouring cups or basins, sprues, sprue wells, runners, reservoirs, and a combination thereof.
Claim 15
Dependent Claim
22 words
The filter of claim 1, 2, or 3 wherein the reactants of said coating consist essentially of chromia, iron oxide, and aluminum.
Claim 16
Dependent Claim
28 words
The filter of claim 1, 2, or 3 wherein the coating includes a diluent selected from the group consisting of alumina, chromia, titania, zirconia, and a combination thereof.
Claim 17
Dependent Claim
28 words
Apparatus comprising the filter of claim 1, 2, or 3 and an exit means from the molten metal filter, which exit means is coated with said thermite coating.
Claim 18
Dependent Claim
38 words
The filter of claim 1, 2, or 3 wherein one of said reactants is metal selected from Groups IA, IIA, IIIA, IVA, IIIB including the rare earth metals, IVB, VB, VIB, VIII, and IB, or a combination thereof.
Claim 19
Dependent Claim
36 words
The filter of claim 15 wherein said metal is selected from the group consisting of yttrium, manganese, tantalum, vanadium, silicon, titanium, zirconium, aluminum, uranium, barium, magnesium, berylium, thorium, calcium, rare earth metal, or a combination thereof.
Claim 20
Dependent Claim
29 words
The filter of claim 1, 2, or 3 wherein the reactants of said coating consist essentially of iron oxide and aluminum combined with metal selected from iron and chromium.
Claim 21
Dependent Claim
25 words
The filter of claim 1, 2, or 3 wherein the reactants of said coating consist essentially of chromia, iron oxide, and aluminum combined with iron.
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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) | 1994-06-10 | 1994-12-10 | 1995-06-11 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1998-06-10 | 1998-12-10 | 1999-06-11 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2002-06-10 | 2002-12-10 | 2003-06-11 | $7700.00 | Window Closed / Lapsed |