US3907962A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method of preparing a filter medium for the filtration of molten aluminum or a molten aluminum alloy
Assignee: Individual
•
Filing: 1972-02-17
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Granted: 1975-09-23
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Expires: 1992-02-17
Abstract
Abstract A method of preparing a filter medium for the filtration of molten aluminum or a molten aluminum alloy comprising the steps of using more than two halogenide compounds, of which at least one halogenide is selected from the group consisting of compounds of sodium fluoride, potassium chloride, silver chloride, potassium fluoride and sodium nitrate, and of which the second halogenide is selected from the group of compounds having a melting point of more than 1000*C consisting of calcium fluoride, magnesium fluoride, aluminum fluoride, barium chloride, cryolite, and cerium fluoride and mixtures thereof; heating said compounds until they are molten and then mixing thoroughly with some agitation to obtain a homogeneous melt and subjecting the thus obtained melt to a molding step.
Inventors
- 👤 Koichi Ogiso
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 11:57
CPC Classifications
C; C22; C22B; C22B21/00; C22B21/06; C22B21/066
Claims Analysis
Total Claims: 12
Claim 1
Independent Claim
121 words
A METHOD OF PREPARING A FILTERED MEDIUM FOR THE FILTATION OF MOLTEN ALUMINUM OR A MOLTEN ALUMINUM ALLOY COMPRISING THE STEPS OF USING MORE THAN TWO HALOGENIDE COMPOUNDS, OF WHICH AT LEAST ONE HALOGENIDE IS SELECTED FROM THE GROUP CONSISTING OF COMPOUNDS OF SODIUM FLUORIDE, POTASSIUM CHLORIDE, SILVER CHLORIDE, POTASSIUM FLUORIDE AND SODIUM NITRITE, AND OF WHICH THE SECOND HALOGENIDE IS SELECTED FROM THE GROUP OF COMPOUNDS HAVING A MELTING POINT OF MORE THAN 1000*C CONSISTING OF CALCIUM FLUORIDE, MAGNESIUM FLUORIDE, ALUMINUM FLUORIDE, BARIUM CHLORIDE, CRYOLITE, AND CERIUM FLUORIDE AND MIXTURES THEREOF, HEATING SAID COMPOUNDS UNTIL THEY ARE MOLTEN AND THEN MIXING THOROUGHLY WITH SOME AGIATION TO OBTAIN A HOMOGENEOUS MELT AND SUBJECTING THE THUS OBTAINED MELT TO A MOLDINP STEP.
Claim 2
Independent Claim
121 words
A METHOD OF PREPARING A FILTERED MEDIUM FOR THE FILTATION OF MOLTEN ALUMINUM OR A MOLTEN ALUMINUM ALLOY COMPRISING THE STEPS OF USING MORE THAN TWO HALOGENIDE COMPOUNDS, OF WHICH AT LEAST ONE HALOGENIDE IS SELECTED FROM THE GROUP CONSISTING OF COMPOUNDS OF SODIUM FLUORIDE, POTASSIUM CHLORIDE, SILVER CHLORIDE, POTASSIUM FLUORIDE AND SODIUM NITRITE, AND OF WHICH THE SECOND HALOGENIDE IS SELECTED FROM THE GROUP OF COMPOUNDS HAVING A MELTING POINT OF MORE THAN 1000*C CONSISTING OF CALCIUM FLUORIDE, MAGNESIUM FLUORIDE, ALUMINUM FLUORIDE, BARIUM CHLORIDE, CRYOLITE, AND CERIUM FLUORIDE AND MIXTURES THEREOF, HEATING SAID COMPOUNDS UNTIL THEY ARE MOLTEN AND THEN MIXING THOROUGHLY WITH SOME AGIATION TO OBTAIN A HOMOGENEOUS MELT AND SUBJECTING THE THUS OBTAINED MELT TO A MOLDINP STEP.
Claim 3
Dependent Claim
44 words
The method as claimed in claim 1, wherein the filter medium is admixed with at least one halogenide compound having a metal ingredient selected from the group consisting of calcium ion, sodium ion, and lithium ion which have the property to produce hydrogen compounds.
Claim 4
Dependent Claim
34 words
The method as claimed in claim 1, wherein there is added to the filter medium one or more than one compounds selected from the group consisting of carbon, nitrogen, boron, and silicon containing compounds.
Claim 5
Dependent Claim
34 words
The method as claimed in claim 2, wherein there is added to the filter medium one or more than one compounds selected from the group consistings of carbon, nitrogen, boron, and silicon containing compounds.
Claim 6
Dependent Claim
32 words
The method as claimed in claim 1, wherein there is added to the filter medium at least one fire-resistant material selected from the group consisting of ceramics, glass wool, and carbon fiber.
Claim 7
Dependent Claim
32 words
The method as claimed in claim 2, wherein there is added to the filter medium at least one fire-resistant material selected from the group consisting of ceramics, glass wool, and carbon fiber.
Claim 8
Dependent Claim
32 words
The meThod as claimed in claim 3, wherein there is added to the filter medium at least one fire-resistant material selected from the group consisting of ceramics, glass wool, and carbon fiber.
Claim 9
Dependent Claim
33 words
The method as claimed in claim 1, including the step of admixing metal powder, or metal lump, of which the melting point is higher than the aluminum melting point before the melting step.
Claim 10
Dependent Claim
33 words
The method as claimed in claim 2, including the step of admixing metal powder, or metal lump, of which the melting point is higher than the aluminum melting point before the melting step.
Claim 11
Dependent Claim
33 words
The method as claimed in claim 3, including the step of admixing metal powder, or meal lump, of which the melting point is higher than the aluminum melting point before the melting step.
Claim 12
Dependent Claim
34 words
The method as claimed in claim 5, including the step of admixing the metal powder, or metal lump, of which the melting point is higher than the aluminum melting point before the melting step.
References Cited (Backward Citations)
US3524548A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1978-09-22 | 1979-03-24 | 1979-09-23 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-09-22 | 1983-03-24 | 1983-09-23 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-09-22 | 1987-03-24 | 1987-09-23 | $7700.00 | Window Closed / Lapsed |