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US4460407A
Expired / Lapsed
US
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Method of preparing magnesium alloy particles
Assignee: Dow Chemical Co
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Filing: 1982-12-20
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Granted: 1984-07-17
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Expires: 2002-12-20
Abstract
Abstract Molten magnesium alloy is stirred under a substantially inert atmosphere as it is cooled to freezing, thereby forming discrete solid particles of the alloy. The process may be carried out batch-wise or continuously.
Inventors
- 👤 Earl K. Keith
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-09 09:30
CPC Classifications
B; B22; B22F; B22F9/00; B22F9/02; B22F9/06
Claims Analysis
Total Claims: 22
Claim 1
Independent Claim
110 words
A method for preparing particles of magnesium alloy, said process comprising, stirring a melt of said alloy under an inert atmosphere while cooling sufficiently, and at a cooling rate, to form crystalline occlusions dispersed in the melt, thereby converting said melt to a slurry having a slurry temperature range of at least about 10° C., said slurry having a discrete solid phase and a liquid phase, continuing said stirring, inert atmosphere, and cooling to cause the liquid phase to freeze in disperse manner onto the solid phase as the temperature drops below said slurry temperature range, and removing from the pot the so-formed solid particles of metal as free-flowing pellets.
Claim 2
Independent Claim
110 words
A method for preparing particles of magnesium alloy, said process comprising, stirring a melt of said alloy under an inert atmosphere while cooling sufficiently, and at a cooling rate, to form crystalline occlusions dispersed in the melt, thereby converting said melt to a slurry having a slurry temperature range of at least about 10° C., said slurry having a discrete solid phase and a liquid phase, continuing said stirring, inert atmosphere, and cooling to cause the liquid phase to freeze in disperse manner onto the solid phase as the temperature drops below said slurry temperature range, and removing from the pot the so-formed solid particles of metal as free-flowing pellets.
Claim 3
Dependent Claim
47 words
The method of claim 1 wherein the magnesium alloy comprises a predominant amount of magnesium alloyed with a minor amount of at least one metal selected from the group consisting of aluminum, zirconium, zinc, copper, cerium, arsenic, barium, cadmium, calcium, cobalt, lead, manganese, nickel, silver, and tin.
Claim 4
Dependent Claim
35 words
The method of claim 1 wherein the magnesium alloy comprises a predominant amount of magnesium alloyed with a minor amount of at least one metal selected from the group consiting of aluminum, zinc, and cerium.
Claim 5
Dependent Claim
24 words
The method of claim 1 wherein the magnesium alloy comprises a predominant amount of magnesium alloyed with a minor amount of aluminum and zinc.
Claim 6
Dependent Claim
22 words
The method of claim 1 wherein the magnesium alloy comprises a predominant amount of magnesium alloyed with a minor amount of aluminum.
Claim 7
Dependent Claim
22 words
The method of claim 1 wherein the magnesium alloy comprises a predominant amount of magnesium alloyed with a minor amount of zinc.
Claim 8
Dependent Claim
22 words
The method of claim 1 wherein the magnesium alloy comprises a predominant amount of magnesium alloyed with a minor amount of cerium.
Claim 9
Dependent Claim
11 words
The method of claim 1 wherein the inert atmosphere comprises argon.
Claim 10
Dependent Claim
12 words
The method of claim 1 wherein the inert atmosphere comprises sulfur hexafluoride.
Claim 11
Dependent Claim
16 words
The method of claim 1 wherein the slurry temperature range is at least about 20° C.
Claim 12
Dependent Claim
61 words
The method of claim 1 when performed in a continuous manner in which molten magnesium alloy, excluding oxide-forming reactants, is fed continuously to a stirred vessel, the alloy flowing through the vessel being cooled to freezing before it exits the vessel at a point distal to that of the feed, and collecting particles of magnesium alloy which flow from the exit.
Claim 13
Independent Claim
108 words
A method for graining magnesium into solid discrete particles, said method comprising alloying the magnesium with a minor amount of at least one alloying metal selected from the group consisting of aluminum, zirconium, zinc, copper, cerium, arsenic, barium, cadmium, calcium, cobalt, lead, manganese, nickel, silver, and tin, thereby creating an alloy having a slurry temperature range of at least about 10° C., stirring the alloy at molten temperature under an inert atmosphere to prevent formation of oxides or other insoluble ingredients, and cooling the alloy, while stirring, until the alloy has cooled to freezing at a temperature below the slurry temperature range, thereby forming solid discrete alloy particles.
Claim 14
Independent Claim
108 words
A method for graining magnesium into solid discrete particles, said method comprising alloying the magnesium with a minor amount of at least one alloying metal selected from the group consisting of aluminum, zirconium, zinc, copper, cerium, arsenic, barium, cadmium, calcium, cobalt, lead, manganese, nickel, silver, and tin, thereby creating an alloy having a slurry temperature range of at least about 10° C., stirring the alloy at molten temperature under an inert atmosphere to prevent formation of oxides or other insoluble ingredients, and cooling the alloy, while stirring, until the alloy has cooled to freezing at a temperature below the slurry temperature range, thereby forming solid discrete alloy particles.
Claim 15
Dependent Claim
23 words
The method of claim 12 wherein the alloying metal is at least one selected from the group consisting of aluminum, zinc, and cerium.
Claim 16
Dependent Claim
13 words
The method of claim 12 wherein the alloying metal is aluminum or zinc.
Claim 17
Dependent Claim
11 words
The method of claim 12 wherein the alloying metal is aluminum.
Claim 18
Dependent Claim
11 words
The method of claim 12 wherein the alloying metal is zinc.
Claim 19
Dependent Claim
11 words
The method of claim 12 wherein the alloying metal is cerium.
Claim 20
Dependent Claim
16 words
The method of claim 12 wherein the slurry temperature range is at least about 20° C.
Claim 21
Dependent Claim
11 words
The method of claim 12 wherein the inert atmosphere comprises argon.
Claim 22
Dependent Claim
12 words
The method of claim 12 wherein the inert atmosphere comprises sulfur hexafluoride.
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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) | 1987-07-17 | 1988-01-16 | 1988-07-17 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1991-07-17 | 1992-01-16 | 1992-07-17 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1995-07-17 | 1996-01-16 | 1996-07-17 | $7700.00 | Window Closed / Lapsed |