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Patent US4445931A successfully refreshed from Google Patents.
US4445931A
Expired / Lapsed
US
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Production of metal powder
Assignee: United States Department of the Interior
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Filing: 1982-01-20
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Granted: 1984-05-01
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Expires: 2002-01-20
Abstract
Abstract Fine mesh metal powder, such at titanium powder, is prepared by reaction of a halide of the metal, in vapor form, with a fine spray of molten sodium at a temperature below the melting point of the metal.
Inventors
- 👤 Robert B. Worthington
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 11:41
CPC Classifications
C; C22; C22B; C22B34/00; C22B34/10; C22B34/12; C22B34/1263; C22B34/1268; C22B34/1272; B; B22; B22F; B22F9/00; B22F9/16; B22F9/18; B22F9/28
Claims Analysis
Total Claims: 10
Claim 1
Independent Claim
37 words
A process for production of metal powder comprising reacting a halide of the metal, in vapor form, with a fine spray of molten sodium, the temperature of the reaction being below the melting point of the metal.
Claim 2
Dependent Claim
37 words
A process for production of metal powder comprising reacting a halide of the metal, in vapor form, with a fine spray of molten sodium, the temperature of the reaction being below the melting point of the metal.
Claim 3
Dependent Claim
23 words
The process of claim 1 in which the metal is selected from the group consisting of titanium, columbium, hafnium, uranium, vanadium, and zirconium.
Claim 4
Dependent Claim
11 words
The process of claim 2 in which the metal is titanium.
Claim 5
Dependent Claim
19 words
The process of claim 3 in which the temperature of the reaction ranges from about 100° to 1200° C.
Claim 6
Dependent Claim
12 words
The process of claim 1 in which the halide is a chloride.
Claim 7
Dependent Claim
13 words
The process of claim 1 in which the metal halide is titanium tetrachloride.
Claim 8
Dependent Claim
19 words
The process of claim 1 in which the spray of molten sodium is obtained by atomizing the molten metal.
Claim 9
Dependent Claim
17 words
The process of claim 7 in which the atomization is achieved by means of a spray nozzle.
Claim 10
Dependent Claim
26 words
The process of claim 1 in which the temperature of the reaction is regulated by controlling the flow rate of the molten sodium into the reactor.
References Cited (Backward Citations)
US2892697A
Cited
US2881067A
Cited
US2950185A
Cited
US2984560A
Cited
US3415639A
Cited
US3418106A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1987-05-01 | 1987-10-31 | 1988-05-01 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1991-05-01 | 1991-10-31 | 1992-05-01 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1995-05-01 | 1995-10-31 | 1996-05-01 | $7700.00 | Window Closed / Lapsed |