US3715205A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method for reducing chlorides and a device therefor
Assignee: Individual
•
Filing: 1971-01-07
•
Granted: 1973-02-06
•
Expires: 1991-01-07
Abstract
Abstract A method for reducing a metal chloride, especially for reducing a chloride of sublimable metal by using a metallic reducing agent, and a device therefor. A tank for storing the starting metal chloride is connected to a separate reducing chamber through a pipe, which tank and chamber are heated by separate heat sources, respectively. The metallic reducing agent is heated, so as to form gaseous phase thereof which gaseous phase is kept at a temperature higher than the melting point of the metal and brought into contact with the vapor of the starting metal chloride to cause the reducing reaction. The reduction is effected while measuring and controlling the flow rate of the starting metal chloride vapor to the reducing chamber.
Inventors
- 👤 H Ishizuka
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 20:56
CPC Classifications
C; C22; C22B; C22B34/00; C22B34/10; C22B34/14; C22B5/00; C22B5/02; C22B5/04; Y; Y10; Y10S; Y10S266/00; Y10S266/905
Claims Analysis
Total Claims: 9
Claim 1
Independent Claim
87 words
A method for reducing a metal chloride, comprising providing a reducing chamber with a metallic reducing agent therein, delivering a vapor of the metal chloride to be reduced into a storage tank, condensing the vapor in said tank, melting the metallic reducing agent, evaporating the metal chloride in said tank by heating, transferring the now vaporous metal chloride to the reaction chamber for reaction with the metallic reducing agent, and controlling the reaction by regulating the flow rate of the vaporous metal chloride to the reaction chamber.
Claim 2
Independent Claim
87 words
A method for reducing a metal chloride, comprising providing a reducing chamber with a metallic reducing agent therein, delivering a vapor of the metal chloride to be reduced into a storage tank, condensing the vapor in said tank, melting the metallic reducing agent, evaporating the metal chloride in said tank by heating, transferring the now vaporous metal chloride to the reaction chamber for reaction with the metallic reducing agent, and controlling the reaction by regulating the flow rate of the vaporous metal chloride to the reaction chamber.
Claim 3
Dependent Claim
33 words
A method as claimed in claim 1 wherein said flow rate of the metal chloride vapor is determined by measuring the temperature or pressure differential between the reaction chamber and the storage tank.
Claim 4
Dependent Claim
62 words
A method as claimed in claim 1 wherein that portion of said reaction chamber, at which the delivered metal chloride vapor encounters the surface of the molten metallic reducing agent, is kept at a temperature above the melting point of the metallic reducing agent but below the alloying temperature of the metallic reducing agent and the material of the reaction chamber wall.
Claim 5
Dependent Claim
25 words
A method as claimed in claim 1 wherein said metal chloride is selected from the group consisting of zirconium tetrachloride, hafnium tetrachloride, and columbium pentachloride.
Claim 6
Independent Claim
128 words
A device for reducing a metal chloride, comprising a metal chloride vapor feeder including a metal chloride storage tank having a condenser, and a first heating means surrounding the storage tank; a reducing chamber independent of and separate from said metal chloride vapor feeder and including an outer cylindrical member, a lid capable of sealing the inside of the outer cylindrical member from tHe outside, an inner cylindrical member disposed within the outer cylindrical member with a metallic reducing agent therein, and a second heating means surrounding the outer cylindrical member; a pipe means connecting the metal chloride vapor feeder and the reacting chamber and including a third heating means; and a measuring means for determining the flow rate of the metal chloride vapor through the pipe means.
Claim 7
Independent Claim
128 words
A device for reducing a metal chloride, comprising a metal chloride vapor feeder including a metal chloride storage tank having a condenser, and a first heating means surrounding the storage tank; a reducing chamber independent of and separate from said metal chloride vapor feeder and including an outer cylindrical member, a lid capable of sealing the inside of the outer cylindrical member from tHe outside, an inner cylindrical member disposed within the outer cylindrical member with a metallic reducing agent therein, and a second heating means surrounding the outer cylindrical member; a pipe means connecting the metal chloride vapor feeder and the reacting chamber and including a third heating means; and a measuring means for determining the flow rate of the metal chloride vapor through the pipe means.
Claim 8
Dependent Claim
40 words
A device as claimed in claim 1 wherein said measuring means comprises at least one thermometer or one pressure gauge mounted on the metal chloride vapor feeder and at least one thermometer or pressure meter mounted on the reaction chamber.
Claim 9
Dependent Claim
62 words
A device as claimed in claim 1 wherein said reaction chamber includes at least two thermometers and said second heating means is used to maintain the portion of the inner cylindrical member within a temperature range between the melting point of the metallic reducing agent and the alloying temperature of the metallic reducing agent and the metal of the reaction chamber wall.
References Cited (Backward Citations)
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US2915384A
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US3071459A
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US3519258A
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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) | 1976-02-06 | 1976-08-07 | 1977-02-06 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-02-06 | 1980-08-07 | 1981-02-06 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-02-06 | 1984-08-07 | 1985-02-06 | $7700.00 | Window Closed / Lapsed |