US4525334A
Expired / Lapsed
US
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Process for the production of silicon
Assignee: Bayer AG
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Filing: 1984-03-13
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Granted: 1985-06-25
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Expires: 2004-03-13
Abstract
Abstract A process for the production of silicon comprising reacting a gaseous silicon compound of the formula SiH n X 4-n , wherein X is halogen and n is 0 to 3, with aluminum in solid state. The resulting silicon can be highly pure and will have the particle size of the aluminum feed, making it especially useful for production of solar cells.
Inventors
- 👤 Peter Woditsch
- 👤 Martin Abels
- 👤 Berthold Brazel
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 15:19
CPC Classifications
C; C01; C01B; C01B33/00; C01B33/02; C01B33/021; C01B33/027; C01B33/033
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
72 words
A process for the production of silicon comprising reacting a gaseous silicon compound of the formula SiH n X 4-n , wherein X is selected from the group consisting of fluorine, chlorine, bromine and iodine and n is 0 to 3, with aluminum in a reactor at an elevated temperature at which by product AlX 3 is in vapor state so that the reactor at all times contains only gases and solids.
Claim 2
Dependent Claim
72 words
A process for the production of silicon comprising reacting a gaseous silicon compound of the formula SiH n X 4-n , wherein X is selected from the group consisting of fluorine, chlorine, bromine and iodine and n is 0 to 3, with aluminum in a reactor at an elevated temperature at which by product AlX 3 is in vapor state so that the reactor at all times contains only gases and solids.
Claim 3
Dependent Claim
16 words
A process according to claim 1, wherein the temperature is from about 500° to 660° C.
Claim 4
Dependent Claim
16 words
A process according to claim 1, wherein the temperature is from about 550° to 650° C.
Claim 5
Dependent Claim
13 words
A process according to claim 1, wherein the silicon compound is silicon tetrachloride.
Claim 6
Dependent Claim
26 words
A process according to claim 1, wherein the aluminum is finely divided and has a specific surface area of more than about 0.05 m 2 /g.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1988-06-24 | 1988-12-24 | 1989-06-25 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1992-06-24 | 1992-12-24 | 1993-06-25 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1996-06-24 | 1996-12-24 | 1997-06-25 | $7700.00 | Window Closed / Lapsed |