Patent US4661335A successfully refreshed from Google Patents.
US4661335A
Expired / Lapsed
US
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Novel silicon powder having high purity and density and method of making same
Assignee: Rhone Poulenc Specialites Chimiques
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Filing: 1985-11-18
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Granted: 1987-04-28
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Expires: 2005-11-18
Abstract
Abstract A powder of elemental silicon having high purity and a density in excess of about 0.6 g/cm 3 , preferably ranging from 0.8 to 1.2 g/cm 3 , and which is non-amorphous as determined by X-ray analysis, is facilely prepared by thermally decomposing a silane feedstream at a decomposition reaction temperature ranging from 500° to 700° C., preferably from 500° to 600° C.
Inventors
- 👤 Bernard Boudot
- 👤 Philippe Nataf
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-07 14:29
CPC Classifications
C; C01; C01B; C01B33/00; C01B33/02; C01B33/021; C01B33/027; C01B33/029
Claims Analysis
Total Claims: 12
Claim 1
Independent Claim
27 words
A high purity silicon powder which is non-amorphous as determined by X-ray diffraction analysis, said powder having a density in excess of about 0.6 g/cm 3 .
Claim 2
Dependent Claim
27 words
A high purity silicon powder which is non-amorphous as determined by X-ray diffraction analysis, said powder having a density in excess of about 0.6 g/cm 3 .
Claim 3
Dependent Claim
28 words
The silicon powder as defined by claim 1, wherein a majority of the silicon is polycrystalline, and the specific surface area thereof ranges from 1 to 2 m2/g.
Claim 4
Dependent Claim
13 words
The silicon powder as defined by claim 1, comprising essentially spherical silicon particulates.
Claim 5
Dependent Claim
22 words
The silicon powder as defined by claim 1, comprising silicon particulates having an average diameter ranging from about 2 to 5 microns.
Claim 6
Dependent Claim
14 words
The silicon powder as defined by claim 4, comprising aggregates of about 50 microns.
Claim 7
Dependent Claim
19 words
The silicon powder as defined by claim 1, having a density ranging from 0.8 to 1.2 g/cm 3 .
Claim 8
Dependent Claim
79 words
A process for the preparation of a high purity silicon powder which is non-amorphous as determined by x-ray diffraction analysis, said powder having a density in excess of about 0.6g/cm 3 , comprising thermally decomposing a silane feedstream at a decomposition reaction temperature ranging from 500° to 700° C., said thermal decomposition being carried out in a decomposition zone which comprises a gaseous feedstream, said gaseous feedstream uniformly and homogeneously comprising at least 15% by volume of unreacted silane.
Claim 9
Dependent Claim
79 words
A process for the preparation of a high purity silicon powder which is non-amorphous as determined by x-ray diffraction analysis, said powder having a density in excess of about 0.6g/cm 3 , comprising thermally decomposing a silane feedstream at a decomposition reaction temperature ranging from 500° to 700° C., said thermal decomposition being carried out in a decomposition zone which comprises a gaseous feedstream, said gaseous feedstream uniformly and homogeneously comprising at least 15% by volume of unreacted silane.
Claim 10
Dependent Claim
17 words
The process as defined by claim 7, said decomposition reaction temperature ranging from 500° to 600° C.
Claim 11
Dependent Claim
23 words
The process as defined by claim 7 wherein said powder is produced from a starting material consiting of a stream of pure silane.
Claim 12
Dependent Claim
24 words
The process as defined by claim 7 wherein said powder is produced by thermally decomposing a silane feedstream without an inital presence of silicon.
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) | 1990-04-27 | 1990-10-27 | 1991-04-28 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1994-04-27 | 1994-10-27 | 1995-04-28 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1998-04-27 | 1998-10-27 | 1999-04-28 | $7700.00 | Window Closed / Lapsed |