US4374182A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Preparation of silicon metal through polymer degradation
Assignee: Dow Silicones Corp
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Filing: 1980-07-07
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Granted: 1983-02-15
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Expires: 2000-07-07
Abstract
Abstract What is disclosed is a method of forming silicon from the degradation of polychlorosilanes, a method of coating a substrate with said silicon and a product of said coating method. The method of forming silicon consists essentially of pyrolyzing said polychlorosilanes in an inert atmosphere or in a vacuum at a temperature of 500° C. to 1450° C.
Inventors
- 👤 John H. Gaul
- 👤 Donald R. Weyenberg
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 07:39
CPC Classifications
C; C01; C01B; C01B33/00; C01B33/02; C01B33/021; C01B33/08; C01B33/107
Claims Analysis
Total Claims: 10
Claim 1
Independent Claim
43 words
A method of preparing silicon consisting essentially of pyrolyzing a polychlorosilane, having a molecular weight greater than the molecular weight of Si 2 Cl 6 , in an inert atmosphere or in a vacuum, at a temperature of 500° C. to 1450° C.
Claim 2
Independent Claim
43 words
A method of preparing silicon consisting essentially of pyrolyzing a polychlorosilane, having a molecular weight greater than the molecular weight of Si 2 Cl 6 , in an inert atmosphere or in a vacuum, at a temperature of 500° C. to 1450° C.
Claim 3
Dependent Claim
19 words
A method of preparing silicon as in claim 1 wherein the polychlorosilane is free from residual catalyst and solvents.
Claim 4
Dependent Claim
17 words
A method of preparing silicon as in claim 1 wherein the polychlorosilane is essentially free from contaminants.
Claim 5
Dependent Claim
75 words
An article coated with silicon which article has been coated by a method consisting essentially of (I) coating the article with a polychlorosilane having a molecular weight greater than the molecular weight of Si 2 Cl 6 ; (II) heating said article to a temperature of 500° C. to 1450° C. for a time sufficient to form silicon and thereafter (III) cooling the article to room temperature whereby an article coated with silicon is obtained.
Claim 6
Dependent Claim
75 words
An article coated with silicon which article has been coated by a method consisting essentially of (I) coating the article with a polychlorosilane having a molecular weight greater than the molecular weight of Si 2 Cl 6 ; (II) heating said article to a temperature of 500° C. to 1450° C. for a time sufficient to form silicon and thereafter (III) cooling the article to room temperature whereby an article coated with silicon is obtained.
Claim 7
Dependent Claim
11 words
An article as in claim 4 which is a solar cell.
Claim 8
Dependent Claim
19 words
An article as in claim 4 wherein the article is coated with the polychlorosilane in a solvent before heating.
Claim 9
Independent Claim
74 words
A method of coating a substrate with silicon which consisting essentially of (I) treating a substrate with a polychlorosilane having a molecular weight greater than the molecular weight of Si 2 Cl 6 ; (II) heating said substrate to a temperature of 500° C. to 1450° C. for a time sufficient to form silicon on the substrate and thereafter (III) cooling the substrate to room temperature whereby a substrate coated with silicon is obtained.
Claim 10
Independent Claim
74 words
A method of coating a substrate with silicon which consisting essentially of (I) treating a substrate with a polychlorosilane having a molecular weight greater than the molecular weight of Si 2 Cl 6 ; (II) heating said substrate to a temperature of 500° C. to 1450° C. for a time sufficient to form silicon on the substrate and thereafter (III) cooling the substrate to room temperature whereby a substrate coated with silicon is obtained.
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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) | 1986-02-14 | 1986-08-16 | 1987-02-15 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1990-02-14 | 1990-08-16 | 1991-02-15 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1994-02-14 | 1994-08-16 | 1995-02-15 | $7700.00 | Window Closed / Lapsed |