US4407858A
Expired / Lapsed
US
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Method for producing films of sintered polycrystalline silicon
Assignee: Siemens AG
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Filing: 1981-12-29
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Granted: 1983-10-04
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Expires: 2001-12-29
Abstract
Abstract A low porosity sintered polycrystalline silicon film is produced by grinding initial silicon material in a non-oxygen-containing liquid, such as decahydronaphthalene, to an average grain size corresponding to a specific surface of at least 50 m 2 /g; thickening the so-attained grinding mass with a non-oxygen-containing material, such as polyisobutylene and/or polyethylene in a suitable solvent, so as to attain a viscosity in the resultant slip suitable for drawing a film from such slip, and drawing a film from such slip, optionally dividing the film into desired sized pieces, and sintering the resultant film or pieces.
Inventors
- 👤 Leopold Hanke
- 👤 Hans Hellebrand
- 👤 Helmut Schmelz
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 11:13
CPC Classifications
C; C01; C01B; C01B33/00; C01B33/02; C30; C30B; C30B1/00; C30B1/02; C30B29/00; C30B29/02; C30B29/06
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
109 words
In a method of producing films of sintered polycrystalline silicon whereby relatively fine silicon particles are worked-up with additives into a slip, which is drawn-out into a film and then sintered, the improvement comprising: grinding initial silicon material in a non-oxygen-containing liquid to an average grain size corresponding to specific surface of at least 50m 2 /g; directly thickening the ground silicon particles and non -oxygen-containing liquid by adding a further non-oxygen-containing material so as to attain a viscosity in the resultant slip suitable for drawing a film from such slip; and in a manner known per se, drawing a film from such slip and sintering the resultant film.
Claim 2
Dependent Claim
109 words
In a method of producing films of sintered polycrystalline silicon whereby relatively fine silicon particles are worked-up with additives into a slip, which is drawn-out into a film and then sintered, the improvement comprising: grinding initial silicon material in a non-oxygen-containing liquid to an average grain size corresponding to specific surface of at least 50m 2 /g; directly thickening the ground silicon particles and non -oxygen-containing liquid by adding a further non-oxygen-containing material so as to attain a viscosity in the resultant slip suitable for drawing a film from such slip; and in a manner known per se, drawing a film from such slip and sintering the resultant film.
Claim 3
Dependent Claim
14 words
In a method as defined in claim 1 wherein said non-oxygen-containing liquid is decahydronaphthalene.
Claim 4
Dependent Claim
24 words
In a method as defined in claim 1 wherein said non-oxygen-containing material is selected from the group consisting of polyisobutylene, polyethylene and mixtures thereof.
Claim 5
Dependent Claim
16 words
In a method as defined in claim 3 wherein said non-oxygen-containing is 10% solution of polyisobutylene.
Claim 6
Dependent Claim
28 words
In a method as defined in claim 3 wherein said non-oxygen-containing material is an admixture of a 10% solution of polyisobutylene and a solution of polyethylene in benzene.
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) | 1986-10-03 | 1987-04-04 | 1987-10-04 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1990-10-03 | 1991-04-04 | 1991-10-04 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1994-10-03 | 1995-04-04 | 1995-10-04 | $7700.00 | Window Closed / Lapsed |