Patent US4425408A successfully refreshed from Google Patents.
US4425408A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Production of single crystal semiconductors
Assignee: Spheral Solar Power Inc
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Filing: 1982-11-12
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Granted: 1984-01-10
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Expires: 2002-11-12
Abstract
Abstract Polycrystalline semiconductor material is treated to form a skin of a thermally stable substance and melted with the molten material retained by the film. Upon cooling, the material solidifies as single crystal and the skin is removed.
Inventors
- 👤 Jules D. Levine
- 👤 William R. McKee
- 👤 Kent R. Carson
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 08:48
CPC Classifications
C; C30; C30B; C30B11/00; C30B11/002; C30B29/00; C30B29/60; Y; Y10; Y10T; Y10T428/00; Y10T428/29; Y10T428/2982; Y10T428/2991; Y10T428/2993
Claims Analysis
Total Claims: 3
Claim 1
Independent Claim
31 words
A particle of single crystal semiconductor material encompassed within a skin comprising a thermally stable compound formed by the reaction of said material with a reactive gas at an elevated temperature.
Claim 2
Dependent Claim
31 words
A particle of single crystal semiconductor material encompassed within a skin comprising a thermally stable compound formed by the reaction of said material with a reactive gas at an elevated temperature.
Claim 3
Dependent Claim
27 words
The particle according to claim 1 wherein said particle is in platelet form on a substrate with said free surfaces of said material covered by said skin.
References Cited (Backward Citations)
US3998659A
Cited
US4033792A
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US4040849A
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US4298423A
Cited
US4188177A
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US4173494A
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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) | 1987-01-09 | 1987-07-11 | 1988-01-10 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1991-01-09 | 1991-07-11 | 1992-01-10 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1995-01-09 | 1995-07-11 | 1996-01-10 | $7700.00 | Window Closed / Lapsed |