US3597171A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method of crystallization using solvent removal by reaction
Assignee: US Philips Corp
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Filing: 1967-10-19
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Granted: 1971-08-03
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Expires: 1987-10-19
Abstract
Abstract A METHOD OF MANUFACTURING CRYSTALS OF SEMICONDUCTOR MATERIALS IN WHICH A SEED CRYSTAL IS BROUGHT INTO CONTACT WITH A MOLTEN SATURATED SOLUTION OF THE SEMICONDUCTOR MATERIAL SHILE A GAS IS SUPPLIED TO THE ATMOSPHERE ABOVE THE SOLUTION WHICH REACTS WITH SOLVENT AT THE TEMPERATURE OF THE MELT TO FORM A VOLATILE COMPOUND SO THAT THE SOLVENT IS EXTRACTED FROM THE SURFACE LAYER AND A STATE OF OVER-SATURATION IS CAUSED IN THIS LAYER.
Inventors
- 👤 Wilhelmus Francisc Knippenberg
- 👤 Gerrit Verspui
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 05:43
CPC Classifications
C; C30; C30B; C30B17/00; C30B9/00
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1974-08-02 | 1975-02-01 | 1975-08-03 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-08-02 | 1979-02-01 | 1979-08-03 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-08-02 | 1983-02-01 | 1983-08-03 | $7700.00 | Window Closed / Lapsed |