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US3759670A
Expired / Lapsed
US
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Initiating the pulling of a crystalline body from a molten stock
Assignee: Siemens AG
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Filing: 1970-09-18
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Granted: 1973-09-18
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Expires: 1990-09-18
Abstract
Abstract A METHOD AND APPARATUS FOR PULLING A CRYSTALLINE BODY BY A SEED CRYSTAL FASTENED IN A HOLDER FROM A MELTING STOCK HEATED, IN A COLD COIL CRUCIBLE, AT LEAST TO MELTING TEMPERATURE. THE METHOD COMPRISES HEATING THE HOLDER AND ONE END OF THE SEED CRYSTAL, MOVING THE PREHEATED ZONE TO THE OTHER END OF THE SEED CRYSTAL, APPROACHING THE HEATED END TO THE STOCK TO BE MOLTEN, WHEREBY THE LATTER IS HEATED TO A TEMPERATURE AT WHICH IT IS CONDUCTIVE, AND THEREAFTER, HEATING THE STOCK BY THE FIELD ISSUING FROM THE COLD COIL CRUCIBLE.
Inventors
- 👤 Tidt Rummel
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 15:53
CPC Classifications
C; C30; C30B; C30B15/00; C30B15/10; C30B15/14; Y; Y10; Y10T; Y10T117/00; Y10T117/10; Y10T117/1024; Y10T117/1032; Y10T117/1068
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) | 1976-09-17 | 1977-03-19 | 1977-09-18 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-09-17 | 1981-03-19 | 1981-09-18 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-09-17 | 1985-03-19 | 1985-09-18 | $7700.00 | Window Closed / Lapsed |