Patent US3310384A successfully refreshed from Google Patents.
US3310384A
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Method and apparatus for cruciblefree zone melting
Assignee: Siemens Schuckertwerke AG
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Filing: 1965-05-26
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Granted: 1967-03-21
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Expires: 1985-05-26
Abstract
No abstract record available.
Inventors
- 👤 Keller Wolfgang
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 18:13
CPC Classifications
C; C30; C30B; C30B13/00; C30B13/28; Y; Y10; Y10T; Y10T117/00; Y10T117/10; Y10T117/1024; Y10T117/1076; Y10T117/1088
Claims Analysis
Total Claims: 1
Claim 1
Independent Claim
133 words
APPARATUS FOR CRUCIBLE-FREE ZONE MELTING A VERTICALLY MOUNTED CRYSTALLINE ROD OF RELATIVELY LARGE DIAMETER JOINED ONE END TO A SEED CRYSTAL OF RELATIVELY SMALL DIAMETER, COMPRISING A FIRST INDUCTION COIL SURROUNDING THE SEED CRYSTAL AT IS JUNCTION WITH THE ROD AND HAVING AN INNER DIAMETER ONLY SLIGHTLY LARGER THAN THE DIAMETER OF THE SEED CRYSTAL, SAID FIRST INDUCTION COIL BEING ENERGIZABLE FOR HEATING THE SEED CRYSTAL TO A TEMPERATURE AT WHICH A MELTING ZONE IS FORMED THEREIN AND THE SEED CRYSTAL IS FUSED TO THE ROD, AND A SECOND INDUCTION COIL COAXIAL TO AND SURROUNDING SID FIRST INDUCTION COIL, SAID SECOND INDUCTION COIL HAVING AN INNER DIAMETER SLIGHTLY LARGER THAN THE DIAMETER OF THE ROD AND BEING ENERGIZABLE FOR APPLYING HEAT TO THE MELTING ZONE SO THAT IT IS MAINTAINED IN MOLTEN STATE.
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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) | 1970-03-20 | 1970-09-19 | 1971-03-21 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1974-03-20 | 1974-09-19 | 1975-03-21 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1978-03-20 | 1978-09-19 | 1979-03-21 | $7700.00 | Window Closed / Lapsed |