US3113841A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Floating zone melting method for semiconductor rods
Assignee: Siemens Schuckertwerke AG
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Filing: 1960-04-20
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Granted: 1963-12-10
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Expires: 1980-04-20
Abstract
No abstract record available.
Inventors
- 👤 Reuschel Konrad
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 10:06
CPC Classifications
C; C30; C30B; C30B29/00; C30B29/02; C30B29/06; C01; C01B; C01B33/00; C01B33/02; C30B13/00; C30B13/16; C30B13/20; Y; Y10; Y10S; Y10S117/00; Y10S117/90
Claims Analysis
Total Claims: 1
Claim 1
Independent Claim
157 words
IN A METHOD OF CRUCIBLE-FREE FLOATING ZONE MELTING OF A SILICON ROD, IN WHICH THE ROD IS SUPPORTED IN A VERTICAL POSITION, AND A TRANSVERSELY EXTENDING MOLTEN ZONE IS FORMED IN THE ROD BY INDUCTIVE HEATING, THE MELT BEING SUPPORTED BY ADHERENCE TO THE ADJACENT SOLID ROD PORTIONS, AND IN WHICH SAID ZONE IS CAUSED TO MOVE LENGTHWISE OF THE ROD, THE IMPROVEMENT IN SAID ZONE MELTING COMPRISING FIRST PRECIPITATING THE SILICON UPON A SILICON ROD AND ABOUT AN END PORTION OF A PIECE OF HYPERPURE CARBON ATTACHED TO SAID SILICON ROD BY PASSING AN ELECTRIC CURRENT THROUGH THE SAID SILICON ROD AND ATTACHED PIECE OF CARBON TO HEAT THE ROD, AND PASSING A GASEOUS COMPOUND OF SILICON IN CONTACT WITH THE HEATED ROD TO DECOMPOSE THE COMPOUND TO SILICON AND ONE END OF THE CARBON END PORTION BECOMES EMBEDDED IN THE PRECIPITATED SILICON, THEREAFTER ATTACHING THE EXPOSED END OF SAID CARBON END PORTION TO A SUPPORT
References Cited (Backward Citations)
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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) | 1966-12-09 | 1967-06-10 | 1967-12-10 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1970-12-09 | 1971-06-10 | 1971-12-10 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1974-12-09 | 1975-06-10 | 1975-12-10 | $7700.00 | Window Closed / Lapsed |