US3249406A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Necked float zone processing of silicon rod
Assignee: Dow Silicones Corp
•
Filing: 1963-01-08
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Granted: 1966-05-03
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Expires: 1983-01-08
Abstract
No abstract record available.
Inventors
- 👤 Lloyd R Crosby
- 👤 Herbert M Stewart
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 20:32
CPC Classifications
C; C30; C30B; C30B13/00; C30B13/16; C30B13/20; H; H05; H05B; H05B6/00; H05B6/02; H05B6/22; H05B6/30; Y; Y10; Y10S; Y10S117/00; Y10S117/90
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
148 words
IN THE METHOD OF FLOAT-ZONE PROCESSING A CYLINDRICAL ROD OF CRYSTALLINE SEMICONDUCTOR MATERIAL COMPRISING HEATING TO THE MELTING POINT A CROSS-SECTIONAL ZONE OF SAID ROD BY MEANS HAVING NO CONTACT WITH SAID MOLTEN ZONE AND CAUSING SAID MOLTEN ZONE TO BE DISPLACED LONGITUDINALLY ALONG SAID ROD, SAID MOLTEN ZONE BEING CREATED BY MEANS OF AN ELECTRIC CURRENT OF HIGH FREQUENCY, THE IMPROVEMENT COMPRISING MOVING LONGITUDINALLY WITH RESPECT TO SAID ROD FROM ONE END OF SAID ROD TO THE OTHER AN ENCIRCLING ELECTRICALLY CONDUCTIVE COIL HAVING AN INTERNAL DIAMETER SMALLER THAN THE DIAMETER OF ALL CYLINDRICAL PORTIONS OF SAID ROD OUTSIDE OF SAID MOLTEN ZONE, WHILE PASING THROUGH SAID COIL A HIGH FREQUENCY CURRENT, SAID MOVING OF SAID COIL WITH RESPECT TO SAID ROD BEING EFFECTUATED BY THE ELECTORMAGNETIC FIELD OF SAID COIL PINCHING SAID MOLTEN ZONE TO A NECK OF A SIZE CAPABLE OF PASSING THROUGH SAID COIL.
Claim 2
Dependent Claim
148 words
IN THE METHOD OF FLOAT-ZONE PROCESSING A CYLINDRICAL ROD OF CRYSTALLINE SEMICONDUCTOR MATERIAL COMPRISING HEATING TO THE MELTING POINT A CROSS-SECTIONAL ZONE OF SAID ROD BY MEANS HAVING NO CONTACT WITH SAID MOLTEN ZONE AND CAUSING SAID MOLTEN ZONE TO BE DISPLACED LONGITUDINALLY ALONG SAID ROD, SAID MOLTEN ZONE BEING CREATED BY MEANS OF AN ELECTRIC CURRENT OF HIGH FREQUENCY, THE IMPROVEMENT COMPRISING MOVING LONGITUDINALLY WITH RESPECT TO SAID ROD FROM ONE END OF SAID ROD TO THE OTHER AN ENCIRCLING ELECTRICALLY CONDUCTIVE COIL HAVING AN INTERNAL DIAMETER SMALLER THAN THE DIAMETER OF ALL CYLINDRICAL PORTIONS OF SAID ROD OUTSIDE OF SAID MOLTEN ZONE, WHILE PASING THROUGH SAID COIL A HIGH FREQUENCY CURRENT, SAID MOVING OF SAID COIL WITH RESPECT TO SAID ROD BEING EFFECTUATED BY THE ELECTORMAGNETIC FIELD OF SAID COIL PINCHING SAID MOLTEN ZONE TO A NECK OF A SIZE CAPABLE OF PASSING THROUGH SAID COIL.
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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) | 1969-05-02 | 1969-11-01 | 1970-05-03 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1973-05-02 | 1973-11-01 | 1974-05-03 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1977-05-02 | 1977-11-01 | 1978-05-03 | $7700.00 | Window Closed / Lapsed |