Patent US3616220A successfully refreshed from Google Patents.
Patent US3321299A successfully refreshed from Google Patents.
US3321299A
Expired / Lapsed
US
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Apparatus and process for preparing semiconductor rods
Assignee: Monsanto Co
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Filing: 1964-10-13
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Granted: 1967-05-23
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Expires: 1984-10-13
Abstract
No abstract record available.
Inventors
- 👤 Richard J Binder
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 18:07
CPC Classifications
C; C30; C30B; C30B13/00; C30B13/28; C30B13/30; Y; Y10; Y10T; Y10T117/00; Y10T117/10; Y10T117/1004; Y10T117/1008
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
120 words
IN A METHOD OF ZONE MELTING A ROD OF SEMICONDUCTOR MATERIAL IN WHICH THE ROD IS VERTICALLY SUPPORTED AT BOTH ENDS AND A MOLTEN ZONE, PRODUCED BY INDUCTIVE HEATING THROUGH THE MEDIUM OF A HIGH FREQUENCY WORK COIL SURROUNDING SAID ROD, IS FORMED IN SAID ROD INTERMEDIATE THE TWO ENDS THEREOF, SAID MOLTEN ZONE BEING CAUSED TO MOVE RELATIVE TO SAID ROD ALONG THE LONGITUDINAL AXIS THEREOF TO ESTABLISH AN INTERFACE OF RESOLIDIFICATION BETWEEN SAID MOLTEN ZONES AND THE ROD FORMED THEREFROM, THE IMPROVEMENT WHICH COMPRISES UTILIZING THE VOLTAGE OF SAID WORK COIL, WHICH VOLTAGE CHANGES WITH A CHANGE IN THE DIAMETER OF THE INTERFACE OF RESOLIDIFICATION, FOR CONTROLLING MEANS TO EFFECT A CHANGE IN THE DIAMETER OF THE INTER-
Claim 2
Dependent Claim
120 words
IN A METHOD OF ZONE MELTING A ROD OF SEMICONDUCTOR MATERIAL IN WHICH THE ROD IS VERTICALLY SUPPORTED AT BOTH ENDS AND A MOLTEN ZONE, PRODUCED BY INDUCTIVE HEATING THROUGH THE MEDIUM OF A HIGH FREQUENCY WORK COIL SURROUNDING SAID ROD, IS FORMED IN SAID ROD INTERMEDIATE THE TWO ENDS THEREOF, SAID MOLTEN ZONE BEING CAUSED TO MOVE RELATIVE TO SAID ROD ALONG THE LONGITUDINAL AXIS THEREOF TO ESTABLISH AN INTERFACE OF RESOLIDIFICATION BETWEEN SAID MOLTEN ZONES AND THE ROD FORMED THEREFROM, THE IMPROVEMENT WHICH COMPRISES UTILIZING THE VOLTAGE OF SAID WORK COIL, WHICH VOLTAGE CHANGES WITH A CHANGE IN THE DIAMETER OF THE INTERFACE OF RESOLIDIFICATION, FOR CONTROLLING MEANS TO EFFECT A CHANGE IN THE DIAMETER OF THE INTER-
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1970-05-22 | 1970-11-21 | 1971-05-23 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1974-05-22 | 1974-11-21 | 1975-05-23 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1978-05-22 | 1978-11-21 | 1979-05-23 | $7700.00 | Window Closed / Lapsed |