US2809136A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Apparatus and method of preparing crystals of silicon germanium group
Assignee: GTE Sylvania Inc
•
Filing: 1954-03-10
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Granted: 1957-10-08
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Expires: 1974-03-10
Abstract
No abstract record available.
Inventors
- 👤 George D Mortimer
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 13:55
CPC Classifications
C; C30; C30B; C30B15/00; C30B15/14; C30B15/02; C30B15/20; C30B15/22; C30B15/24; Y; Y10; Y10T; Y10T117/00; Y10T117/10; Y10T117/1024; Y10T117/1032; Y10T117/1036; Y10T117/1044; Y10T117/1052
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
112 words
APPARATUS FOR PREPARING A THIN, FAT SINGLE CRYSTAL INCLUDING A CRUCIBLE, FIRST HEATING MEANS FOR MAINTAINING THE CONTENTS THEREOF IN MOLTEN STATE, A SUPPORT FOR PULLING A CRYSTAL FROM THE MELT OF THE CRUCIBLE, AN ELECTRICALLY CONDUCTIVE COVER FOR SAID CRUCIBLE MOUNTED ABOVE AND IN SPACED RELATION BUT CLOSE TO THE SURFACE OF SAID MELT, SAID COVER BEING APERTURED TO DEFINE A SHORT PASSAGE OF LONG AND NORROW CROSS-SECTION FOR CONTINUOUS MOVEMENT OF SAID CRYSTAL THERETHROUGH, SECOND MEANS ADJACENT SAID COVER FOR INDUCTIVELY HEATING SAID COVER AND THE ZONE DEFINED BY SAID PASSAGE, AND MEANS FOR MAINTAINING SUBSTANTIALLY CONSTANT THE CLOSELY SPACED RELATION OF THE SURFACE OF THE MELT TO THE COVER.
Claim 2
Dependent Claim
112 words
APPARATUS FOR PREPARING A THIN, FAT SINGLE CRYSTAL INCLUDING A CRUCIBLE, FIRST HEATING MEANS FOR MAINTAINING THE CONTENTS THEREOF IN MOLTEN STATE, A SUPPORT FOR PULLING A CRYSTAL FROM THE MELT OF THE CRUCIBLE, AN ELECTRICALLY CONDUCTIVE COVER FOR SAID CRUCIBLE MOUNTED ABOVE AND IN SPACED RELATION BUT CLOSE TO THE SURFACE OF SAID MELT, SAID COVER BEING APERTURED TO DEFINE A SHORT PASSAGE OF LONG AND NORROW CROSS-SECTION FOR CONTINUOUS MOVEMENT OF SAID CRYSTAL THERETHROUGH, SECOND MEANS ADJACENT SAID COVER FOR INDUCTIVELY HEATING SAID COVER AND THE ZONE DEFINED BY SAID PASSAGE, AND MEANS FOR MAINTAINING SUBSTANTIALLY CONSTANT THE CLOSELY SPACED RELATION OF THE SURFACE OF THE MELT TO THE COVER.
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) | 1960-10-07 | 1961-04-08 | 1961-10-08 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1964-10-07 | 1965-04-08 | 1965-10-08 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1968-10-07 | 1969-04-08 | 1969-10-08 | $7700.00 | Window Closed / Lapsed |