US3625660A
Expired / Lapsed
US
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Method and structure for growing crystals
Assignee: Massachusetts Institute of Technology
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Filing: 1968-03-18
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Granted: 1971-12-07
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Expires: 1988-03-18
Abstract
Abstract A MELT OR PUDDLE IS FORMED IN A SOLID MATERIAL CONTAINED IN A COLD CRUCIBLE. THE SOLID MATERIAL ACTS AS A SELF-CRUCIBLE FOR THE MELT AND CRYSTALS ARE GROWN AT THE CENTER OF THE MELT. THE MELT IS FORMED IN THE SOLID MATERIAL BY A MULTITUDE OF ARCS STRUCK BETWEEN THE MATERIAL WHICH MAY ACT AS AN ANODE, AND A MULTITUDE OF CATHODES WHICH ARE DIRECTED TOWARD THE MATERIAL, SO THAT THE ELECTRON AND PLASMA FLOW FROM THE CATHODES TO THE MATERIAL, PRODUCES AND MAINTAINS THE MELT.
Inventors
- 👤 Thomas B Reed
- 👤 Edward R Pollard
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 06:23
CPC Classifications
C; C30; C30B; C30B15/00; C30B15/30; C30B15/305; C30B15/14; C30B15/16; Y; Y10; Y10S; Y10S117/00; Y10S117/90; Y10S117/901; Y10S117/902; Y10T; Y10T117/00; Y10T117/10; Y10T117/1024; Y10T117/1032; Y10T117/1068
Claims Analysis
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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) | 1974-12-06 | 1975-06-07 | 1975-12-07 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-12-06 | 1979-06-07 | 1979-12-07 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-12-06 | 1983-06-07 | 1983-12-07 | $7700.00 | Window Closed / Lapsed |