US4650540A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Methods and apparatus for producing coherent or monolithic elements
Assignee: Individual
•
Filing: 1983-12-27
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Granted: 1987-03-17
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Expires: 2003-12-27
Abstract
Abstract Methods and apparatus for producing coherent or monolithic elements, such as mono-crystalline semi-conductor rods, preferably by growing or drawing one or more such elements upwardly from an off-center portion of a molten pool in the top of a cake of material while rotating the cake and/or rod or rods, for example, in the same direction and at the same rate; heat balancing the element as it is grown from the pool and maintaining the rod-pool location positioned relative to heating means, as by adding additional materials to the pool as the element is withdrawn; and/or providing relative feeding movement between the cake and rod; and providing a chilled mold beneath the cake.
Inventors
- 👤 Milton Stoll
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 09:26
CPC Classifications
C; C30; C30B; C30B15/00; C30B15/02; C30B15/002; C30B15/005; C30B15/30; Y; Y10; Y10T; Y10T117/00; Y10T117/10; Y10T117/1024; Y10T117/1032; Y10T117/1052; Y10T117/1072
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
114 words
In a method of forming crystalline material into substantially mono-crystalline rods wherein a pool of molten crystalline material is rotated about a generally vertical axis, and a substantially mono-crystalline rod is withdrawn upwardly from the surface of the pool so that material from the pool crystallizes at the interface therebetween to elongate the crystal structure of the rod, the improvement comprising the step of rotating the rod at substantially the same rotational velocity and in the same direction about a generally vertical axis substantially parallel to and off-center from the rotational axis of the pool so that the relative motion at the pool-rod interface is substantially uniform across the entire face of the rod.
Claim 2
Dependent Claim
114 words
In a method of forming crystalline material into substantially mono-crystalline rods wherein a pool of molten crystalline material is rotated about a generally vertical axis, and a substantially mono-crystalline rod is withdrawn upwardly from the surface of the pool so that material from the pool crystallizes at the interface therebetween to elongate the crystal structure of the rod, the improvement comprising the step of rotating the rod at substantially the same rotational velocity and in the same direction about a generally vertical axis substantially parallel to and off-center from the rotational axis of the pool so that the relative motion at the pool-rod interface is substantially uniform across the entire face of the rod.
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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) | 1990-03-16 | 1990-09-15 | 1991-03-17 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1994-03-16 | 1994-09-15 | 1995-03-17 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1998-03-16 | 1998-09-15 | 1999-03-17 | $7700.00 | Window Closed / Lapsed |