US3622282A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method for producing a monocrystalline rod by crucible-free floating zone melting
Assignee: Siemens AG
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Filing: 1967-12-19
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Granted: 1971-11-23
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Expires: 1987-12-19
Abstract
Abstract Method for producing a monocrystalline rod, such as a semiconductor rod, by crucible-free zone melting includes heating to melting temperature and end of at least two supply rod portions of given material supplied at spaced locations to a melting zone of the material, and additionally heating the melting zone with at least one additional heat source disposed within the space between the supply rod portions being supplied to the melting zone.
Inventors
- 👤 Wolfgang Keller
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 04:49
CPC Classifications
C; C30; C30B; C30B13/00; C30B13/16; C30B13/20; Y; Y10; Y10S; Y10S117/00; Y10S117/91; Y10S117/912; Y10T; Y10T117/00; Y10T117/10; Y10T117/1024; Y10T117/1032; Y10T117/1072
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
24 words
Method according to claim 1 wherein said heating to melting temperature is by induction, and said heat source comprises an electrically conductive heating loop.
Claim 2
Dependent Claim
27 words
Method according to claim 2 wherein the inductive heating is effected by a plurality of electrically conductive heating loops having axes inclined with respect to one another.
Claim 3
Dependent Claim
58 words
Method according to claim 1 which comprises placing at least two electrically conductive heating loops substantially around, respectively, each of the supply rod portions being supplied to the melting zone, said additional heat source disposed within the space between the supply rod portions being formed of parts of said two heating loops substantially surrounding the respective rod portions.
Claim 4
Dependent Claim
56 words
Method according to claim 2 wherein said inductive heating is effected by at least two elongated U-shaped inductive windings respectively disposed substantially in a semicircle about the rod portions being supplied to the melt, said heating loop disposed within the space between the supply rod portions being formed of parts of said two U-shaped inductive windings.
Claim 5
Dependent Claim
63 words
Method according to claim 1 wherein said first-mentioned heating step comprises heating the ends of the supply rod portions with at least one conductive heating loop, and said additional heating step comprises heating the melting zone between the supply rod portions with an additional conductive heating loop, separately energizable from said one heating loop, disposed within the space between the supply rod portions.
Claim 6
Dependent Claim
68 words
Method according to claim 1 wherein said first-mentIoned heating step comprises heating the ends of the supply rod portions with conductive heating loops, and said additional heating step comprises heating the melting zone between the supply rod portions with an additional conductive heating loop disposed within the space between the supply rod portions at a location closer to the melting zone than said first mentioned conductive heating loops.
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) | 1974-11-22 | 1975-05-24 | 1975-11-23 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-11-22 | 1979-05-24 | 1979-11-23 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-11-22 | 1983-05-24 | 1983-11-23 | $7700.00 | Window Closed / Lapsed |