US3607138A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method and device for crucible-free floating-zone melting using a variable-diameter heating coil
Assignee: Siemens AG
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Filing: 1968-04-19
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Granted: 1971-09-21
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Expires: 1988-04-19
Abstract
Abstract Method of floating-zone melting includes surrounding a crystalline rod with an annular induction coil of given diameter at an end of the rod having a transition portion tapering outwardly from a seed crystal of considerably smaller thickness than that of the rod, energizing the coil to inductively heat the rod end to molten temperature, and relatively displacing rod and coil along the transition portion and simultaneously gradually increasing the coil diameter. Device for carrying out the foregoing method includes an induction coil of flexible material and a mechanical adjusting device actuable for varying the diameter of the coil.
Inventors
- 👤 Wolfgang Keller
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 09:56
CPC Classifications
C; C30; C30B; C30B13/00; C30B13/16; C30B13/20; Y; Y10; Y10T; Y10T117/00; Y10T117/10; Y10T117/1024; Y10T117/1076; Y10T117/1088
Claims Analysis
Total Claims: 5
Claim 1
Independent Claim
58 words
Method according to claim 1 wherein the seed crystal is aligned with the rod adjacent the end thereof, and which includes melting the end of the rod so as to fuse the rod to the seed crystal and simultaneously form the tapering transition in the rod by energizing the heating coil winding surrounding the end of the rod.
Claim 2
Dependent Claim
70 words
Method according to claim 1, wherein the rod has a substantially rounded portion at the end thereof and which includes aligning the seed crystal with the rod adjacent the substantially rounded end thereof, melting the end of the rod so as to fuse the pod to the seed crystal and simultaneously form the tapering transition in the rod by energizing the heating coil winding surrounding the end of the rod.
Claim 3
Dependent Claim
51 words
Device for carrying out a method of floating-zone melting a crystalline rod comprising an induction heating coil consisting of flexible material, and a mechanical-adjusting device connected to said coil and actuable for applying varying stress to a winding of said coil so as to vary the diameter and circumferential length thereof.
Claim 4
Dependent Claim
32 words
Device according to claim 4 wherein said mechanical adjusting device is a tentering frame, and the ends of said coil winding extend across one another and are secured to said tentering frame.
Claim 5
Dependent Claim
33 words
Device according to claim 5 wherein said tentering frame comprises a pair of bow members pivotable about a common axis, said ends of said coil winding being respectively connected to said bow members.
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) | 1974-09-20 | 1975-03-22 | 1975-09-21 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-09-20 | 1979-03-22 | 1979-09-21 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-09-20 | 1983-03-22 | 1983-09-21 | $7700.00 | Window Closed / Lapsed |