US3773499A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method of zonal melting of materials
Assignee: Individual
•
Filing: 1968-04-03
•
Granted: 1973-11-20
•
Expires: 1988-04-03
Abstract
Abstract A method of zonal melting of materials without a crucible comprises the following steps: placing a layer of unrefined material upon the circumferential surface of a previously molten ingot of refined material; and zonal melting of the layer and ingot together in the course of which a floating zone is embedded to a predetermined depth of the initial ingot, thereby increasing the circumferential diameter of the ingot.
Inventors
- 👤 M Melnikov
- 👤 A Kakabadze
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 13:04
CPC Classifications
C; C30; C30B; C30B13/00; C30B13/06
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
32 words
A method as claimed in claim 1, wherein the applying of the layer of unrefined material and of conducting zonal melting of the layer are repeated several times for the same ingot.
Claim 2
Dependent Claim
19 words
A method as claimed in claim 1, wherein the zonal melting is effected simultaneously in a plurality of zones.
Claim 3
Dependent Claim
21 words
A method as claimed in claim 3, wherein the depth of the floating zones in the zonal melting zones is different.
Claim 4
Dependent Claim
23 words
A method as claimed in claim 1, wherein the initial ingot is constituted as a monocrystal and is usEd to obtain monocrystalline ingots.
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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) | 1976-11-19 | 1977-05-21 | 1977-11-20 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-11-19 | 1981-05-21 | 1981-11-20 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-11-19 | 1985-05-21 | 1985-11-20 | $7700.00 | Window Closed / Lapsed |