US4055391A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Crucible
Assignee: Rio Tinto Switzerland AG
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Filing: 1976-02-26
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Granted: 1977-10-25
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Expires: 1996-02-26
Abstract
Abstract A crucible, especially for containing melts, has a multichamber construction wherein there is an outer chamber for containing a heat distribution medium and an inner chamber which acts as a receptacle for the melt.
Inventors
- 👤 Walter Schmidt
- 👤 Walter Stahlin
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 22:40
CPC Classifications
F; F27; F27B; F27B14/00; F27B14/08; F27B14/14; C; C30; C30B; C30B15/00; C30B15/10; F27B14/06; F27B14/061; F27B14/10; Y; Y10; Y10S; Y10S117/00; Y10S117/90; Y10T; Y10T117/00; Y10T117/10; Y10T117/1024; Y10T117/1032; Y10T117/1068
Claims Analysis
Total Claims: 12
Claim 1
Independent Claim
101 words
A crucible, for use in heating a melt, comrising in combination, an outer wall and an inner wall of iridium defining an inner chamber to receive said melt; said outer and inner walls defining therebetween an outer chamber operable to receive a heat distribution medium at least partially filling said outer chamber and having a melting point above about 1500° C and which is below the melting point of said melt and a boiling point above about 1750° C which is above the melting point of said melt, said inner body separating said chambers preventing direct liquid communication between said chambers.
Claim 2
Dependent Claim
101 words
A crucible, for use in heating a melt, comrising in combination, an outer wall and an inner wall of iridium defining an inner chamber to receive said melt; said outer and inner walls defining therebetween an outer chamber operable to receive a heat distribution medium at least partially filling said outer chamber and having a melting point above about 1500° C and which is below the melting point of said melt and a boiling point above about 1750° C which is above the melting point of said melt, said inner body separating said chambers preventing direct liquid communication between said chambers.
Claim 3
Dependent Claim
27 words
A crucible, as claimed in claim 1 wherein said heat distribution medium is a silicate with a melting point from about 1500° C to about 1600° C.
Claim 4
Dependent Claim
12 words
A crucible, as claimed in claim 2, wherein said medium comprises anorthite.
Claim 5
Dependent Claim
12 words
A crucible, as claimed in claim 2, wherein said medium comprises wollastonite.
Claim 6
Dependent Claim
24 words
A crucible, as claimed in claim 1, further comprising a cover means operable to close at least partially the top of said outer chamber.
Claim 7
Dependent Claim
24 words
A crucible, as claimed in claim 5, said cover means having at least one opening for filling or removing material from said outer chamber.
Claim 8
Dependent Claim
65 words
A crucible, as claimed in claim 1, said outer wall comprising an outer substantially cylindrical tube; said inner wall comprising an inner substantially cylindrical tube of smaller diameter than said outer tube and being disposed within and spaced apart from said outer wall; and a bottom plate, said cylindrical tubes being secured in liquid tight manner to said bottom plate to form said outer chamber.
Claim 9
Dependent Claim
18 words
A crucible, as claimed in claim 7, said outer wall and said bottom plate comprising the same material.
Claim 10
Dependent Claim
48 words
A Czochralski crystal-pulling apparatus wherein the melt crucible is hollow-walled and the walls of said crucible contain a substantially non-reactive heat transfer substance having a melting point above about 1500° C and a boiling point above about 1750° C, said crucible being a crucible according to claim 1.
Claim 11
Dependent Claim
20 words
Apparatus according to claim 1, wherein the space between said walls is sufficient to permit convection currents to flow therein.
Claim 12
Dependent Claim
14 words
Apparatus according to claim 1, wherein said heat transfer substance is a melted substance.
References Cited (Backward Citations)
US1838357A
Cited
US1895421A
Cited
FR726993A
Cited
US2665223A
Cited
US3491992A
Cited
US3470017A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1980-10-24 | 1981-04-25 | 1981-10-25 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1984-10-24 | 1985-04-25 | 1985-10-25 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1988-10-24 | 1989-04-25 | 1989-10-25 | $7700.00 | Window Closed / Lapsed |