Patent EP0346012A1 successfully refreshed from Google Patents.
US3915656A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Apparatus for growing crystalline bodies from the melt
Assignee: Saint Gobain Ceramics and Plastics Inc
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Filing: 1973-08-06
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Granted: 1975-10-28
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Expires: 1993-08-06
Abstract
Abstract The invention is an improved apparatus for producing monocrystalline bodies of alumina (or other materials) that are characterized by varying cross-sections, for example, a sapphire tube having an internal flange. The apparatus comprises a novel die arrangement adapted to support a thin film of melt from which the crystalline body is grown, the die being adjustable to change the configuration of the film and thereby vary the shape of the body being grown.
Inventors
- 👤 Abraham I Mlavsky
- 👤 Nicholas A Pandiscio
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 17:40
CPC Classifications
C; C30; C30B; C30B15/00; C30B15/34; C30B15/005; C30B29/00; C30B29/60; Y; Y10; Y10S; Y10S117/00; Y10S117/901; Y10S117/902; Y10S117/911; Y10T; Y10T117/00; Y10T117/10; Y10T117/102; Y10T117/1024; Y10T117/1032; Y10T117/1036; Y10T117/104; Y10T117/1072
Claims Analysis
Total Claims: 14
Claim 1
Independent Claim
81 words
APPARATUS COMPRISING A CRUCIBLE, A DIE ASSEMBLY EXTENDING INTO SAID CRUCIBLE HAVING A FIRST AND SECOND CONCENTRIC MEMBERS EACH HAVING A SUBSTANTIALLY HORIZONTAL TOP END SURFACE, SAID FIRST MEMBER HAVING AT LEAST ONE PASSAGEWAY THET TERMINATES AT ONE END IN AN ORIFICE IN THE SAID TOP END SURFACE OF SAID FIRST MEMBER AND COMMUNICATES AT THE OPPOSITE END WITH THE INTERIOR OF SAID CRUCIBLE, SAID MEMBERS BEING MOUNTED FOR RELATIVE AXIAL MOVEMENT SO THAT THE SAID TOP END SURFACE OF ONE
Claim 2
Dependent Claim
81 words
APPARATUS COMPRISING A CRUCIBLE, A DIE ASSEMBLY EXTENDING INTO SAID CRUCIBLE HAVING A FIRST AND SECOND CONCENTRIC MEMBERS EACH HAVING A SUBSTANTIALLY HORIZONTAL TOP END SURFACE, SAID FIRST MEMBER HAVING AT LEAST ONE PASSAGEWAY THET TERMINATES AT ONE END IN AN ORIFICE IN THE SAID TOP END SURFACE OF SAID FIRST MEMBER AND COMMUNICATES AT THE OPPOSITE END WITH THE INTERIOR OF SAID CRUCIBLE, SAID MEMBERS BEING MOUNTED FOR RELATIVE AXIAL MOVEMENT SO THAT THE SAID TOP END SURFACE OF ONE
Claim 3
Dependent Claim
21 words
Apparatus according to claim 1 wherein one of said members is stationary and the other of said members is moveable axially.
Claim 4
Dependent Claim
16 words
Apparatus according to claim 1 further including means for causing relative axial movement of said members.
Claim 5
Dependent Claim
13 words
Apparatus according to claim 1 wherein said first member surrounds said second member.
Claim 6
Dependent Claim
31 words
Apparatus according to claim 4 wherein said first member is locked to said crucible and said second member is mounted for axial movement relative to said crucible and said first member.
Claim 7
Dependent Claim
26 words
Apparatus according to claim 5 wherein said second member projects out of the bottom of said crucible, and further including means for moving said second member.
Claim 8
Dependent Claim
16 words
Apparatus according to claim 4 wherein the said end surface of said first member is annular.
Claim 9
Dependent Claim
15 words
Apparatus according to claim 7 wherein said end surface of said second member is annular.
Claim 10
Dependent Claim
18 words
Apparatus according to claim 1 wherein at least part of said die assembly is supported by said crucible.
Claim 11
Dependent Claim
13 words
Apparatus according to claim 1 wherein said second member surrounds said first member.
Claim 12
Dependent Claim
101 words
Apparatus comprising a die assembly having first and second members each having a substantially horizontal surface at a corresponding end thereof, at least one passageway in one of said members that communicates at one point with an orifice in the said surface of said one member and has an inlet at a point below said orifice, means for supporting said die assembly, means for holding a supply of melt in communication with said inlet, and means for moving one of said members relative to the other so as to move said surfaces into and out of horizontal alignment with each other.
Claim 13
Dependent Claim
101 words
Apparatus comprising a die assembly having first and second members each having a substantially horizontal surface at a corresponding end thereof, at least one passageway in one of said members that communicates at one point with an orifice in the said surface of said one member and has an inlet at a point below said orifice, means for supporting said die assembly, means for holding a supply of melt in communication with said inlet, and means for moving one of said members relative to the other so as to move said surfaces into and out of horizontal alignment with each other.
Claim 14
Dependent Claim
13 words
Apparatus according to claim 11 further including means for heating said die assembly.
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) | 1978-10-27 | 1979-04-28 | 1979-10-28 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-10-27 | 1983-04-28 | 1983-10-28 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-10-27 | 1987-04-28 | 1987-10-28 | $7700.00 | Window Closed / Lapsed |