US3877880A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Crystal melting apparatus fashioned to eliminate bubbles entrapped in the melt
Assignee: KUHLMANN SCHAFER WILHELM
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Filing: 1972-07-21
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Granted: 1975-04-15
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Expires: 1992-07-21
Abstract
Abstract An improved melting apparatus, preferably a zone melting apparatus, wherein the surface of a current traversed body has the form of a bowl or pot in the melting region wherein a substance to be melted and the body surface are contacted. This apparatus aids in the elimination of entrapped bubbles in the melted and subsequently solidified substance.
Inventors
- 👤 Wilhelm Kuhlmann-Schafer
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 18:34
CPC Classifications
C; C30; C30B; C30B13/00; C30B13/16; C30B13/18; C30B29/00; C30B29/60; C30B29/66; Y; Y10; Y10T; Y10T117/00; Y10T117/10; Y10T117/1024; Y10T117/1076; Y10T117/108
Claims Analysis
Total Claims: 9
Claim 1
Independent Claim
84 words
AN APPARATUS FOR ZONE MELTING A SUBSTANCE COMPRISING IN COMBINATION: A SUBSTANTIALLY PLANAR, STRIP MEMBER HAVING AN OPENING THERETHROUGH; SIDE WALLS EXTENDING TRANSVERSELY FROM SAID STRIP MEMBER AND ENCLOSING SAID OPENING; A SIEVE MEMBER SECURED TO SAID SIDE WALLS, SAID SIDE WALLS AND SIEVE MEMBER DEFINING A POT-SHAPED CAVITY FOR RECEIPT OF SAID SUBSTANCE; AND MEANS FOR PASSING A CURRENT THROUGH SAID STRIP MEMBER, SIDE WALLS AND SIEVE MEMBER TO RESISTANTLY HEAT SAID SIDE WALLS AND SIEVE MEMBER, SAID SIDE WALLS, SIEVE MEMBER AND
Claim 2
Independent Claim
84 words
AN APPARATUS FOR ZONE MELTING A SUBSTANCE COMPRISING IN COMBINATION: A SUBSTANTIALLY PLANAR, STRIP MEMBER HAVING AN OPENING THERETHROUGH; SIDE WALLS EXTENDING TRANSVERSELY FROM SAID STRIP MEMBER AND ENCLOSING SAID OPENING; A SIEVE MEMBER SECURED TO SAID SIDE WALLS, SAID SIDE WALLS AND SIEVE MEMBER DEFINING A POT-SHAPED CAVITY FOR RECEIPT OF SAID SUBSTANCE; AND MEANS FOR PASSING A CURRENT THROUGH SAID STRIP MEMBER, SIDE WALLS AND SIEVE MEMBER TO RESISTANTLY HEAT SAID SIDE WALLS AND SIEVE MEMBER, SAID SIDE WALLS, SIEVE MEMBER AND
Claim 3
Dependent Claim
22 words
An apparatus as claimed in claim 1 wherein said sieve member is dome-shaped and converges in sharp edges with said side walls.
Claim 4
Dependent Claim
12 words
An apparatus as claimed in claim 1 wherein said opening is annular.
Claim 5
Dependent Claim
146 words
In an apparatus for purifying a substance including a substantially planar, strip member having a perforated region and means for passing a current through said strip member to heat said perforated region, said substance being placed in direct physical contact with said perforated region whereby said substance melts, passes through said perforated region and is subsequently solidified, the improvement comprising side walls for said perforated region extending transversely from said strip member and enclosing said perforated region to define a pot-shaped cavity for receipt of said substance, said side walls being heated by said current, said strip member, side walls, and current means cooperatively defining means for conductively heating said substance to produce a zone of molten substances within said pot-shaped cavity, whereby gas bubbles in said zone are permitted to migrate upwardly to avoid the entrapment of said gas bubbles in said subsequently solidified substance.
Claim 6
Dependent Claim
146 words
In an apparatus for purifying a substance including a substantially planar, strip member having a perforated region and means for passing a current through said strip member to heat said perforated region, said substance being placed in direct physical contact with said perforated region whereby said substance melts, passes through said perforated region and is subsequently solidified, the improvement comprising side walls for said perforated region extending transversely from said strip member and enclosing said perforated region to define a pot-shaped cavity for receipt of said substance, said side walls being heated by said current, said strip member, side walls, and current means cooperatively defining means for conductively heating said substance to produce a zone of molten substances within said pot-shaped cavity, whereby gas bubbles in said zone are permitted to migrate upwardly to avoid the entrapment of said gas bubbles in said subsequently solidified substance.
Claim 7
Dependent Claim
15 words
An improvement as claimed in claim 4 wherein said perforated region is an annular region.
Claim 8
Dependent Claim
16 words
An improvement as claimed in claim 4 wherein said perforated region is an elongated, rectangular region.
Claim 9
Dependent Claim
13 words
An improvement as claimed in claim 4 wherein said side walls are insulated.
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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) | 1978-04-14 | 1978-10-14 | 1979-04-15 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-04-14 | 1982-10-14 | 1983-04-15 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-04-14 | 1986-10-14 | 1987-04-15 | $7700.00 | Window Closed / Lapsed |