US2998335A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method and apparatusfor growing single crystals from molten bodies
Assignee: Telefunken AG
•
Filing: 1957-01-31
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Granted: 1961-08-29
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Expires: 1977-01-31
Abstract
No abstract record available.
Inventors
- 👤 Dehmelt Friedrich Wilhelm
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 15:49
CPC Classifications
C; C30; C30B; C30B15/00; C30B15/02; Y; Y10; Y10S; Y10S65/00; Y10S65/04
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
130 words
A METHOD FOR OBTAINING A SINGLE CRYSTAL FROM A MELT WITH THE AID OF A SEED CRYSTAL, COMPRISING THE STEPS OF PLACING A SEMI-CONDUCTOR STARTING MATERIAL IN THE FORM OF A BAR IN A CRUCIBLE, MELTING SAID BAR SO AS TO ESTABLISH A MELTING ZONE IN THE UPPER CROSS-SECTIONAL REGION OF THE BAR, CONTACTING SAID UPPER CROSS-SECTIONAL REGION OF THE BAR WITH A SEED CRYSTAL, MOVING SAID MELTING ZONE DOWNWARDLY ALONG SAID BAR AT A CONSTANT SPEED, AND WITHDRAWING SAID SEED CRYSTAL BY MOVING THE SAME UPWARDLY AT A CONSTANT SPEED TOGETHER WITH A NEW CRYSTAL PORTION ADHERING THERETO, SAID WITHDRAWAL OF SAID CRYSTAL BEING CONCURRENT WITH THE MOVEMENT OF SAID MELTING ZONE, WHEREBY THE CRYSTAL WITHDRAWN FROM THE MELT IS OUT OF CONTACT WITH THE WALLS OF THE CRUCIBLE.
Claim 2
Independent Claim
130 words
A METHOD FOR OBTAINING A SINGLE CRYSTAL FROM A MELT WITH THE AID OF A SEED CRYSTAL, COMPRISING THE STEPS OF PLACING A SEMI-CONDUCTOR STARTING MATERIAL IN THE FORM OF A BAR IN A CRUCIBLE, MELTING SAID BAR SO AS TO ESTABLISH A MELTING ZONE IN THE UPPER CROSS-SECTIONAL REGION OF THE BAR, CONTACTING SAID UPPER CROSS-SECTIONAL REGION OF THE BAR WITH A SEED CRYSTAL, MOVING SAID MELTING ZONE DOWNWARDLY ALONG SAID BAR AT A CONSTANT SPEED, AND WITHDRAWING SAID SEED CRYSTAL BY MOVING THE SAME UPWARDLY AT A CONSTANT SPEED TOGETHER WITH A NEW CRYSTAL PORTION ADHERING THERETO, SAID WITHDRAWAL OF SAID CRYSTAL BEING CONCURRENT WITH THE MOVEMENT OF SAID MELTING ZONE, WHEREBY THE CRYSTAL WITHDRAWN FROM THE MELT IS OUT OF CONTACT WITH THE WALLS OF THE CRUCIBLE.
References Cited (Backward Citations)
US1937065A
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US2375107A
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US2493951A
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FR1127036A
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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) | 1964-08-28 | 1965-02-27 | 1965-08-29 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1968-08-28 | 1969-02-27 | 1969-08-29 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1972-08-28 | 1973-02-27 | 1973-08-29 | $7700.00 | Window Closed / Lapsed |