Patent US2908004A successfully refreshed from Google Patents.
US2908004A
Expired / Lapsed
US
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Temperature control for crystal pulling
Assignee: Individual
•
Filing: 1957-05-10
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Granted: 1959-10-06
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Expires: 1977-05-10
Abstract
No abstract record available.
Inventors
- 👤 Levinson John
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 19:26
CPC Classifications
C; C30; C30B; C30B15/00; C30B15/20; C30B15/22; C30B15/28; Y; Y10; Y10T; Y10T117/00; Y10T117/10; Y10T117/1004; Y10T117/1008; Y10T117/1024; Y10T117/1032; Y10T117/1068
Claims Analysis
Total Claims: 1
Claim 1
Independent Claim
97 words
AN APPARATUS FOR GROWING CRYSTALS COMPRISING MEANS FOR HEATING A BODY OF MELTED MATERIALS, A SEED CRYSTAL TO BE INSERTED INTO THE MELTED MATERIAL, MEANS WITHDRAWING THE SEED CRYSTAL FROM THE BODY OF MELTED MATERIAL AT A CONSTANT RATE, MEANS FOR WEIGHING THE CRYSTAL FORMED ON THE SEED CRYSTAL, MEANS RESPONSIVE TO THE SAID WEIGHING MEANS FOR PRODUCING A VOLTAGE PROP TIONAL TO THE RATE OF GROWTH OF THE CRYSTAL AND MEANS RESPONSIVE TO THE SAID VOLTAGE TO CONTROL THE HEAT OF THE SAID HEATING MEANS WHEREBY TH ERATE OF GROWTH OF SAID CRYSTAL IS MAINTAINED CONSTANT.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1962-10-05 | 1963-04-06 | 1963-10-06 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1966-10-05 | 1967-04-06 | 1967-10-06 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1970-10-05 | 1971-04-06 | 1971-10-06 | $7700.00 | Window Closed / Lapsed |