US2872299A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Preparation of reactive materials in a molten non-reactive lined crucible
Assignee: RCA Corp
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Filing: 1954-11-30
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Granted: 1959-02-03
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Expires: 1974-11-30
Abstract
No abstract record available.
Inventors
- 👤 Philip R Celmer
- 👤 Robert V Jensen
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 15:17
CPC Classifications
F; F27; F27B; F27B14/00; F27B14/08; B; B01; B01J; B01J6/00; B01J6/005; C; C01; C01B; C01B33/00; C01B33/02; C30; C30B; C30B15/00; C30B15/10; F27B14/10; F27B2014/002; F27M; F27M2001/00; F27M2001/03; Y; Y10; Y10S; Y10S117/00; Y10S117/90; Y10T; Y10T117/00; Y10T117/10; Y10T117/1024; Y10T117/1032
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
96 words
IN THE CZOCHRALSKI METHOD OF GROWING SINGLE CRYSTALS OF SILLICON, THE METHOD OF PREVENTING REACTION BETWEEN SILICON AND CRUCIBLE MATERIALS COMPRISING THE STEPS OF: PROVIDING A GRAPHITE CRUCIBLE TO HOLD SAID SILICON WITH AN INTERNAL LINING OF A MATERIAL NON-REACTIVE WITH SAID SILICON AND WHOSE DENSITY IS GREATYER THAN THE DENSITY OF SAID SILICON AND WHYOSE MELTING POINT IS LOWER AND WHOSE BOILING POINT IS HIGHER THAN THE MELTING POINTS OF SAID SILICON, HEATING SAID CRUCIBLE SO THAT SAID LINING BECOMES MOLTEN, ROTATING SAID CRUCIBLE WHILE FEEDING SAID SILICON THEREINTO WHEREUPON SAID SILICON BECOMES MOLTEN, SAID
Claim 2
Dependent Claim
96 words
IN THE CZOCHRALSKI METHOD OF GROWING SINGLE CRYSTALS OF SILLICON, THE METHOD OF PREVENTING REACTION BETWEEN SILICON AND CRUCIBLE MATERIALS COMPRISING THE STEPS OF: PROVIDING A GRAPHITE CRUCIBLE TO HOLD SAID SILICON WITH AN INTERNAL LINING OF A MATERIAL NON-REACTIVE WITH SAID SILICON AND WHOSE DENSITY IS GREATYER THAN THE DENSITY OF SAID SILICON AND WHYOSE MELTING POINT IS LOWER AND WHOSE BOILING POINT IS HIGHER THAN THE MELTING POINTS OF SAID SILICON, HEATING SAID CRUCIBLE SO THAT SAID LINING BECOMES MOLTEN, ROTATING SAID CRUCIBLE WHILE FEEDING SAID SILICON THEREINTO WHEREUPON SAID SILICON BECOMES MOLTEN, SAID
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) | 1962-02-02 | 1962-08-04 | 1963-02-03 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1966-02-02 | 1966-08-04 | 1967-02-03 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1970-02-02 | 1970-08-04 | 1971-02-03 | $7700.00 | Window Closed / Lapsed |