US2909411A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Production of silicon
Assignee: EIDP Inc
•
Filing: 1957-01-15
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Granted: 1959-10-20
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Expires: 1977-01-15
Abstract
No abstract record available.
Inventors
- 👤 Krchma Ignace Joseph
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 23:54
CPC Classifications
C; C01; C01B; C01B33/00; C01B33/02; C01B33/021; C01B33/027; C01B33/033
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
160 words
IN A PROCESS FOR PRODUCING ELEMENTAL SILICON OF HYPERPURITY BY PASSING SILICON HALIDE VAPORS AND VAPORS OF A REDUCTANT METAL SELECTED FROM THE GROUP CONSISTING OF ZINC AND CADMIUM INTO AN ENCLOSED REDUCTION REACTION ZONE MAINTAINED AT A TEMPERATURE ABOVE THE BOILING POINT OF THE REDUCTANT METAL AND BELOW THE MELTING POINT OF SILICON, WHEREUPON A REDUCTION REACTION TAKES PLACE TO DEPOSIT SILICON IN SAID REACTION ZONE, THE IMPROVEMENT WHICH COMPRISES MAINTAINING AN ENCLOSED PURIFICATION ZONE IN COMMUNICATION WITH THE ENTRANCE TO SAID REDUCTION REACTION ZONE, SAID PURIFICATION ZONE BEING PARTIALLY FILLED WITH A POOL OF BOILING REDUCTANT METAL SUPPLYING VAPORS TO THE REDUCTION REACTION ZONE, INTRODUCING INTO THE PURIFICATION ZONE MOLTEN REDUCTANT METAL AT A RATE SUFFICIENT TO MAINTAIN THE POOL OF BOILING REDUCTANT METAL WHILE PASSING A STREAM OF SILICON HALIDE VAPORS AT A TEMPERATURE OF AT LEAST 600*C. THROUGH SAID PURIFICATION ZONE TO INTERMINGLE WITH REDUCTANT METAL BEFORE PASSING SAID HALIDE VAPORS INTO THE REDUCTION REACTION ZONE.
Claim 2
Dependent Claim
160 words
IN A PROCESS FOR PRODUCING ELEMENTAL SILICON OF HYPERPURITY BY PASSING SILICON HALIDE VAPORS AND VAPORS OF A REDUCTANT METAL SELECTED FROM THE GROUP CONSISTING OF ZINC AND CADMIUM INTO AN ENCLOSED REDUCTION REACTION ZONE MAINTAINED AT A TEMPERATURE ABOVE THE BOILING POINT OF THE REDUCTANT METAL AND BELOW THE MELTING POINT OF SILICON, WHEREUPON A REDUCTION REACTION TAKES PLACE TO DEPOSIT SILICON IN SAID REACTION ZONE, THE IMPROVEMENT WHICH COMPRISES MAINTAINING AN ENCLOSED PURIFICATION ZONE IN COMMUNICATION WITH THE ENTRANCE TO SAID REDUCTION REACTION ZONE, SAID PURIFICATION ZONE BEING PARTIALLY FILLED WITH A POOL OF BOILING REDUCTANT METAL SUPPLYING VAPORS TO THE REDUCTION REACTION ZONE, INTRODUCING INTO THE PURIFICATION ZONE MOLTEN REDUCTANT METAL AT A RATE SUFFICIENT TO MAINTAIN THE POOL OF BOILING REDUCTANT METAL WHILE PASSING A STREAM OF SILICON HALIDE VAPORS AT A TEMPERATURE OF AT LEAST 600*C. THROUGH SAID PURIFICATION ZONE TO INTERMINGLE WITH REDUCTANT METAL BEFORE PASSING SAID HALIDE VAPORS INTO THE REDUCTION REACTION ZONE.
References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1962-10-19 | 1963-04-20 | 1963-10-20 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1966-10-19 | 1967-04-20 | 1967-10-20 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1970-10-19 | 1971-04-20 | 1971-10-20 | $7700.00 | Window Closed / Lapsed |