US2883269A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Production of elemental silicon
Assignee: EIDP Inc
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Filing: 1955-09-22
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Granted: 1959-04-21
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Expires: 1975-09-22
Abstract
No abstract record available.
Inventors
- 👤 Ignace J Krchma
- 👤 Olson Carl Marcus
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 07:38
CPC Classifications
C; C01; C01B; C01B33/00; C01B33/02; C01B33/021; C01B33/027; C01B33/033
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
147 words
A PROCESS FOR THE MANUFACTURE OF ELEMENTAL SILICON OF IMPROVED PURITY WHICH COMPRISES PASSING THROUGH A FIRST REACTION ZONE THE VAPORS OF A SILICON HALIDE CONTAINING TRACE IMPURITIES AND THE VAPORS OF A REDUCING METAL CONTAINING TRACE IMPURITIES, SAID METAL BEING SELECTED FROM THE GROUP CONSISTING OF ZINC AND CADMIUM, REACTING A PORTION OF THE PASSING VAPORS AND THEREBY DEPOSITING A PORTION OF THE SILICON AND SUBSTANTIALLY ALL OF THE TRACE IMPURITIES WITHIN SAID FIRST REACTION ZONE, PASSING THE VAPOROUS BY-PRODUCTS OF THE REACTION AND THE UNREACTED VAPORS OF SAID SILICON HALIDE AND SAID REDUCING METAL INTO A SECOND REACTION ZONE, REACTING SAID VAPORS OF SILICON HALIDE AND THE METAL IN SAID SECOND REACTION ZONE THEREBY DEPOSITING SILICON OF IMPROVED PURITY WITHIN SAID SECOND ZONE, AND RECOVERING THE PURER PRODUCT IN SAID SECOND REACTION ZONE SEPARATELY FROM THE PRODUCT OF LESSER PURITY IN THE FIRST REACTION ZONE.
Claim 2
Dependent Claim
147 words
A PROCESS FOR THE MANUFACTURE OF ELEMENTAL SILICON OF IMPROVED PURITY WHICH COMPRISES PASSING THROUGH A FIRST REACTION ZONE THE VAPORS OF A SILICON HALIDE CONTAINING TRACE IMPURITIES AND THE VAPORS OF A REDUCING METAL CONTAINING TRACE IMPURITIES, SAID METAL BEING SELECTED FROM THE GROUP CONSISTING OF ZINC AND CADMIUM, REACTING A PORTION OF THE PASSING VAPORS AND THEREBY DEPOSITING A PORTION OF THE SILICON AND SUBSTANTIALLY ALL OF THE TRACE IMPURITIES WITHIN SAID FIRST REACTION ZONE, PASSING THE VAPOROUS BY-PRODUCTS OF THE REACTION AND THE UNREACTED VAPORS OF SAID SILICON HALIDE AND SAID REDUCING METAL INTO A SECOND REACTION ZONE, REACTING SAID VAPORS OF SILICON HALIDE AND THE METAL IN SAID SECOND REACTION ZONE THEREBY DEPOSITING SILICON OF IMPROVED PURITY WITHIN SAID SECOND ZONE, AND RECOVERING THE PURER PRODUCT IN SAID SECOND REACTION ZONE SEPARATELY FROM THE PRODUCT OF LESSER PURITY IN THE FIRST REACTION ZONE.
References Cited (Backward Citations)
US2773745A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1962-04-20 | 1962-10-20 | 1963-04-21 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1966-04-20 | 1966-10-20 | 1967-04-21 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1970-04-20 | 1970-10-20 | 1971-04-21 | $7700.00 | Window Closed / Lapsed |