US2989376A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method of producing pure silicon
Assignee: WC Heraus GmbH and Co KG
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Filing: 1954-03-12
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Granted: 1961-06-20
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Expires: 1974-03-12
Abstract
No abstract record available.
Inventors
- 👤 Schaefer Harald
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 21:49
CPC Classifications
C; C01; C01B; C01B33/00; C01B33/02; H; H10; H10P; H10P95/00
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
92 words
THE METHOD OF PRODUCING PURE SILICON COMPRISING AS A FIRST STAGE THE CONTACTING OF A SILICON TETRAHALIDE AND A FIRST PHASE SILICON AT A TEMPERATURE BETWEEN 700*C. AND 2000*C. AND A PRESSURE BETWEEN 1 MM. HG., AND ABOUT 15,000 MM. HG., PASSING THE REACTION PRODUCT OF SAID SILICON TETRAHALIDE AND SAID SILICON INTO A SECOND STAGE UNDER A TEMPERATURE BELOW THE FIRST STAGE TEMPERATURE, WHEREIN THE REACTION PRODUCT IS REFORMED INTO A SILICON TETRAHALIDE AND A SECOND PHASE SILICON, SAID SECOND PHASE SILICON BEING OF HIGHER PURITY THAN SAID FIRST PHASE SILICON.
Claim 2
Independent Claim
92 words
THE METHOD OF PRODUCING PURE SILICON COMPRISING AS A FIRST STAGE THE CONTACTING OF A SILICON TETRAHALIDE AND A FIRST PHASE SILICON AT A TEMPERATURE BETWEEN 700*C. AND 2000*C. AND A PRESSURE BETWEEN 1 MM. HG., AND ABOUT 15,000 MM. HG., PASSING THE REACTION PRODUCT OF SAID SILICON TETRAHALIDE AND SAID SILICON INTO A SECOND STAGE UNDER A TEMPERATURE BELOW THE FIRST STAGE TEMPERATURE, WHEREIN THE REACTION PRODUCT IS REFORMED INTO A SILICON TETRAHALIDE AND A SECOND PHASE SILICON, SAID SECOND PHASE SILICON BEING OF HIGHER PURITY THAN SAID FIRST PHASE SILICON.
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) | 1964-06-19 | 1964-12-19 | 1965-06-20 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1968-06-19 | 1968-12-19 | 1969-06-20 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1972-06-19 | 1972-12-19 | 1973-06-20 | $7700.00 | Window Closed / Lapsed |