Patent US3148131A successfully refreshed from Google Patents.
US3148131A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Process for the purification of silicon
Assignee: Pechiney SA
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Filing: 1961-03-29
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Granted: 1964-09-08
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Expires: 1981-03-29
Abstract
No abstract record available.
Inventors
- 👤 Coursier Jacques
- 👤 Moutach Michel
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-07 11:48
CPC Classifications
C; C01; C01B; C01B33/00; C01B33/02; C01B33/037
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
94 words
IN A PROCESS FOR THE PRODUCTION OF A PURIFIED SILICON FROM AN IMPURE SILICON, THE STEPS OF TREATING THE IMPURE SILICON WITH THE FLUORIDE OF AT LEST ONE OF THE METALS SELECTED FROM THE GROUP CONSISTING OF SILVER, CAESIUM LEAD, THALLIUM, ALUMINUM, COPPER, CADMIUM, GALLIUM, TITATIUM AND ZINC AND A METAL SELECTED FROM THE GROUP CONSISTING OF SILVER, CASEIUM, LEAD, THALLIUM, ALUMINUM, COPPER, CADMIUM, GALLIUM, TITANIUM AND ZINC, AT A TEMPERATURE ABOVE THE MELTING POINT TEMPERATURES FOR THE METAL FLUORIDE, AND ELECTROLYTICALLY SEPARTING THE MATERIALS FORMED DURING THE TREATING STEP FROM THE PURIFIED SILICON.
Claim 2
Dependent Claim
94 words
IN A PROCESS FOR THE PRODUCTION OF A PURIFIED SILICON FROM AN IMPURE SILICON, THE STEPS OF TREATING THE IMPURE SILICON WITH THE FLUORIDE OF AT LEST ONE OF THE METALS SELECTED FROM THE GROUP CONSISTING OF SILVER, CAESIUM LEAD, THALLIUM, ALUMINUM, COPPER, CADMIUM, GALLIUM, TITATIUM AND ZINC AND A METAL SELECTED FROM THE GROUP CONSISTING OF SILVER, CASEIUM, LEAD, THALLIUM, ALUMINUM, COPPER, CADMIUM, GALLIUM, TITANIUM AND ZINC, AT A TEMPERATURE ABOVE THE MELTING POINT TEMPERATURES FOR THE METAL FLUORIDE, AND ELECTROLYTICALLY SEPARTING THE MATERIALS FORMED DURING THE TREATING STEP FROM THE PURIFIED SILICON.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1967-09-08 | 1968-03-09 | 1968-09-08 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1971-09-08 | 1972-03-09 | 1972-09-08 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1975-09-08 | 1976-03-09 | 1976-09-08 | $7700.00 | Window Closed / Lapsed |