US2955024A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Process for making purified silicon from silicon-containing substances
Assignee: OI Glass Inc
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Filing: 1956-03-26
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Granted: 1960-10-04
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Expires: 1976-03-26
Abstract
No abstract record available.
Inventors
- 👤 William E Smith
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 14:16
CPC Classifications
C; C01; C01B; C01B33/00; C01B33/02
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
130 words
A PROCESS FOR FORMING PURE ELEMENTAL SILICON CRYSTALS OF FROM 80-200 MESH SIZE COMPRISING MIXING A PREDETERMINED AMOUNT OF MOLTEN SILICON-CONTAINING GLASS WITH MOLTEN ALUMINUM TO FORM AN ALUMINUM-SILICON ALLOY MELT CONSISTING ESSENTIALLY OF AT LEAST THREE PARTS BY WEIGHT OF ALUMINUM FOR EACH PART BY WEIGHT OF SILICON LOWERING THE TEMPERATURE OF SAID ALLOY MELT TO ABOUT 1100-1250* F. AND MAINTAINING SAID TEMPERATURE FOR A PERIOD OF FROM 6 TO 48 HOURS, SEPARATING THE FORMED SILICON CRYSTALS THEREFROM, TREATING SAID CRYSTALS WITH A MINERAL ACID TO REMOVE ALUMINUS IMPURITIES THEREFROM, SUBJECTING SAID CRYSTALS TO A FLOTATION TREATMENT IN AN AQUEOUS SOLUTION CONTAINING A FLOTATION REAGENT SELECTED FROM THE GROUP CONSISTING OF HYDROFLUORIC ACID AND A SODIUM FLUORIDEHYDROCHLORIC ACID MIX, AND REMOVING SAID PURE SILICON CRYSTALS FROM THE FLOTATION SOLUTION.
Claim 2
Dependent Claim
130 words
A PROCESS FOR FORMING PURE ELEMENTAL SILICON CRYSTALS OF FROM 80-200 MESH SIZE COMPRISING MIXING A PREDETERMINED AMOUNT OF MOLTEN SILICON-CONTAINING GLASS WITH MOLTEN ALUMINUM TO FORM AN ALUMINUM-SILICON ALLOY MELT CONSISTING ESSENTIALLY OF AT LEAST THREE PARTS BY WEIGHT OF ALUMINUM FOR EACH PART BY WEIGHT OF SILICON LOWERING THE TEMPERATURE OF SAID ALLOY MELT TO ABOUT 1100-1250* F. AND MAINTAINING SAID TEMPERATURE FOR A PERIOD OF FROM 6 TO 48 HOURS, SEPARATING THE FORMED SILICON CRYSTALS THEREFROM, TREATING SAID CRYSTALS WITH A MINERAL ACID TO REMOVE ALUMINUS IMPURITIES THEREFROM, SUBJECTING SAID CRYSTALS TO A FLOTATION TREATMENT IN AN AQUEOUS SOLUTION CONTAINING A FLOTATION REAGENT SELECTED FROM THE GROUP CONSISTING OF HYDROFLUORIC ACID AND A SODIUM FLUORIDEHYDROCHLORIC ACID MIX, AND REMOVING SAID PURE SILICON CRYSTALS FROM THE FLOTATION SOLUTION.
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) | 1963-10-04 | 1964-04-04 | 1964-10-04 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1967-10-04 | 1968-04-04 | 1968-10-04 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1971-10-04 | 1972-04-04 | 1972-10-04 | $7700.00 | Window Closed / Lapsed |