US2866701A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method of purifying silicon and ferrosilicon
Assignee: Vanadium Corp of America
•
Filing: 1956-05-10
•
Granted: 1958-12-30
•
Expires: 1976-05-10
Abstract
No abstract record available.
Inventors
- 👤 Strauss Jerome
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 16:00
CPC Classifications
C; C01; C01B; C01B33/00; C01B33/02; C01B33/037
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
58 words
THE METHOD OF REMOVING ALUMINUM AND CALCIUM FROM SILICON-RICH MATERIAL OF THE GROUP CONSISTING OF SILICON AND FERROSILICON CONTAINING FROM ABOUT 40% UP TO ABOUT 98% SILICON, WHICH COMPRISES TREATING A MOLTEN BODY OF SAID MATERIAL WITH AN OXIDIZING AGENT, AT LEAST 50% OF THE OXYGEN CONTENT OF SAID OXIDIZING AGENT BEING IN THE FORM OF CARBON DIOXIDE.
Claim 2
Independent Claim
58 words
THE METHOD OF REMOVING ALUMINUM AND CALCIUM FROM SILICON-RICH MATERIAL OF THE GROUP CONSISTING OF SILICON AND FERROSILICON CONTAINING FROM ABOUT 40% UP TO ABOUT 98% SILICON, WHICH COMPRISES TREATING A MOLTEN BODY OF SAID MATERIAL WITH AN OXIDIZING AGENT, AT LEAST 50% OF THE OXYGEN CONTENT OF SAID OXIDIZING AGENT BEING IN THE FORM OF CARBON DIOXIDE.
References Cited (Backward Citations)
FR1088325A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1961-12-29 | 1962-06-30 | 1962-12-30 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1965-12-29 | 1966-06-30 | 1966-12-30 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1969-12-29 | 1970-06-30 | 1970-12-30 | $7700.00 | Window Closed / Lapsed |