Patent US2843458A successfully refreshed from Google Patents.
US2843458A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Process for producing silicon tetrachloride
Assignee: Godfrey L Cabot Inc
•
Filing: 1955-10-20
•
Granted: 1958-07-15
•
Expires: 1975-10-20
Abstract
No abstract record available.
Inventors
- 👤 Robert D Beattie
- 👤 Laurent P Michel
- 👤 Charles A Stokes
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 10:24
CPC Classifications
C; C01; C01B; C01B33/00; C01B33/08
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
103 words
A PROCESS FOR PRODUCING SILICON TETRACHLORIDE FROM MIXED SOLID CHARGE MATERIALS COMPOSED 50-80% OF SILICON EARBIDE, 3-10% CARBON, 17-45% UNREDUCED SILICEOUS MATTER AND THE REMAINDER METALLIC IMPURITIES, ALL PERCENTAGES BEING BY WEIGHT, WHICH COMPRISES SUBJECTING SUCH MIXED MATERIALS IN THE FORM OF ULTIMATE PARTICLES NO LARGER THAN ABOUT 50 MESH IN SIZE AND INITIALLY PREHEATED TO A TEMPERATURE OF AT LEAST 900*C. TO A STREAM OF CHLORINE GAS AND A MINOR PROPORTION OF AN OXYGEN-CONTAINING GAS, EXOTHERMICALLY REACTING SAID SOLID MATERIALS AND GASES, THEREBY PRODUCING SILICON TETRACHLORIDE AND MAINTAINING REACTION TEMPERATURE, AND RECOVERING THE SILICON TETRACHLORIDE THUS PRODUCED FROM THE OTHER REACTION PRODUCTS.
Claim 2
Dependent Claim
103 words
A PROCESS FOR PRODUCING SILICON TETRACHLORIDE FROM MIXED SOLID CHARGE MATERIALS COMPOSED 50-80% OF SILICON EARBIDE, 3-10% CARBON, 17-45% UNREDUCED SILICEOUS MATTER AND THE REMAINDER METALLIC IMPURITIES, ALL PERCENTAGES BEING BY WEIGHT, WHICH COMPRISES SUBJECTING SUCH MIXED MATERIALS IN THE FORM OF ULTIMATE PARTICLES NO LARGER THAN ABOUT 50 MESH IN SIZE AND INITIALLY PREHEATED TO A TEMPERATURE OF AT LEAST 900*C. TO A STREAM OF CHLORINE GAS AND A MINOR PROPORTION OF AN OXYGEN-CONTAINING GAS, EXOTHERMICALLY REACTING SAID SOLID MATERIALS AND GASES, THEREBY PRODUCING SILICON TETRACHLORIDE AND MAINTAINING REACTION TEMPERATURE, AND RECOVERING THE SILICON TETRACHLORIDE THUS PRODUCED FROM THE OTHER REACTION PRODUCTS.
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) | 1961-07-14 | 1962-01-13 | 1962-07-15 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1965-07-14 | 1966-01-13 | 1966-07-15 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1969-07-14 | 1970-01-13 | 1970-07-15 | $7700.00 | Window Closed / Lapsed |