US2947607A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method of purifying silicon bromides contaminated with boron bromide and silicon iodides contaminated with boron iodide
Assignee: Licentia Patent Verwaltungs GmbH
•
Filing: 1958-02-26
•
Granted: 1960-08-02
•
Expires: 1978-02-26
Abstract
No abstract record available.
Inventors
- 👤 Pohl Franz Arthur
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 00:14
CPC Classifications
C; C01; C01B; C01B33/00; C01B33/08
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
106 words
A METHOD OF PRODUCING A BORON-FREE SILICON HALIDE OF THE TYPE DESCRIBED, COMPRISING THE STEPS OF ADMIXING TO A BORON CONTAINING SILICON HALIDE SELECTED FROM THE GROUP CONSISTING OF SILICON BROMIDES CONTAINING BORON BROMIDE AS AN IMPURITY AND SILICON IODIDES CONTAINING BORON IODIDE AS AN IMPURITY, AT LEAST ONE AT LEAST PARTLY CHLORINATED HYDROCARBON AS A PURIFYING AGENT HAVING A BOILING POINT LOWER THAN THAT OF THE SILICON HALIDE, REACTING THE SAME WITH THE BORON IMPURITY IN THE SILICON HALIDE TO FORM GASEOUS BORON TRICHLORIDE ESCAPING FROM THE REACTION MIXTURE AND RECOVERING THE SILICON HALIDE, PURIFIED FROM ACCOMPANYING BORON, BY FRACTIONAL DISTILLATION OF THE REACTION MIXTURE.
Claim 2
Independent Claim
106 words
A METHOD OF PRODUCING A BORON-FREE SILICON HALIDE OF THE TYPE DESCRIBED, COMPRISING THE STEPS OF ADMIXING TO A BORON CONTAINING SILICON HALIDE SELECTED FROM THE GROUP CONSISTING OF SILICON BROMIDES CONTAINING BORON BROMIDE AS AN IMPURITY AND SILICON IODIDES CONTAINING BORON IODIDE AS AN IMPURITY, AT LEAST ONE AT LEAST PARTLY CHLORINATED HYDROCARBON AS A PURIFYING AGENT HAVING A BOILING POINT LOWER THAN THAT OF THE SILICON HALIDE, REACTING THE SAME WITH THE BORON IMPURITY IN THE SILICON HALIDE TO FORM GASEOUS BORON TRICHLORIDE ESCAPING FROM THE REACTION MIXTURE AND RECOVERING THE SILICON HALIDE, PURIFIED FROM ACCOMPANYING BORON, BY FRACTIONAL DISTILLATION OF THE REACTION MIXTURE.
References Cited (Backward Citations)
US2812235A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1963-08-02 | 1964-02-01 | 1964-08-02 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1967-08-02 | 1968-02-01 | 1968-08-02 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1971-08-02 | 1972-02-01 | 1972-08-02 | $7700.00 | Window Closed / Lapsed |