US2821460A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method of purifying silicon tetrachloride and germanium tetrachloride
Assignee: AT&T Inc
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Filing: 1955-08-31
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Granted: 1958-01-28
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Expires: 1975-08-31
Abstract
No abstract record available.
Inventors
- 👤 James M Whelan
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 20:50
CPC Classifications
C; C01; C01B; C01B33/00; C01B33/08
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
68 words
THE METHOD OF TREATING VOLATILE COMPOUNDS OF ELEMENTS WHICH ARE MEMBERS OF THE CLASS CONSISTING OF GERMANIUM AND SILICON, SAID COMPOUNDS HAVING PHOSPHORUSCONTAINING IMPURITIES THEREIN, WHICH METHOD COMPRISES CONTACTING ALUMINUM CHLORIDE WITH SUCH COMPOUNDS WHICH BOIL BETWEEN 0*C. AND 100*C. AND WHICH ARE LESS BASIC THAN IS PHOSPHORUS PENTACHLORIDE, MAINTAINING SUCH CONTACT UNTIL THE COMPLEX ALCL3 PCL5 IS FORMED, AND THEN SEPARATING SAID VOLATILE COMPOUNDS FROM THE COMPLEX.
Claim 2
Independent Claim
68 words
THE METHOD OF TREATING VOLATILE COMPOUNDS OF ELEMENTS WHICH ARE MEMBERS OF THE CLASS CONSISTING OF GERMANIUM AND SILICON, SAID COMPOUNDS HAVING PHOSPHORUSCONTAINING IMPURITIES THEREIN, WHICH METHOD COMPRISES CONTACTING ALUMINUM CHLORIDE WITH SUCH COMPOUNDS WHICH BOIL BETWEEN 0*C. AND 100*C. AND WHICH ARE LESS BASIC THAN IS PHOSPHORUS PENTACHLORIDE, MAINTAINING SUCH CONTACT UNTIL THE COMPLEX ALCL3 PCL5 IS FORMED, AND THEN SEPARATING SAID VOLATILE COMPOUNDS FROM THE COMPLEX.
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) | 1961-01-27 | 1961-07-29 | 1962-01-28 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1965-01-27 | 1965-07-29 | 1966-01-28 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1969-01-27 | 1969-07-29 | 1970-01-28 | $7700.00 | Window Closed / Lapsed |