US2931709A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Decarburizing silicon tetrachloride
Assignee: Individual
•
Filing: 1956-09-17
•
Granted: 1960-04-05
•
Expires: 1976-09-17
Abstract
No abstract record available.
Inventors
- 👤 Robert S Aries
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 16:03
CPC Classifications
C; C01; C01B; C01B33/00; C01B33/08
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
55 words
THE PROCESS FOR REMOVING TRACES OF CARBON, BORON, PHOSPHOROUS AND THEIR COMPOUNDS FROM SILICON TETRAHALIDES WHICH COMPRISES CONTACTING GASEOUS SILICON TETRAHALIDE WITH A METAL HAVING A LARGE RATIO OF SURFACE TO VOLUME AND SELECTED FROM THE GROUP CONSISTING OF ALUMINUM, SODIUM AND ZINC AT AN ELEVATED TEMPERATURE BELOW THE DECOMPOSITION TEMPERATURE OF THE SILICON TETRAHALIDE.
Claim 2
Dependent Claim
55 words
THE PROCESS FOR REMOVING TRACES OF CARBON, BORON, PHOSPHOROUS AND THEIR COMPOUNDS FROM SILICON TETRAHALIDES WHICH COMPRISES CONTACTING GASEOUS SILICON TETRAHALIDE WITH A METAL HAVING A LARGE RATIO OF SURFACE TO VOLUME AND SELECTED FROM THE GROUP CONSISTING OF ALUMINUM, SODIUM AND ZINC AT AN ELEVATED TEMPERATURE BELOW THE DECOMPOSITION TEMPERATURE OF THE SILICON TETRAHALIDE.
References Cited (Backward Citations)
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1963-04-05 | 1963-10-05 | 1964-04-05 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1967-04-05 | 1967-10-05 | 1968-04-05 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1971-04-05 | 1971-10-05 | 1972-04-05 | $7700.00 | Window Closed / Lapsed |