Patent US3071444A successfully refreshed from Google Patents.
US3071444A
Expired / Lapsed
US
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Preparation of purified semiconductor material
Assignee: AT&T Inc
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Filing: 1958-12-16
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Granted: 1963-01-01
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Expires: 1978-12-16
Abstract
No abstract record available.
Inventors
- 👤 Henry C Theuerer
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 22:44
CPC Classifications
C; C01; C01B; C01B33/00; C01B33/02; B; B01; B01J; B01J20/00; B01J20/02; B01J20/06; C01B33/04; C01B33/08; C01B33/107; C01G; C01G17/00; C01G17/04; C22; C22B; C22B41/00; C30; C30B; C30B13/00; C30B29/00; C30B29/10; C30B29/12
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
88 words
IN A PROCESS FOR REDUCING A LIQUID PHASE CHLORINECONTAINING COMPOUND OF SILICON SELECTED FROM THE GROUP CONSISTING OF SILICON TETRACHLORIDE AND THE CHLOROSILANES, THE STEPS COMPRISING ADDING CHLORINE TO THE SAID MATERIAL, ADDING ALUMINUM CHLORIDE TO THE SAID MATERIAL WHILE IN THE LIQUID PHASE, AND PASSING THE MATERIAL THROUGH A PACKED COLUMN HAVING A PACKING COMPRISING AT LEAST ONE ABSORBENT SELECTED FROM A GROUP CONSISTING OF HYDROUS OXIDES, HYDROUS SILICATES AND CHARCOAL, AND FINALLY REDUCING THE MATERIAL SO PROCESSED BY VAPOR PHASE HYDROGEN REDUCTION ON A SILICON BODY.
Claim 2
Dependent Claim
88 words
IN A PROCESS FOR REDUCING A LIQUID PHASE CHLORINECONTAINING COMPOUND OF SILICON SELECTED FROM THE GROUP CONSISTING OF SILICON TETRACHLORIDE AND THE CHLOROSILANES, THE STEPS COMPRISING ADDING CHLORINE TO THE SAID MATERIAL, ADDING ALUMINUM CHLORIDE TO THE SAID MATERIAL WHILE IN THE LIQUID PHASE, AND PASSING THE MATERIAL THROUGH A PACKED COLUMN HAVING A PACKING COMPRISING AT LEAST ONE ABSORBENT SELECTED FROM A GROUP CONSISTING OF HYDROUS OXIDES, HYDROUS SILICATES AND CHARCOAL, AND FINALLY REDUCING THE MATERIAL SO PROCESSED BY VAPOR PHASE HYDROGEN REDUCTION ON A SILICON BODY.
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) | 1965-12-31 | 1966-07-02 | 1967-01-01 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1969-12-31 | 1970-07-02 | 1971-01-01 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1973-12-31 | 1974-07-02 | 1975-01-01 | $7700.00 | Window Closed / Lapsed |