Patent US2188726A successfully refreshed from Google Patents.
Patent US2901325A successfully refreshed from Google Patents.
US2901325A
Expired / Lapsed
US
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Method of preparing silicon
Assignee: AT&T Inc
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Filing: 1955-07-22
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Granted: 1959-08-25
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Expires: 1975-07-22
Abstract
No abstract record available.
Inventors
- 👤 Henry C Theuerer
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 19:51
CPC Classifications
C; C30; C30B; C30B29/00; C30B29/02; C30B29/06; C01; C01B; C01B33/00; C01B33/02; C01B33/037; C30B11/00; C30B13/00
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
87 words
THE METHOD OF REFINING SILICON WHICH COMPRISES ESTABLISHING A MOLTEN ZONE IN A MOUNTED SILICON BODY, THE SIZE OF SAID ZONE BEING SUCH THAT SURFACE TENSION FORCES IN THE ZONE KEEP THE SILICON BODY INTEGRAL, AND ADVANCING SAID MOLTEN ZONE THROUGH SAID SILICON BODY WHILE PRODUCING A FLOW OF A NEUTRAL ATMOSPHERE COMPRISING WATER VAPOR HAVING A PARTICAL PRESSURE OF FROM ABOUT 0.94 MILLIMETER OF MERCURY TO ABOUT 25 MILLIMETERS OF MERCURY OVER THE SURFACE OF THE SAID MOLTEN ZONE SO AS TO PRODUCE INTIMATE CONTACT THEREWITH.
Claim 2
Independent Claim
87 words
THE METHOD OF REFINING SILICON WHICH COMPRISES ESTABLISHING A MOLTEN ZONE IN A MOUNTED SILICON BODY, THE SIZE OF SAID ZONE BEING SUCH THAT SURFACE TENSION FORCES IN THE ZONE KEEP THE SILICON BODY INTEGRAL, AND ADVANCING SAID MOLTEN ZONE THROUGH SAID SILICON BODY WHILE PRODUCING A FLOW OF A NEUTRAL ATMOSPHERE COMPRISING WATER VAPOR HAVING A PARTICAL PRESSURE OF FROM ABOUT 0.94 MILLIMETER OF MERCURY TO ABOUT 25 MILLIMETERS OF MERCURY OVER THE SURFACE OF THE SAID MOLTEN ZONE SO AS TO PRODUCE INTIMATE CONTACT THEREWITH.
Claim 3
Independent Claim
38 words
THE METHOD OF REFINING SILICON WHICH COMPRISES BUBBLING A GAS THROUGH A MASS OF MOLTEN SILICON, SAID GAS COMPRISING WATER VAPOR HAVING A PARTIAL PRESSURE OF FROM ABOUT 0.94 MILLIMETER OF MERCURY TO ABOUT 25 MILLIMETERS OF MERCURY.
Claim 4
Independent Claim
38 words
THE METHOD OF REFINING SILICON WHICH COMPRISES BUBBLING A GAS THROUGH A MASS OF MOLTEN SILICON, SAID GAS COMPRISING WATER VAPOR HAVING A PARTIAL PRESSURE OF FROM ABOUT 0.94 MILLIMETER OF MERCURY TO ABOUT 25 MILLIMETERS OF MERCURY.
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) | 1962-08-24 | 1963-02-23 | 1963-08-25 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1966-08-24 | 1967-02-23 | 1967-08-25 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1970-08-24 | 1971-02-23 | 1971-08-25 | $7700.00 | Window Closed / Lapsed |