Patent US3020129A successfully refreshed from Google Patents.
US3020129A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Production of silicon of improved purity
Assignee: General Electric Co
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Filing: 1958-07-25
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Granted: 1962-02-06
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Expires: 1978-07-25
Abstract
No abstract record available.
Inventors
- 👤 Carlyle S Herrick
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 07:16
CPC Classifications
C; C01; C01B; C01B33/00; C01B33/02; C01B33/08
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
42 words
IN A PROCESS OF CONVERTING LOW GRADE SILICON INTO SILICON OF IMPROVED PURITY, THE IMPROVEMENT OF PROVIDING HIGH PURITY SILICON WHICH COMPRISES, FLUIDIZING SILICON IN PARTICLE FORM WITH IODINE VAPOR TO FORM SILICON TETRAIODIDE, SAID FLUIDIZING INCLUDING FEEDING SILICON POWDER INTO A
Claim 2
Dependent Claim
42 words
IN A PROCESS OF CONVERTING LOW GRADE SILICON INTO SILICON OF IMPROVED PURITY, THE IMPROVEMENT OF PROVIDING HIGH PURITY SILICON WHICH COMPRISES, FLUIDIZING SILICON IN PARTICLE FORM WITH IODINE VAPOR TO FORM SILICON TETRAIODIDE, SAID FLUIDIZING INCLUDING FEEDING SILICON POWDER INTO A
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) | 1965-02-05 | 1965-08-07 | 1966-02-06 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1969-02-05 | 1969-08-07 | 1970-02-06 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1973-02-05 | 1973-08-07 | 1974-02-06 | $7700.00 | Window Closed / Lapsed |