Patent US1940579A successfully refreshed from Google Patents.
Patent US2927004A successfully refreshed from Google Patents.
US2927004A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Preparation of pure silicon or germanium from their alkyls
Assignee: Bjorksten Research Laboratories Inc
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Filing: 1955-05-31
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Granted: 1960-03-01
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Expires: 1975-05-31
Abstract
No abstract record available.
Inventors
- 👤 Peter R Girardot
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 15:52
CPC Classifications
C; C01; C01B; C01B33/00; C01B33/02; C01B33/021; C01B33/027; C22; C22B; C22B3/00; C22B3/04; C22B3/16; C22B3/1683; Y; Y02; Y02P; Y02P10/00; Y02P10/20; Y10; Y10S; Y10S420/00; Y10S420/903
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
68 words
THE PROCESS FOR PREPARING A MATERIAL SELECTED FROM THE GROUP CONSISTING OF SILICON AND GERMANIUM WHICH COMPRISES REACTING A TETRAHALIDE OF SAID MATERIAL WITH AN ALKYL OF AN ALKALI METAL THEREBY FORMING A TETRALKYL OF SAID MATERIAL, PURIFYING SAID TETRALKYL OF SAID MATERIAL BY WASHING IT WITH AN INORGANIC ACID, WATER AND CARBON DISULFIDE, FILTERING, DISTILLING AND THEN THERMALLY DECOMPOSING SAID TETRALKYL OF SAID MATERIAL TO METALLIC MATERIAL.
Claim 2
Dependent Claim
68 words
THE PROCESS FOR PREPARING A MATERIAL SELECTED FROM THE GROUP CONSISTING OF SILICON AND GERMANIUM WHICH COMPRISES REACTING A TETRAHALIDE OF SAID MATERIAL WITH AN ALKYL OF AN ALKALI METAL THEREBY FORMING A TETRALKYL OF SAID MATERIAL, PURIFYING SAID TETRALKYL OF SAID MATERIAL BY WASHING IT WITH AN INORGANIC ACID, WATER AND CARBON DISULFIDE, FILTERING, DISTILLING AND THEN THERMALLY DECOMPOSING SAID TETRALKYL OF SAID MATERIAL TO METALLIC MATERIAL.
References Cited (Backward Citations)
US2238669A
Cited
US2386452A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1963-03-01 | 1963-08-31 | 1964-03-01 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1967-03-01 | 1967-08-31 | 1968-03-01 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1971-03-01 | 1971-08-31 | 1972-03-01 | $7700.00 | Window Closed / Lapsed |