Patent US4797500A successfully refreshed from Google Patents.
US4797500A
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US
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Purification of organometallic compounds
Assignee: Sumitomo Chemical Co Ltd
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Filing: 1988-04-21
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Granted: 1989-01-10
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Expires: 2008-04-21
Abstract
Abstract A method for purifying an organometallic compound in which an organometallic compound of gallium, aluminum or indium is contacted with at least one metal selected from metallic sodium, metallic potassium and a sodium-potassium alloy. This method is especially efficacious when the high-purity organometallic compound is used as a semiconductor because, by the disclosed method, the silicon components are removed as impurities, which silicon material tends to lower the electrical characteristics of the semiconductor.
Inventors
- 👤 Hidekimi Kadokura
- 👤 Kenichi Sawara
- 👤 Tadaaki Yako
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 23:32
CPC Classifications
C; C07; C07F; C07F5/00; C07F5/06; C07F5/061; C07F5/062
Claims Analysis
Total Claims: 5
Claim 1
Independent Claim
84 words
A method for purifying a trialkylmetallic compound of the formula R 3 M wherein R represents an alkyl group of 1-4 carbon atoms and M represents gallium, aluminum or indium, which comprises contacting said trialkylmetallic compound with at least one metallic sodium, metallic potassium or metallic potassium alloy at a temperature and a time sufficient to remove impurities, including silicon impurities, from the trialkylmetallic compound, wherein the molar ratio of the total of sodium and potassium to the trialkylmetallic compound is 0.05 to 0.6.
Claim 2
Independent Claim
84 words
A method for purifying a trialkylmetallic compound of the formula R 3 M wherein R represents an alkyl group of 1-4 carbon atoms and M represents gallium, aluminum or indium, which comprises contacting said trialkylmetallic compound with at least one metallic sodium, metallic potassium or metallic potassium alloy at a temperature and a time sufficient to remove impurities, including silicon impurities, from the trialkylmetallic compound, wherein the molar ratio of the total of sodium and potassium to the trialkylmetallic compound is 0.05 to 0.6.
Claim 3
Dependent Claim
31 words
A method according to claim 1 in which the temperature of contact ranges from normal temperature to 120° C. and the time of contact is from 30 minutes to 3 hours.
Claim 4
Dependent Claim
32 words
A method according to claim 2 in which the contact is carried out in the presence of an inactive hydrocarbon solvent having a boiling point higher than that of the trialkylmetallic compound.
Claim 5
Dependent Claim
26 words
A method for purifying an trialkylmetallic compound as set forth in claim 1 wherein a content of sodium in a sodium-potassium alloy is 20-65 mol percent.
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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) | 1992-01-10 | 1992-07-11 | 1993-01-10 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1996-01-10 | 1996-07-11 | 1997-01-10 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2000-01-10 | 2000-07-11 | 2001-01-10 | $7700.00 | Window Closed / Lapsed |