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Patent US4255348A successfully refreshed from Google Patents.
US4255348A
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Preparation of dimethylaminosilanes
Assignee: OSI Specialties Inc
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Filing: 1979-10-24
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Granted: 1981-03-10
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Expires: 1999-10-24
Abstract
Abstract Process for preparing dimethylaminosilanes by reacting silicon with dimethylamine.
Inventors
- 👤 William B. Herdle
- 👤 Bernard Kanner
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 14:13
CPC Classifications
C; C07; C07F; C07F7/00; C07F7/02; C07F7/08; C07F7/10; C07F7/025
Claims Analysis
Total Claims: 11
Claim 1
Independent Claim
52 words
A process for preparing dimethylaminosilane having the formula H.sub.4-a Si[N(CH.sub.3).sub.2 ].sub.a wherein a has a value of 2 to 4 inclusive, said process comprising reacting (1) copper activated silicon particles and (2) dimethylamine gas in a gas-solid reactor at a temperature in the range of about 195° C. to about 400° C.
Claim 2
Dependent Claim
52 words
A process for preparing dimethylaminosilane having the formula H.sub.4-a Si[N(CH.sub.3).sub.2 ].sub.a wherein a has a value of 2 to 4 inclusive, said process comprising reacting (1) copper activated silicon particles and (2) dimethylamine gas in a gas-solid reactor at a temperature in the range of about 195° C. to about 400° C.
Claim 3
Dependent Claim
23 words
A process as defined in claim 1, wherein the reaction is conducted at a temperature of about 230° C. to about 270° C.
Claim 4
Dependent Claim
37 words
A process as defined in claim 2, wherein the gas-solid reactor is a fluid bed reactor and whereby the dimethylamine gas is fed to the reactor at a rate sufficient to fluidize the bed of silicon particles.
Claim 5
Dependent Claim
17 words
A process as defined in claim 1, wherein at least one dimethylaminosilane is recovered after said reaction.
Claim 6
Dependent Claim
19 words
A process as defined in claim 3, wherein the reaction is conducted at a temperature of about 250° C.
Claim 7
Dependent Claim
19 words
A process as defined in claim 1, wherein the copper activated silicon is prepared in situ during said process.
Claim 8
Dependent Claim
17 words
A process as defined in claim 3, wherein at least one dimethylaminosilane is recovered after said reaction.
Claim 9
Dependent Claim
13 words
A process as defined in claim 7, wherein H Si[N(CH.sub.3).sub.2 ].sub.3 is produced.
Claim 10
Dependent Claim
13 words
A process as defined in claim 7, wherein H.sub.2 Si[N(CH.sub.3).sub.2 ].sub.2 is produced.
Claim 11
Dependent Claim
12 words
A process as defined in claim 7, wherein Si[N(CH.sub.3).sub.2 ].sub.4 is produced.
References Cited (Backward Citations)
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US2887501A
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US3467686A
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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) | 1984-03-09 | 1984-09-08 | 1985-03-10 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1988-03-09 | 1988-09-08 | 1989-03-10 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1992-03-09 | 1992-09-08 | 1993-03-10 | $7700.00 | Window Closed / Lapsed |