US3839387A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Process for preparing n-trimethyl-silylacetamide
Assignee: Eli Lilly and Co
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Filing: 1973-11-14
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Granted: 1974-10-01
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Expires: 1993-11-14
Abstract
Abstract 1. A PROCESS FOR PREPARING N-TRIMETHYLSILYLACETAMIDE, WHICH COMPRISES CONACTING HEXAMETHYLDISLAZANE WITH ACETAMIDE IN A RATIO OF AT LEAST ONE MOLE OF HEXAMETHYLDISILAZANE PER EACH TWO MOLES OF ACETAMIDE AT A TEMPERATURE OF FROM ABOUT 40* C. TO ABOUT 125* C. AND FOR A PERIOD DURING WHICH AMMONIA IS GENERATED FROM THE MIXTURE, AND CONTINUOUSLY REMOVING THE AMMONIA FROM THE MIXTURE DURING THE PERIOD OF ITS GENERATION.
Inventors
- 👤 T Chou
- 👤 J Burgtorf
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 13:57
CPC Classifications
C; C07; C07F; C07F7/00; C07F7/02; C07F7/08; C07F7/10
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
65 words
A PROCESS FOR PREPARING N-TRIMETHYLSILYLACETAMIDE, WHICH COMPRISES CONACTING HEXAMETHYLDISLAZANE WITH ACETAMIDE IN A RATIO OF AT LEAST ONE MOLE OF HEXAMETHYLDISILAZANE PER EACH TWO MOLES OF ACETAMIDE AT A TEMPERATURE OF FROM ABOUT 40* C. TO ABOUT 125* C. AND FOR A PERIOD DURING WHICH AMMONIA IS GENERATED FROM THE MIXTURE, AND CONTINUOUSLY REMOVING THE AMMONIA FROM THE MIXTURE DURING THE PERIOD OF ITS GENERATION.
Claim 2
Dependent Claim
65 words
A PROCESS FOR PREPARING N-TRIMETHYLSILYLACETAMIDE, WHICH COMPRISES CONACTING HEXAMETHYLDISLAZANE WITH ACETAMIDE IN A RATIO OF AT LEAST ONE MOLE OF HEXAMETHYLDISILAZANE PER EACH TWO MOLES OF ACETAMIDE AT A TEMPERATURE OF FROM ABOUT 40* C. TO ABOUT 125* C. AND FOR A PERIOD DURING WHICH AMMONIA IS GENERATED FROM THE MIXTURE, AND CONTINUOUSLY REMOVING THE AMMONIA FROM THE MIXTURE DURING THE PERIOD OF ITS GENERATION.
References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1977-09-30 | 1978-04-01 | 1978-10-01 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-09-30 | 1982-04-01 | 1982-10-01 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-09-30 | 1986-04-01 | 1986-10-01 | $7700.00 | Window Closed / Lapsed |