US2852543A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Process for the preparation of alkyl tin chlorides
Assignee: Ethyl Corp
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Filing: 1954-10-14
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Granted: 1958-09-16
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Expires: 1974-10-14
Abstract
No abstract record available.
Inventors
- 👤 Sidney M Blitzer
- 👤 Jr Joseph R Zietz
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 19:14
CPC Classifications
C; C07; C07F; C07F7/00; C07F7/22; C07F7/2208
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
79 words
IN THE PROCESS FOR PRODUCING ALKYL TIN HALIDES BY REACTING A SODIUM-TIN ALLOY WITH AN ALKYL HALIDE, THE IMPROVEMENT BY WHICH THE ALKYL HALIDE IS THE CHLORIDE OF AN ALKYL GROUP HAVING AT LEAST TREE AND NO MORE THAN EIGHTEEN CARBONS, AND THE REACTION IS CARRIED OUT AT A TEMPERATURE AT LEAST AS HIGH AS 140*C. BUT BELOW THE DECOMPOSITION TEMPERATURE OF THE DESIRED PRODUCT AND AT A PRESSURE SUFFICIENT TO MAINTAIN THE ALKYL CHLORIDE IN A LIQUID STATE.
Claim 2
Dependent Claim
79 words
IN THE PROCESS FOR PRODUCING ALKYL TIN HALIDES BY REACTING A SODIUM-TIN ALLOY WITH AN ALKYL HALIDE, THE IMPROVEMENT BY WHICH THE ALKYL HALIDE IS THE CHLORIDE OF AN ALKYL GROUP HAVING AT LEAST TREE AND NO MORE THAN EIGHTEEN CARBONS, AND THE REACTION IS CARRIED OUT AT A TEMPERATURE AT LEAST AS HIGH AS 140*C. BUT BELOW THE DECOMPOSITION TEMPERATURE OF THE DESIRED PRODUCT AND AT A PRESSURE SUFFICIENT TO MAINTAIN THE ALKYL CHLORIDE IN A LIQUID STATE.
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) | 1961-09-15 | 1962-03-17 | 1962-09-16 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1965-09-15 | 1966-03-17 | 1966-09-16 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1969-09-15 | 1970-03-17 | 1970-09-16 | $7700.00 | Window Closed / Lapsed |