US3754012A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Preparation of methyltin compounds
Assignee: Cosan Chemical Corp
•
Filing: 1972-01-06
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Granted: 1973-08-21
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Expires: 1992-01-06
Abstract
Abstract METHYLTIN COMPOUNDS HAVING A STRUCTURE REPRESENTED BY THE FORMULA (CH3)4-NSNXN IN WHICH X IS A HALOGEN AND N IS AN INTEGER FROM 0 TO 3 ARE PRODUCED IN HIGH YIELD BY A PROCESS IN WHICH A STANNIC HALIDE IS TRANSMETHYLATED WITH TETRAMETHYLLEAD AT A TEMPERATURE BELOW ABOUT 90*C., FOLLOWING WHICH THE REACTION PRODUCT IS HEATED TO A TEMPERATURE ABOVE ABOUT 100*C. FOR A PERIOD OF TIME SUFFICIENT TO PRODUCE THE DESIRED METHYLTIN COMPOUND BY EXHAUSTIVE TRANSMETHYLATION. THESE METHYLTIN COMPOUNDS AND THEIR DERIVATIVES (SUCH AS METHYLTIN OXIDES) ARE IMPORTANT FOR THE PREPARATION OF MANY BIOCIDES, POLYMER STABILIZERS, GLASS STRENGTHENING AGENTS AND CATALYSTS.
Inventors
- 👤 E Bulten
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 08:05
CPC Classifications
C; C07; C07F; C07F7/00; C07F7/22; C07F7/2208
Claims Analysis
Total Claims: 0
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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) | 1976-08-20 | 1977-02-19 | 1977-08-21 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-08-20 | 1981-02-19 | 1981-08-21 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-08-20 | 1985-02-19 | 1985-08-21 | $7700.00 | Window Closed / Lapsed |