Patent CA1092927A successfully refreshed from Google Patents.
US2521390A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Manufacture of organo silicon compounds by the grignard reaction
Assignee: Individual
•
Filing: 1947-02-12
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Granted: 1950-09-05
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Expires: 1967-02-12
Abstract
No abstract record available.
Inventors
- 👤 Meadowcroft Arthur Edward
- 👤 Smith William Edwin
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 13:45
CPC Classifications
C; C08; C08G; C08G77/00; C08G77/04; C08G77/06
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
84 words
A PROCESS FOR THE PRODUCTION OF SUBSTITUTED SILOXANES WHICH COMPRISES REACTING WITH AN ALKYL GRIGNARD REAGENT A SILICIC ACID ESTER OF ETHYL ALCOHOL, SAID ESTER COMPRISING A PARTIALLY HYDROLYNED ETHYL SILCATE OBTAINED BY REACTING SILICON TETRACHLORIDE AND HYDRATED ETHYL ALCOHOL CONTAINING FROM ABOUT 4 TO 11 1/2% OF WATER BY WEIGHT, THEREBY REPLACING A PORTION OF THE ETHOXY GROUPS OF THE SILICATE BY ALKYL RADICALS FROM THE GRIGNARD REAGENT, AND SEPARATING THE MAGNESLUM COMPOUNDS PRESENT IN THE REACTION MIXTURE FROM THE REMAINING REACTION PRODUCTS.
Claim 2
Dependent Claim
84 words
A PROCESS FOR THE PRODUCTION OF SUBSTITUTED SILOXANES WHICH COMPRISES REACTING WITH AN ALKYL GRIGNARD REAGENT A SILICIC ACID ESTER OF ETHYL ALCOHOL, SAID ESTER COMPRISING A PARTIALLY HYDROLYNED ETHYL SILCATE OBTAINED BY REACTING SILICON TETRACHLORIDE AND HYDRATED ETHYL ALCOHOL CONTAINING FROM ABOUT 4 TO 11 1/2% OF WATER BY WEIGHT, THEREBY REPLACING A PORTION OF THE ETHOXY GROUPS OF THE SILICATE BY ALKYL RADICALS FROM THE GRIGNARD REAGENT, AND SEPARATING THE MAGNESLUM COMPOUNDS PRESENT IN THE REACTION MIXTURE FROM THE REMAINING REACTION PRODUCTS.
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) | 1953-09-04 | 1954-03-06 | 1954-09-05 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1957-09-04 | 1958-03-06 | 1958-09-05 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1961-09-04 | 1962-03-06 | 1962-09-05 | $7700.00 | Window Closed / Lapsed |