US2556897A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Processes for preparation of methyl siloxanes
Assignee: Rhone Poulenc SA
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Filing: 1947-09-16
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Granted: 1951-06-12
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Expires: 1967-09-16
Abstract
No abstract record available.
Inventors
- 👤 Bidaud Auguste Florentin
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 08:20
CPC Classifications
C; C07; C07F; C07F7/00; C07F7/02; C07F7/08; C07F7/0834; C08; C08G; C08G77/00
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
90 words
A PROCESS FOR THE PREPARATION OF METHYLSILOXANES WHICH COMPRISES MAINTAINING A METHYL HALOSILANE, HAVING THE FORMULA (CH2)NSIX4-N WHEREIN X REPRESENTS A HALOGEN ATOM AND N IS A WHOLE NUMBER NOT GREATER THAN 3, IN REACTION WITH A QUANITY OF SUBSTANTIALLY ANHYDROUS METHYL ALCOHOL AT LEAST TWICE THE STOICHIOMETRIC QUANTITY REQUIRED TO FORM METHYL HALIDE USING ALL THE HALOGEN ATOMS IN THE SILANE, AT A TEMPERATURE OF ABOUT 40* TO 60* C. UNTIL EVOLUTION OF METHYL HALIDE IS AT LEAST SUBSTANTIALLY COMPLETED, AND THEREAFTER SEPARATING METHYL SILOXANE FROM THE REACTION MIXTURE.
Claim 2
Dependent Claim
90 words
A PROCESS FOR THE PREPARATION OF METHYLSILOXANES WHICH COMPRISES MAINTAINING A METHYL HALOSILANE, HAVING THE FORMULA (CH2)NSIX4-N WHEREIN X REPRESENTS A HALOGEN ATOM AND N IS A WHOLE NUMBER NOT GREATER THAN 3, IN REACTION WITH A QUANITY OF SUBSTANTIALLY ANHYDROUS METHYL ALCOHOL AT LEAST TWICE THE STOICHIOMETRIC QUANTITY REQUIRED TO FORM METHYL HALIDE USING ALL THE HALOGEN ATOMS IN THE SILANE, AT A TEMPERATURE OF ABOUT 40* TO 60* C. UNTIL EVOLUTION OF METHYL HALIDE IS AT LEAST SUBSTANTIALLY COMPLETED, AND THEREAFTER SEPARATING METHYL SILOXANE FROM THE REACTION MIXTURE.
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) | 1954-06-11 | 1954-12-11 | 1955-06-12 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1958-06-11 | 1958-12-11 | 1959-06-12 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1962-06-11 | 1962-12-11 | 1963-06-12 | $7700.00 | Window Closed / Lapsed |