US2641589A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Composition of fluid methyl polysiloxanes
Assignee: Rhone Poulenc SA
•
Filing: 1949-11-28
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Granted: 1953-06-09
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Expires: 1969-11-28
Abstract
No abstract record available.
Inventors
- 👤 Chevalier Pierre Jean
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 22:00
CPC Classifications
C; C08; C08G; C08G77/00; C08G77/04; C08G77/06
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
123 words
A PROCESS FOR THE PRODUCTION OF A COMPOSITION OF FLUID METHYL POLYSILOXANES WHICH COMPRISES HYDROLYSING AT ROOM TEMPERATURE IN SOLUTION IN DIETHYL ETHER METHYL HALOGENO-SILANES HAVING A CH3:SI RATIO OF BETWEEN 1.15 AND 1.35 USING LIQUID WATER AS THE SOLE HYDROLYSING AGENT, SUBJECTING THE METHYL POLYSILOXANE RESIN THUS OBTAINED TO DISTILLATION UNDER REDUCED PRESSURE AND RECOVERING AS A DISTILLATE THE COMPOSITION OF FLUID METHYL POLYSILOXANES AS THE FRACTION OF A LOW DEGREE OF CONDENSATION WHICH HAS A CH3;SI RATION OF BETWEEN 1.15 AND 1.35 WHICH CONTAINS ONLY 8 TO 20 SILICON ATOMS IN THE POLYSILOXANE MOLECULE WHICH BOILS BETWEEN 120 AND 250* C. AT A PRESSURE OF 8 MM. OF MERCURY, AND WHICH GELS UNDER THE ACTION OF LEAD NAPHTHENATE AT ROOM TEMPERATURE.
Claim 2
Dependent Claim
123 words
A PROCESS FOR THE PRODUCTION OF A COMPOSITION OF FLUID METHYL POLYSILOXANES WHICH COMPRISES HYDROLYSING AT ROOM TEMPERATURE IN SOLUTION IN DIETHYL ETHER METHYL HALOGENO-SILANES HAVING A CH3:SI RATIO OF BETWEEN 1.15 AND 1.35 USING LIQUID WATER AS THE SOLE HYDROLYSING AGENT, SUBJECTING THE METHYL POLYSILOXANE RESIN THUS OBTAINED TO DISTILLATION UNDER REDUCED PRESSURE AND RECOVERING AS A DISTILLATE THE COMPOSITION OF FLUID METHYL POLYSILOXANES AS THE FRACTION OF A LOW DEGREE OF CONDENSATION WHICH HAS A CH3;SI RATION OF BETWEEN 1.15 AND 1.35 WHICH CONTAINS ONLY 8 TO 20 SILICON ATOMS IN THE POLYSILOXANE MOLECULE WHICH BOILS BETWEEN 120 AND 250* C. AT A PRESSURE OF 8 MM. OF MERCURY, AND WHICH GELS UNDER THE ACTION OF LEAD NAPHTHENATE AT ROOM TEMPERATURE.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1956-06-08 | 1956-12-08 | 1957-06-09 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1960-06-08 | 1960-12-08 | 1961-06-09 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1964-06-08 | 1964-12-08 | 1965-06-09 | $7700.00 | Window Closed / Lapsed |