US3819673A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Process for the polycondensation of organosilicon compounds in the presence of tin catalyst
Assignee: Rhone Poulenc SA
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Filing: 1972-03-23
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Granted: 1974-06-25
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Expires: 1992-03-23
Abstract
Abstract ORGANOSILICON COMPOUNDS CONTAINING A SI-OH GROUP ARE POLYCONDENSED USING CYCLIC ORGANOTHIO-TINS OF HIGH CATALYTIC ACTIVITY OF FORMULA (R''-)2-SN<(-S-(CH2)N-COO-R-OOC-(CH2)N-S-SN(-R'')2-S-(CH2)N- COO-R-OOC-(CH2)N-S-) IN WHICH THE SYMBOLS R, INDEPENDENTLY REPRESENT A DIVALENT HYDROCARBON RADICAL OR A DIVALENT RADICAL CONSISTING OF DIVALENT HYDROCARBON RADICALS BONDED BY -O-, -CO-, -COO- OR -CHOH- RADICALS, THE SYMBOLS R'', INDEPENDENTLY REPRESENT MONOVALENT HYDROCARBON RADICALS AND N REPRESENTS A POSITIVE INTEGER.
Inventors
- 👤 F Sagi
- 👤 M Roussos
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 06:38
CPC Classifications
C; C08; C08G; C08G77/00; C08G77/04; C08G77/06; C08G77/08
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
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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) | 1977-06-24 | 1977-12-24 | 1978-06-25 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-06-24 | 1981-12-24 | 1982-06-25 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-06-24 | 1985-12-24 | 1986-06-25 | $7700.00 | Window Closed / Lapsed |