US3560437A
Expired / Lapsed
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Method of preparing polydiorganosiloxane polymers from cyclic polydiorganosiloxanes
Assignee: Dow Silicones Corp
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Filing: 1969-05-19
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Granted: 1971-02-02
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Expires: 1989-05-19
Abstract
Abstract CYCLIC POLYDIORGANOSILOXANES OF THE FORMULA (R2SIO)A WHERE EACH R IS AN ALKYL RADICAL OR 3, 3, 3-TRIFLUOROPROPYL RADICAL AND A IS 3 OR 4 IS MIXED WITH PERFLUOROACETIC ANHYDRIDE AT ROOM TEMPERATURE AND THEREAFTER EXPOSED TO MOISTURE TO PROVIDE POLYDIORGANOSILOXANE ENDBLOCKED WITH PERFLUOROACETOXY GROUPS.
Inventors
- 👤 John P Szendrey
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 03:13
CPC Classifications
C; C08; C08G; C08G77/00; C08G77/04; C08G77/22; C08G77/24; Y; Y10; Y10S; Y10S528/00; Y10S528/901
Claims Analysis
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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) | 1974-02-01 | 1974-08-03 | 1975-02-02 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-02-01 | 1978-08-03 | 1979-02-02 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-02-01 | 1982-08-03 | 1983-02-02 | $7700.00 | Window Closed / Lapsed |