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Patent US3717665A successfully refreshed from Google Patents.
US3717665A
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US
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Siloxane-oxyalkylene copolymers containing si-si bonds
Assignee: Imperial Chemical Industries Ltd
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Filing: 1970-12-16
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Granted: 1973-02-20
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Expires: 1990-12-16
Abstract
Abstract SILOXANE-OXYALKYLENE COPOLYMERS HAVING AT LEAST ONE POLYSILOXANE BLOCK IN WHICH AT LEAST TWO SILICON ATOMS ARE DIRECTLY ATTACHED TO EACH OTHER AND AT LEAST ONE POLYOXYALKYLENE BLOCK IN WHICH THERE ARE AT LEAST TWO OXYALKYLENE UNITS. THE NOVEL COMPOUNDS ARE USEFUL AS SURFACTANTS IN THE PREPARATION OF POLYURETHANE FOAMS.
Inventors
- 👤 R Stuart
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 10:11
CPC Classifications
C; C08; C08J; C08J9/00; C08J9/0061; C08G; C08G77/00; C08G77/42; C08G77/46; C08J2375/00; C08J2375/04; C08J2483/00
Claims Analysis
Total Claims: 0
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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) | 1976-02-20 | 1976-08-21 | 1977-02-20 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-02-20 | 1980-08-21 | 1981-02-20 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-02-20 | 1984-08-21 | 1985-02-20 | $7700.00 | Window Closed / Lapsed |