US3801616A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Process for producing siloxane-polyoxyalkylene block copolymers
Assignee: Union Carbide Corp
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Filing: 1972-03-10
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Granted: 1974-04-02
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Expires: 1992-03-10
Abstract
Abstract THIS APPLICATION RELATES TO A PROCESS FOR PRODUCING SILOXANE-POLYOXYALKYLENE BLOCK COPOLYMERS BY REACTING AN ALKOXYSILOXANE AND A HYDROXYL ENDBLOCKED POLYOXYL-ALKYLENE COPOLYMER IN THE PRESENCE OF ACID SALT CATALYST HAVING A PH WITHIN A CRITICAL RANGES. THE BLOCK COPOLYMERS PRODUCED BY THE PROCESS ARE USEFUL AS FOAM STABILIZERS IN PRODUCING POLYURETHANE FOAMS.
Inventors
- 👤 C Litteral
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 16:51
CPC Classifications
C; C08; C08J; C08J9/00; C08J9/0061; C08G; C08G77/00; C08G77/42; C08G77/46; C08L; C08L83/00; C08L83/04; C08G77/04; C08G77/14; C08G77/18; C08J2375/00; C08J2375/04; C08J2483/00
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) | 1977-04-01 | 1977-10-01 | 1978-04-02 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-04-01 | 1981-10-01 | 1982-04-02 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-04-01 | 1985-10-01 | 1986-04-02 | $7700.00 | Window Closed / Lapsed |