US3629165A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Control of polyurethane foam process using polysiloxane polyether copolymer surfactant
Assignee: General Electric Co
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Filing: 1969-08-25
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Granted: 1971-12-21
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Expires: 1989-08-25
Abstract
Abstract A POLYSILOXANE POLYETHER COPOLYMER, WHEREIN THE POLYSILOXANE CHAIN IS JOINED TO THE POLYETHER CHAIN THROUGH CARBOXY ALKYL RADICALS, IS USED AS A POLYURETHANE FOAM ADDITIVE. THE CARBOXY ALKYL GROUPS ARE ATTACHED TO THE SILICON ATOMS THROUGH SI-C BONDS WHICH ENHANCES THE HYDROLYTIC STABILITY OF THE COPOLYMER. THE COPOLYMERS ARE PRODUCED BY REACTING CARBOXY ALKYL CONTAINING POLYSILOXANES WITH HYDROXY STOPPED POLYETHERS.
Inventors
- 👤 Norman G Holdstock
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-09 14:20
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) | 1974-12-20 | 1975-06-21 | 1975-12-21 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-12-20 | 1979-06-21 | 1979-12-21 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-12-20 | 1983-06-21 | 1983-12-21 | $7700.00 | Window Closed / Lapsed |