US3663468A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method of making rigid polyurethane foams
Assignee: Dow Silicones Corp
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Filing: 1969-08-08
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Granted: 1972-05-16
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Expires: 1989-08-08
Abstract
Abstract AN IMPROVED PROCESS OF MAKING RIGID POLYURETHANE FOAMS IS DISCLOSED WHICH COMPRISES INCORPORATING THEREIN NEW SILOXANE-POLYETHYLENE OXIDE COPOLYMERS. WITH THIS PROCESS IT IS POSSIBLE TO CONSISTENTLY PRODUCE UNIFORM FINECELLED FOAMS HAVING A HIGH PERCENTAGE OF CLOSED CELLS UNDER A WIDE VARIETY OF MANUFACTURING CONDITIONS.
Inventors
- 👤 Loren A Haluska
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 12:12
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) | 1975-05-16 | 1975-11-15 | 1976-05-16 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-05-16 | 1979-11-15 | 1980-05-16 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-05-16 | 1983-11-15 | 1984-05-16 | $7700.00 | Window Closed / Lapsed |