US3689440A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Polyurethane foams prepared from aromatic hydroxyl-containing polyols and polyisocyanates
Assignee: Dow Chemical Co
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Filing: 1970-10-08
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Granted: 1972-09-05
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Expires: 1990-10-08
Abstract
Abstract THE THERMAL STABILITY OF POLYURETHANE FOAMS PREPARED FROM POLYISOCYANATES AND AN AROMATIC HYDROXYL-CONTAINING POLYOL IS IMPROVED BY THE ADDITION OF AN ALDEHYDE OR A COMPOUND CAPABLE OF RELEASING FORMALDEHYDE.
Inventors
- 👤 Orville L Glaesmann
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 16:34
CPC Classifications
C; C08; C08J; C08J9/00; C08J9/04; C08J9/12; C08J9/14; C08J9/143; C08J9/147; C08G; C08G18/00; C08G18/06; C08G18/28; C08G18/30; C08G18/32; C08G18/3203; C08G18/3215; C08G18/40; C08G18/48; C08G18/487; C08G18/4879; C08G18/54; C08G18/542; C08G18/83; C08G18/84; C08G2110/00; C08G2110/0016; C08G2110/0025; C08G2110/0041; C08G2110/005; C08J2375/00
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) | 1975-09-05 | 1976-03-06 | 1976-09-05 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-09-05 | 1980-03-06 | 1980-09-05 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-09-05 | 1984-03-06 | 1984-09-05 | $7700.00 | Window Closed / Lapsed |