US3793240A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Polyurethane foams
Assignee: Dunlop Ltd
•
Filing: 1972-09-07
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Granted: 1974-02-19
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Expires: 1992-09-07
Abstract
Abstract FLAME-RESISTANT POLYURETHANE FOAMS ARE OBTAINED BY REACTING A POLYMERIC POLYOL WITH AN ORGANIC POLYISOCYAMATE IN A REACTION MIXTURE WHICH CONTAINS (A) AS A CATALYST AND ANIONIC SURFACTANT AND (B) AN ACIDOGENIC SUBSTANCE AS AN ANTI-GING ADDITIVE. SUITABLE CATALYSTS ARE THE SODIUM OR POTASSIUM SALT OF ALEIC ACID, AND ANTI-AGING ADDITIVE IS PREFERABLY A CHLORO- OR BROMO-DERIVATIVE OF A TRIALKYL ORTHOPHOSPHATE, OF WHICH THE FOLLOWING IS A SPECIFICATION.
Inventors
- 👤 J Smith
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 08:51
CPC Classifications
C; C08; C08G; C08G18/00; C08G18/06; C08G18/70; C08G18/72; C08G18/77; C08G18/78; C08G18/79; C08G18/08; C08G18/16; C08G18/22; C08G18/225
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) | 1977-02-18 | 1977-08-20 | 1978-02-19 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-02-18 | 1981-08-20 | 1982-02-19 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-02-18 | 1985-08-20 | 1986-02-19 | $7700.00 | Window Closed / Lapsed |