Patent US3684748A successfully refreshed from Google Patents.
US3684748A
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Flame-retardant polyurethane compositions comprising a phosphorus-containing polyol and an aromatic carboxylic acid anhydride
Assignee: Gulf Research and Development Co
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Filing: 1970-05-19
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Granted: 1972-08-15
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Expires: 1990-05-19
Abstract
Abstract FLAME-RETARDED POLYURETHANE MATERIALS AND FOAMS CONTAINING A FLAME-RETARDING AMOUNT OF A SYNERGISTIC COMBINATION OF A PHOSPHORUS-CONTAINING POLYOL HAVING FROM TWO TO ABOUT EIGHT HYDROXYL GROUPS AND A CARBOXYLIC ACID ANHYDRIDE HAVING AT LEAST TWO GROUPS INCLUDING THE ANHYDRO GROUP WHICH ARE REACTIVE WITH AN ISOCYANATE GROUP.
Inventors
- 👤 Walter P Barie Jr
- 👤 Norman W Franke
- 👤 Gary M Singerman
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-07 13:57
CPC Classifications
C; C08; C08G; C08G18/00; C08G18/06; C08G18/28; C08G18/30; C08G18/38; C08G18/3878; C08G18/34; C08G18/40; C08G18/48; C08G18/50; C08G18/5075; Y; Y10; Y10S; Y10S260/00; Y10S260/24
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) | 1975-08-15 | 1976-02-14 | 1976-08-15 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-08-15 | 1980-02-14 | 1980-08-15 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-08-15 | 1984-02-14 | 1984-08-15 | $7700.00 | Window Closed / Lapsed |