US3779953A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Flame-retardant polyurethanes containing 1,2,5,6-tetrabromo-3,4-dihydroxyhexane
Assignee: Lyondell Chemical Technology LP
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Filing: 1971-08-16
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Granted: 1973-12-18
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Expires: 1991-08-16
Abstract
Abstract POLYMER COMPOSITIONS NORMALLY SUSCEPTIBLE TO BURNING ARE RENDERED FLAME-RETARDANT BY THE INCORPORATION THEREIN OF 1,2,5,6-TETRABROMO-3,4-DIHYDROXYHEXANE. IN PARTICULAR, A HIGHER MELTING STEREOISOMERIC FORM OF THE LATTER COMPOUND PROVIDES ESSENTIALLY SCORCH-FREE, SELF-EXTINGUISHING POLYURETHANE FOAMS WHICH EXHIBIT A GOOD OVERALL COMBINATION OF PHYSICAL AND MECHANICAL PROPERTIES.
Inventors
- 👤 A Papa
- 👤 W Proops
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 15:18
CPC Classifications
C; C08; C08G; C08G18/00; C08G18/06; C08G18/28; C08G18/30; C08G18/38; C08G18/3802; C08G18/3804; C08G18/3806; C08G18/381; C08G18/65; C08G18/66; Y; Y10; Y10S; Y10S260/00; Y10S260/24
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1976-12-17 | 1977-06-18 | 1977-12-18 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-12-17 | 1981-06-18 | 1981-12-18 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-12-17 | 1985-06-18 | 1985-12-18 | $7700.00 | Window Closed / Lapsed |