Patent US3719639A successfully refreshed from Google Patents.
US3719639A
Expired / Lapsed
US
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Flame resistant polyurethane polymers
Assignee: Baychem Corp
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Filing: 1971-03-12
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Granted: 1973-03-06
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Expires: 1991-03-12
Abstract
Abstract FLAME-RESISTANT POLYURETHANE POLYMERS ARE PREPARED BY REACTING A POLYISOCYANATE WITH AN ORGANIC COMPOUND HAVING ACTIVE HYDROGEN ATOMS WHICH ARE REACTIVE WITH -NCO GROUPS AND A CHAIN-EXTENDING COMPOSITION COMPRISING A MIXTURE OF 2,2-BIS(BROMOMETHYL)-1,3-PROPANEDIOL WITH A COMPOUND HAVING ONE OF THE FOLLOWING FORMULAS: HO-(CH2)2-NH-CO-NH-(CH2)2-OH (I) HO-(CH2)2-NH-CO-(CH2)N-CO-NH-(CH2)2-OH (II) 1,3-BIS(HO-CH2-CH2-)-BENZIMIDAZOLIDIN-2-ONE (III) 2-(HO-CH2-CH2-),5-(HO-CH2-CH2-NH-CO-)ISOINDOLENINE- 1,3-DIONE (IV) WHEREIN N IS 0,1 OR 2.
Inventors
- 👤 T Reetz
- 👤 J Britain
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 12:26
CPC Classifications
C; C08; C08G; C08G18/00; C08G18/06; C08G18/28; C08G18/65; C08G18/08; C08G18/10; C08G18/30; C08G18/38; C08G18/3819; C08G18/3823; C08G18/3842; 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) | 1976-03-05 | 1976-09-04 | 1977-03-06 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-03-05 | 1980-09-04 | 1981-03-06 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-03-05 | 1984-09-04 | 1985-03-06 | $7700.00 | Window Closed / Lapsed |