US3684753A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Flame-resistant polyurethane compositions
Assignee: Gulf Research and Development Co
•
Filing: 1971-02-22
•
Granted: 1972-08-15
•
Expires: 1991-02-22
Abstract
Abstract Novel polyurethane foams possessing improved resistance to burning and flame propagation are prepared by employing 2,5tolylene diisocyanate or its ring-substituted chloro- or bromoderivatives as a portion of the isocyanate component used in preparing the polyurethane foams.
Inventors
- 👤 Norman W Franke
- 👤 Gary M Singerman
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 14:35
CPC Classifications
C; C08; C08G; C08G18/00; C08G18/06; C08G18/70; C08G18/72; C08G18/77; C08G18/773; C08G18/74; C08G18/76; C08G18/7614; C08G18/7621
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
29 words
A fire-retardant polyurethane foam in accordance with claim 1 in which the polyisocyanate mixture comprises from about 40 to about 92 percent 2,4-tolylene diisocyanate, 2,6-tolylene diisocyanate or mixtures thereof.
Claim 2
Dependent Claim
24 words
A fire-retardant polyurethane foam in accordance with claim 2 in which the polyisocyanate mixture comprises from about 15 to about 50 percent 2,5-tolylene diisocyanate.
Claim 3
Dependent Claim
19 words
A fire-retardant polyurethane foam in accordance with claim 1 comprising a minor quantity of a flammability retarding additive composition.
Claim 4
Dependent Claim
29 words
A fire-retardant polyurethane foam in accordance with claim 4 in which the polyisocyanate mixture comprises from about 40 to about 92 percent 2,4-tolylene diisocyanate, 2,6-tolylene diisocyanate or mixtures thereof.
References Cited (Backward Citations)
GB1158562A
Cited
US3488374A
Cited
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 |