US3876568A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Low smoke output polyisocyanurate-urethane foams containing sulfur
Assignee: Owens Corning
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Filing: 1973-06-18
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Granted: 1975-04-08
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Expires: 1993-06-18
Abstract
Abstract Polyisocyanurate-urethane foams are disclosed. Low smoke output is achieved by the addition of elementary sulfur.
Inventors
- 👤 Donald C Wysocki
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 19:37
CPC Classifications
C; C08; C08J; C08J9/00; C08J9/0066; C08G; C08G18/00; C08G18/06; C08G18/08; C08G18/09; C08G18/092; C08K; C08K3/00; C08K3/02; C08K3/06; C08J2379/00; C08J2379/04; Y; Y10; Y10S; Y10S521/00; Y10S521/902; Y10S521/903
Claims Analysis
Total Claims: 3
Claim 1
Independent Claim
79 words
A LOW SMOKE OUTPUT, ISOCYANURATE-URETHANE FOAM COMPOSITION FORMED BY REACTING, IN AN NCO/OH RATIO OF FROM 4/1 TO 50, ONE OR MORE COMPOUNDS HAVING REACTIVE -NCO GROUPS WITH ONE ONE OR MORE POLYOLS HAVING REACTIVE -OH GROUPS; THE ISOCYANURATE-URETHANE COMPOSITION CONTAINING, BY WEIGHT, 5 TO 15 PERCENT, BASED ON THE TOTAL WEIGHT OF THE FOAM COMPOSITION, OF ELEMENTARY SULFUR, WHEREIN THE ISOCYANURATEURETHANE COMPOSITION IS ABOUT 5 TO 25%, BY WEGHT, URETHANE AND ABOUT 75 TO 95%, BY WEIGHT, ISOCYANURATE.
Claim 2
Dependent Claim
79 words
A LOW SMOKE OUTPUT, ISOCYANURATE-URETHANE FOAM COMPOSITION FORMED BY REACTING, IN AN NCO/OH RATIO OF FROM 4/1 TO 50, ONE OR MORE COMPOUNDS HAVING REACTIVE -NCO GROUPS WITH ONE ONE OR MORE POLYOLS HAVING REACTIVE -OH GROUPS; THE ISOCYANURATE-URETHANE COMPOSITION CONTAINING, BY WEIGHT, 5 TO 15 PERCENT, BASED ON THE TOTAL WEIGHT OF THE FOAM COMPOSITION, OF ELEMENTARY SULFUR, WHEREIN THE ISOCYANURATEURETHANE COMPOSITION IS ABOUT 5 TO 25%, BY WEGHT, URETHANE AND ABOUT 75 TO 95%, BY WEIGHT, ISOCYANURATE.
Claim 3
Dependent Claim
18 words
A composition according to claim 1 wherein the percent, by weight, of elementary sulfur is 10 or 12.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1978-04-07 | 1978-10-07 | 1979-04-08 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-04-07 | 1982-10-07 | 1983-04-08 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-04-07 | 1986-10-07 | 1987-04-08 | $7700.00 | Window Closed / Lapsed |