US3933694A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Low smoke-output polyurethane and polyisocyanurate foams
Assignee: Owens Corning
•
Filing: 1974-07-10
•
Granted: 1976-01-20
•
Expires: 1994-07-10
Abstract
Abstract Polyurethane and polyisocyanurate-urethane foams are disclosed. Organosulfur compounds are added to the foams to reduce their smoking under fire conditions.
Inventors
- 👤 Donald C. Wysocki
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 00:32
CPC Classifications
C; C08; C08J; C08J9/00; C08J9/0014; C08J9/0033; C08J2375/00; C08J2375/04; Y; Y10; Y10S; Y10S521/00; Y10S521/902; Y10S521/903
Claims Analysis
Total Claims: 5
Claim 1
Independent Claim
68 words
A low smoke output, polyurethane or polyisocyanurate-urethane foam composition formed by reacting, in an NCO/OH ratio of from 1/1 to 50/1, one or more compounds having reactive --NCO groups with one or more polyols having reactive --OH groups; the foam composition containing 0.5 to 25.0% of at least one organosulfur compound, based on the weight of foam composition wherein the organosulfur compound is a sulfide or a thiocarbonate.
Claim 2
Dependent Claim
68 words
A low smoke output, polyurethane or polyisocyanurate-urethane foam composition formed by reacting, in an NCO/OH ratio of from 1/1 to 50/1, one or more compounds having reactive --NCO groups with one or more polyols having reactive --OH groups; the foam composition containing 0.5 to 25.0% of at least one organosulfur compound, based on the weight of foam composition wherein the organosulfur compound is a sulfide or a thiocarbonate.
Claim 3
Dependent Claim
18 words
A foam composition according to claim 1 wherein the percent of organosulfur compound ranges from 5.0 to 10.0.
Claim 4
Dependent Claim
15 words
A foam composition according to claim 1 wherein the organosulfur compound is ditertiary butyl polysulfide.
Claim 5
Dependent Claim
14 words
A foam composition according to claim 1 wherein the organosulfur compound is ethylene trithiocarbonate.
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) | 1979-01-19 | 1979-07-21 | 1980-01-20 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1983-01-19 | 1983-07-21 | 1984-01-20 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1987-01-19 | 1987-07-21 | 1988-01-20 | $7700.00 | Window Closed / Lapsed |