Patent US4238441A successfully refreshed from Google Patents.
US3294697A
Expired / Lapsed
US
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Stable solutions for polyurethane foams
Assignee: Dow Chemical Co
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Filing: 1964-02-05
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Granted: 1966-12-27
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Expires: 1984-02-05
Abstract
No abstract record available.
Inventors
- 👤 Fevre Wesley L Le
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 09:20
CPC Classifications
C; C08; C08G; C08G18/00; C08G18/06; C08G18/28; C08G18/30; C08G18/32; C08G18/3271; C08G18/3278; C08G18/3284
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
67 words
A POLYOL SOLUTION FOR THE PREPARATION OF A POLYURETHANE FOAM BY REACTION WITH AN ORGANIC DIISOCYANATE WHEREIN SAID POLYOL IS N-(2-HYDROXYETHYL)-N,N'',N''-TRIS(2-HYDROXYPROPYL)ETHYLENEDIAMINE AND THE SOLUTION CONTAINS A CATALYST FOR SAID REACTION AND A FOAMING AGENT, SAID POLYOL SOLUTION ALSO CONTAINING AS A STABILIZER FROM 0.5 TO 5.0 WEIGHT PERCENT OF AN ORGANIC NITRO COMPOUND SELECTED FROM THE GROUP CONSISTING OF MONO- AND DINITROSUBSTITUTED ALKYL, ARYL AND ARALKYL HYDROCARBONS.
Claim 2
Dependent Claim
67 words
A POLYOL SOLUTION FOR THE PREPARATION OF A POLYURETHANE FOAM BY REACTION WITH AN ORGANIC DIISOCYANATE WHEREIN SAID POLYOL IS N-(2-HYDROXYETHYL)-N,N'',N''-TRIS(2-HYDROXYPROPYL)ETHYLENEDIAMINE AND THE SOLUTION CONTAINS A CATALYST FOR SAID REACTION AND A FOAMING AGENT, SAID POLYOL SOLUTION ALSO CONTAINING AS A STABILIZER FROM 0.5 TO 5.0 WEIGHT PERCENT OF AN ORGANIC NITRO COMPOUND SELECTED FROM THE GROUP CONSISTING OF MONO- AND DINITROSUBSTITUTED ALKYL, ARYL AND ARALKYL HYDROCARBONS.
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) | 1969-12-26 | 1970-06-27 | 1970-12-27 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1973-12-26 | 1974-06-27 | 1974-12-27 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1977-12-26 | 1978-06-27 | 1978-12-27 | $7700.00 | Window Closed / Lapsed |