Patent US3288732A successfully refreshed from Google Patents.
US3288732A
Expired / Lapsed
US
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Preparation of open-cell rigid polyurethanes
Assignee: Imperial Chemical Industries Ltd
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Filing: 1963-12-16
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Granted: 1966-11-29
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Expires: 1983-12-16
Abstract
No abstract record available.
Inventors
- 👤 Chapman John Frederick
- 👤 Rosbotham Ian David
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 11:54
CPC Classifications
C; C08; C08J; C08J9/00; C08J9/04; C08J9/12; C08J9/14; C08J9/143; C08G; C08G18/00; C08G18/06; C08G18/28; C08G18/40; C08G18/4009; C08G18/48; C08G18/4804; C08G18/4812; C08G2110/00; C08G2110/0025; C08G2110/0041; C08G2110/005; C08J2375/00; C08J2375/04
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
152 words
A PROCESS FOR THE MANUFACTURE OF RIGID POLYUERTHANE FOAMS HAVING AT LEAST 90% OF OPEN CELLS AND A DENSITY UP TO 2 LBS. PER CUBIC FOOT WHICH COMPRISES REACTING TOGETHER (A) AN ORGANIC POLYISOCYANATE, (B) A MIXTURE OF HYDROXYL GROUP-CONTAINING RESINS WHICH CONTAINS FROM 30% TO 70% BY WEIGHT OF A POLYESTER RESIN HAVING AT LEAST 3 HYDROXYL GROUPS PER 1000 UNITS OF MOLECULAR WEIGHT, AND A SECOND HYDROXYL GROUP-CONTAINING RESIN SELECTED FROM GROUP CONSISTING OF LINEAR POLYETHER RESINS HAVING 2 HYROXYL GROUPS PER MOLECULE AND LIGHTLY BRANCHED POLYETHER RESINS HAVING NOT MORE THAN 3 HYDROXYL GROUPS PER 1500 UNITS OF MOLECULAR WEIGHT, WHEREIN THE POLYESTER RESIN IS INCOMPATIBLE WITH SAID POLYETHER RESIN AND (C) AT LEAST 6% BY WEIGHT OF WATER BASED ON THE POLYESTER, IN THE PRESENCE OF 20 TO 200% BY WEIGHT OF SAID POLYESTER OF A HALOGENATED HYDROCARBON HAVING A BOILING POINT NOT EXCEEDING 75*C. AT ATMOSPHERIC PRESSURE.
Claim 2
Dependent Claim
152 words
A PROCESS FOR THE MANUFACTURE OF RIGID POLYUERTHANE FOAMS HAVING AT LEAST 90% OF OPEN CELLS AND A DENSITY UP TO 2 LBS. PER CUBIC FOOT WHICH COMPRISES REACTING TOGETHER (A) AN ORGANIC POLYISOCYANATE, (B) A MIXTURE OF HYDROXYL GROUP-CONTAINING RESINS WHICH CONTAINS FROM 30% TO 70% BY WEIGHT OF A POLYESTER RESIN HAVING AT LEAST 3 HYDROXYL GROUPS PER 1000 UNITS OF MOLECULAR WEIGHT, AND A SECOND HYDROXYL GROUP-CONTAINING RESIN SELECTED FROM GROUP CONSISTING OF LINEAR POLYETHER RESINS HAVING 2 HYROXYL GROUPS PER MOLECULE AND LIGHTLY BRANCHED POLYETHER RESINS HAVING NOT MORE THAN 3 HYDROXYL GROUPS PER 1500 UNITS OF MOLECULAR WEIGHT, WHEREIN THE POLYESTER RESIN IS INCOMPATIBLE WITH SAID POLYETHER RESIN AND (C) AT LEAST 6% BY WEIGHT OF WATER BASED ON THE POLYESTER, IN THE PRESENCE OF 20 TO 200% BY WEIGHT OF SAID POLYESTER OF A HALOGENATED HYDROCARBON HAVING A BOILING POINT NOT EXCEEDING 75*C. AT ATMOSPHERIC PRESSURE.
References Cited (Backward Citations)
US3194773A
Cited
US2955056A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1969-11-28 | 1970-05-30 | 1970-11-29 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1973-11-28 | 1974-05-30 | 1974-11-29 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1977-11-28 | 1978-05-30 | 1978-11-29 | $7700.00 | Window Closed / Lapsed |