US3179627A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Preparation of polyurethanes utilizing a cocatalyst system of a tertiary amine and alead salt of a thio acid of phosphorus
Assignee: Imperial Chemical Industries Ltd
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Filing: 1962-09-12
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Granted: 1965-04-20
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Expires: 1982-09-12
Abstract
No abstract record available.
Inventors
- 👤 Twitchett Harry James
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 13:57
CPC Classifications
C; C08; C08G; C08G18/00; C08G18/06; C08G18/08; C08G18/16; C08G18/161; C08G18/163; C08G18/22; C08G18/26
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
60 words
PROCESS FOR THE MANUFACTURE OF POLYURETHANE MATERIALS BY THE INTERACTION OF ORGANIC POLYISOCYANATES WITH HYDROXYL GROUP-CONTAINING POLYMERS CONTAINING AT LEAST TWO ISOCYANATE REACTIVE GROUPS PER MOLECULE IN THE PRESENCE OF A CATALYST COMBINATION COMPRISING A TERTIARY AMINE AND A LEAD SALT OF A THIO ACID OF PHOSPHORUS SELECTED FROM THE GROUP CONSISTING OF THIO ACIDS OF PHOSPHORUS OF THE FORMULAE:
Claim 2
Dependent Claim
60 words
PROCESS FOR THE MANUFACTURE OF POLYURETHANE MATERIALS BY THE INTERACTION OF ORGANIC POLYISOCYANATES WITH HYDROXYL GROUP-CONTAINING POLYMERS CONTAINING AT LEAST TWO ISOCYANATE REACTIVE GROUPS PER MOLECULE IN THE PRESENCE OF A CATALYST COMBINATION COMPRISING A TERTIARY AMINE AND A LEAD SALT OF A THIO ACID OF PHOSPHORUS SELECTED FROM THE GROUP CONSISTING OF THIO ACIDS OF PHOSPHORUS OF THE FORMULAE:
References Cited (Backward Citations)
US2906731A
Cited
US2939851A
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US3054756A
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US2984645A
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US2976260A
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US3041311A
Cited
US3109825A
Cited
US3050477A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1968-04-19 | 1968-10-19 | 1969-04-20 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1972-04-19 | 1972-10-19 | 1973-04-20 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1976-04-19 | 1976-10-19 | 1977-04-20 | $7700.00 | Window Closed / Lapsed |