Patent US3723364A successfully refreshed from Google Patents.
US3723364A
Expired / Lapsed
US
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Copolymer foams containing isocyanurate,carbodiimide and either amideor imide linkages
Assignee: Pharmacia and Upjohn Co
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Filing: 1971-03-01
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Granted: 1973-03-27
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Expires: 1991-03-01
Abstract
Abstract THE FRIABILITY OF POLYMER FORMS IN WHICH THE MAJOR RECURRING UNITS OR AMIDE ARE A COMBINATION OF ISOCYANURATE AND EITHER AMIDE OR AMIDE OR BOTH, IS MARKEDLY REDUCED BY INTRODUCING A MINOR PROPORATION OF CARBODIIMIDE LINKAGES INTO THE POLYMER. THIS IS ACCOMPLISHED BY INCORPORATING A CARBODIIMIDE-FORMING CATALYST (E.G. A PHOSPHOLENE OXIDE) INTO THE POLYMER FOAM FORMING REACTION MIXTURES EMPLOYED TO PREPARE THE ABOVE TYPE OF FOAM. THE RESULTING FOAMS ARE HIGHLY USEFUL, HEAT RESISTANT, THERMALLY INSULATING MATERIALS.
Inventors
- 👤 J Rose
- 👤 Laughlin A Mc
- 👤 H Nadeau
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 08:58
CPC Classifications
C; C08; C08G; C08G18/00; C08G18/06; C08G18/28; C08G18/30; C08G18/34; C08G18/08; C08G18/09; C08G18/095; C08G2110/00; C08G2110/0041; C08G2110/005; C08G2110/0058; Y; Y10; Y10S; Y10S521/00; Y10S521/901; Y10S521/902
Claims Analysis
Total Claims: 0
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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) | 1976-03-26 | 1976-09-25 | 1977-03-27 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-03-26 | 1980-09-25 | 1981-03-27 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-03-26 | 1984-09-25 | 1985-03-27 | $7700.00 | Window Closed / Lapsed |