US3732187A
Expired / Lapsed
US
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Carbodiimide foams of reduced brittleness prepared from resole-derived quasi-prepolymers
Assignee: BASF SE
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Filing: 1971-12-06
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Granted: 1973-05-08
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Expires: 1991-12-06
Abstract
Abstract RIGID FOAMS CHARACTERIZED BY CARBODIIMIDE LINKAGES OF REDUCED BRITTLENESS AND IMPROVED STRENGTH AND HEAT RESISTANCE ARE PREPARED BY THE CATALYTIC CONDENSATION OF AN NCO-TERMINATED RESOLE-DERIVED QUASI-PREPOLYMER, OPTIONALLY, IN ADMIXTURE WITH OTHER ORGANIC POLYISOCYANATES.
Inventors
- 👤 M Cenker
- 👤 P Kan
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 08:57
CPC Classifications
C; C08; C08G; C08G18/00; C08G18/06; C08G18/28; C08G18/40; C08G18/54; C08G18/542; C08G18/02; C08G18/025; C08G18/08; C08G18/10; C08G18/30; C08G18/32; C08G18/3225; C08G2110/00; C08G2110/0025; C08G2110/0041; C08G2110/005; C08G2110/0058; Y; Y10; Y10S; Y10S521/00; Y10S521/901; Y10S521/902
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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) | 1976-05-07 | 1976-11-06 | 1977-05-08 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-05-07 | 1980-11-06 | 1981-05-08 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-05-07 | 1984-11-06 | 1985-05-08 | $7700.00 | Window Closed / Lapsed |