US3748289A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Carbodiimide foams of reduced friability prepared in the presence of an acrylonitrile-grafted polyol
Assignee: BASF Corp
•
Filing: 1971-10-01
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Granted: 1973-07-24
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Expires: 1991-10-01
Abstract
Abstract RIGID CELLULAR FOAMS CHARACTERIZED BY CARBODIIMIDE LINKAGES AND OF REDUCED FRIABILITY ARE PREPARED BY THE CATALYTIC CONDENSATION OF AN ORGANIC POLYISOCYANATE AND IN THE PRESENCE OF AN ACRYLONITRILE-GRAFTED POLYOL.
Inventors
- 👤 M Cenker
- 👤 P Kan
- 👤 J Patton
- 👤 E Robertson
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 03:12
CPC Classifications
C; C08; C08G; C08G18/00; C08G18/06; C08G18/28; C08G18/40; C08G18/63; C08G18/632; C08G18/02; C08G18/025; C08G18/08; C08G18/10; C08G2115/00; C08G2115/06; Y; Y10; Y10S; Y10S521/00; Y10S521/901
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1976-07-23 | 1977-01-22 | 1977-07-24 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-07-23 | 1981-01-22 | 1981-07-24 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-07-23 | 1985-01-22 | 1985-07-24 | $7700.00 | Window Closed / Lapsed |