Patent US3728289A successfully refreshed from Google Patents.
US3728289A
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Elastic,tear-resistant,high-density foams based on polycarbodiimide-polyisocyanates
Assignee: BASF Corp
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Filing: 1970-10-26
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Granted: 1973-04-17
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Expires: 1990-10-26
Abstract
Abstract PROCESS FOR THE MANUFACTURE OF HIGHLY-ELASTIC TEARRESISTANT POLYURETHANE FOAMS OF RELATIVELY HIGH DENSITY BY A ONE STEP PROCESS WHICH COMPRISES REACTING (1) A MIXTURE COMPRISING A LINEAR POLYHYDROXYL COMPOUND HAVING A MOLECULAR WEIGHT OF ABOUT 1,000 TO ABOUT 3,000 A CHAIN EXTENDER SUCH AS A BIFUNCTIONAL GLYCOL, A CATALYST, AND WATER WITH (2) A POLYISOCYANATE HAVING AMELTING POINT BELOW ABOUT 25*C. WHICH IS A DIISOCYANATE MODIFIED BY REACTION WITH ARBODIIMIDE OR A MIXTURE OF A DIISOCYANATE AND THE REACTION PRODUCT OF A DIISOCYANATE AND A CARBODIIMIDE.
Inventors
- 👤 F Reuter
- 👤 W Fensch
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 06:02
CPC Classifications
C; C08; C08G; C08G18/00; C08G18/06; C08G18/28; C08G18/65; C08G18/66; C08G18/6603; C08G18/6607; C08G18/70; C08G18/72; C08G18/77; C08G18/78; C08G18/7875; C08G18/7893; C08G18/79; C08G2110/00; C08G2110/0008; C08G2110/0041; C08G2110/0066; C08G2110/0083; Y; Y10; Y10S; Y10S521/00; Y10S521/901
Claims Analysis
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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) | 1976-04-16 | 1976-10-16 | 1977-04-17 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-04-16 | 1980-10-16 | 1981-04-17 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-04-16 | 1984-10-16 | 1985-04-17 | $7700.00 | Window Closed / Lapsed |