US3580868A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Polyisocyanurate resin and foam formation catalyzed by mannich bases
Assignee: Bayer AG
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Filing: 1968-12-27
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Granted: 1971-05-25
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Expires: 1988-12-27
Abstract
Abstract SYNTHETIC RESINS ESPECIALLY FOAMS ARE PREPARED BY POLYMERISATION OF COMPOUNDS WHICH CONTAIN MORE THAN ONE ISOCYANATE GROUP IN THE MOLECULE, IN THE PRESENCE OF MANNICH BASE CATALYST WHICH ARE OBTAINED BY REACTION BETWEEN DIMETHYLAMINE, FORMALDEHYDE AND PHENOLS WHICH CONTAIN IN THE MOLECULE AT LEAST ONE ORGAINC SUBSTITUENT WHICH HAS AT LEAST 6 CARBON ATOMS, OPTIONALLY, IN THE PRESENCE OF LESS THAN EQUIVALENT QUANTITIES OF COMPOUNDS WHICH CONTAIN ACTIVE HYDROGEN ATOMS AND THE USUAL AUXILIARY AGENTS.
Inventors
- 👤 Hans Joachim Diehr
- 👤 Rudolf Merten
- 👤 Helmut Piechota
- 👤 Konrad Uhlig
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 06:29
CPC Classifications
C; C08; C08G; C08G18/00; C08G18/06; C08G18/08; C08G18/16; C08G18/18; C08G18/1825; C08G18/02; C08G18/1816; C08G2115/00; C08G2115/02; Y; Y10; Y10S; Y10S521/00; Y10S521/901; Y10S521/902
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) | 1974-05-24 | 1974-11-23 | 1975-05-25 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-05-24 | 1978-11-23 | 1979-05-25 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-05-24 | 1982-11-23 | 1983-05-25 | $7700.00 | Window Closed / Lapsed |