US3814707A
Expired / Lapsed
US
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Bicyclic amidine catalysts in polyurethane foam process
Assignee: Bayer AG
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Filing: 1968-03-13
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Granted: 1974-06-04
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Expires: 1988-03-13
Abstract
Abstract BICYCLIC AMIDINES ARE USED AS CATALYST TO PROMOTE THE REACTION BETWEEN HYDROXYL COMPOUNDS AND ORGANIC ISOCYANATES. THE BICYCLIC AMIDINES HAVE THE GENERAL FORMULA N<(=C(-)-(CH2)M-N(-)-(CH2)N-) WHERE C(-) AND N(-) ARE JOINED WHEREIN M IS A WHOLE NUMBER FROM 3 TO 7 AND N IS A WHOLE NUMBER FROM 2 TO 4.
Inventors
- 👤 F Moeller
- 👤 G Hauptmann
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 17:09
CPC Classifications
C; C08; C08G; C08G18/00; C08G18/06; C08G18/28; C08G18/65; C08G18/6505; C08G18/6523; C08G18/6535; C08G18/08; C08G18/088; C08G18/0885; C08G18/16; C08G18/18; C08G18/20; C08G18/2045; C08G18/2063
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) | 1977-06-03 | 1977-12-03 | 1978-06-04 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-06-03 | 1981-12-03 | 1982-06-04 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-06-03 | 1985-12-03 | 1986-06-04 | $7700.00 | Window Closed / Lapsed |