Patent US3769244A successfully refreshed from Google Patents.
US3769244A
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Polyurethane foam reaction catalyzed by salts of 1,8 - diaza-bicyclo(5,4,0)undecene-7
Assignee: San-Abbott Ltd
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Filing: 1967-10-09
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Granted: 1973-10-30
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Expires: 1987-10-09
Abstract
Abstract A PROCESS FOR MAKING POLYURETHANES FROM ISOCYANATES AND ORGANIC POLYOLS IN THE PRESENCE OF A URETHANE CATALYST, SAID CATALYST CONTAINING BETWEEN 2 AND 100% BY WEIGHT OF A DIAZA-BICYCLO-ALKENE OR AN ACID ADDITION SALT THEREOF.
Inventors
- 👤 S Hashimoto
- 👤 H Daigo
- 👤 I Fujino
- 👤 K Nakatani
- 👤 S Suzuki
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 12:06
CPC Classifications
C; C07; C07D; C07D487/00; C07D487/02; C07D487/04; C08; C08G; C08G18/00; C08G18/06; C08G18/08; C08G18/16; C08G18/18; C08G18/20; C08G18/2045; C08G18/2063
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) | 1976-10-29 | 1977-04-30 | 1977-10-30 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-10-29 | 1981-04-30 | 1981-10-30 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-10-29 | 1985-04-30 | 1985-10-30 | $7700.00 | Window Closed / Lapsed |