US3578612A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Polyurethane forms based on dimer fatty acid polyalkanolamides
Assignee: Bayer Pharma AG
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Filing: 1969-07-24
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Granted: 1971-05-11
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Expires: 1989-07-24
Abstract
Abstract FOAMS OF A SYNTHETIC AMIDE GROUP-CONTAINING POLYURETHANE RESIN FORMED BY REACTING AND FOAMING A POLYMERIC FATTY ACID ALKANOLAMIDE, OR A ALKOXYLATED POLYMERIC FATTY ACID ALKANOLAMIDE, WITH A POLYISOCYANATE. THE POLYMERIC FATTY ACID ALKANOLAMIDE IS MADE TYPICALLY BY CONDENSING DIMERIZED FATTY ACID WITH MONO- OR DIALKANOLAMINES. THE FOAMS HAVE EXCELLENT RESISTANCE TO HYDROLYSIS.
Inventors
- 👤 Christian Burba
- 👤 Manfred Drawert
- 👤 Eugen Griebsch
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 08:46
CPC Classifications
C; C08; C08G; C08G18/00; C08G18/06; C08G18/28; C08G18/40; C08G18/48; C08G18/50; C08G18/5021; C08G18/5036; C08G18/5039; C08G18/30; C08G18/38; C08G18/3819; C08G18/3823; C08G18/3825
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) | 1974-05-10 | 1974-11-09 | 1975-05-11 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-05-10 | 1978-11-09 | 1979-05-11 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-05-10 | 1982-11-09 | 1983-05-11 | $7700.00 | Window Closed / Lapsed |