US3637540A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Polyurethanes from fatty acids and their production
Assignee: Hc Anderson
•
Filing: 1968-10-07
•
Granted: 1972-01-25
•
Expires: 1988-10-07
Abstract
Abstract A NEW GROUP OF POLYURETHANES ARE DESCRIBED AND CLAIMED TOGETHER WITH METHODS FOR THEIR PRODUCTION, THE SAID POLYURETHANES RESULTING FROM THE REACTION BETWEEN A POLYISOCYANATE AND A POLYOL COMPONENT, A SUBSTANTIAL PART OF WHICH IS A REACTION MIXTURE OF HYDROCARBON FATTY ACID OR A LOWER ALKYL ESTER THEREOF WITH DIALKANOLAMINE, IN WHICH AT LEAST ABOUT HALF OF THE FATTY ACID HAS BEEN CONVERTED INTO ALKANOLAMIDE, AND THE POLYOL COMPONENT CONTAINS AT LEAST ABOUT 25% OF MONOMERIC FATTY ACID RADICALS.
Inventors
- 👤 Per Wolff
- 👤 Hans-Ole Larsen
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 18:30
CPC Classifications
C; C23; C23C; C23C30/00; C23C30/005; C08; C08G; C08G18/00; C08G18/06; C08G18/28; C08G18/30; C08G18/36; C08G18/38; C08G18/3819; C08G18/3823; C08G18/3825; C08G2110/00; C08G2110/0025; C08G2110/0041; C08G2110/005; C08G2110/0058
Claims Analysis
Total Claims: 0
No claims parsed yet. Click Sync Now above to re-index claims from Google Patents.
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) | 1975-01-24 | 1975-07-26 | 1976-01-25 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-01-24 | 1979-07-26 | 1980-01-25 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-01-24 | 1983-07-26 | 1984-01-25 | $7700.00 | Window Closed / Lapsed |