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Patent US3574167A successfully refreshed from Google Patents.
US3574167A
Expired / Lapsed
US
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Nitrogenous polyester-ether polyols and polyurethanes prepared therefrom
Assignee: Individual
•
Filing: 1969-05-19
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Granted: 1971-04-06
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Expires: 1989-05-19
Abstract
Abstract NOVEL POLYURETHANE COMPOSITIONS WHICH ARE DERIVED FROM NOVEL NITROGENOUS POLYESTER-ETHER POLYOLS ARE DESCRIBED. THESE POLYOLS ARE PREPARED BY COREACTING AMINOALCOHOLS, OPTIONALLY ALIPHATIC POLYALCOHOLS, CYCLIC ANHYDRIDES OF ALICYCLIC AND/OR AROMATIC POLYCARBOXYLIC ACIDS, AND EPOXIDES OR OXETANES.
Inventors
- 👤 Leslie Catron Case
- 👤 Laura Kaiser Case
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 17:42
CPC Classifications
C; C08; C08G; C08G18/00; C08G18/06; C08G18/28; C08G18/67; C08G18/68; C08G18/683; C08G18/686; C08G18/40; C08G18/42; C08G18/46; C08G18/4615
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) | 1974-04-05 | 1974-10-05 | 1975-04-06 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-04-05 | 1978-10-05 | 1979-04-06 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-04-05 | 1982-10-05 | 1983-04-06 | $7700.00 | Window Closed / Lapsed |