Patent US3658756A successfully refreshed from Google Patents.
US3658756A
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US
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Thermoplastic polyurethanes prepared from caprolactone polyesters and method of preparation
Assignee: ELASTOMER AG
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Filing: 1969-06-05
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Granted: 1972-04-25
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Expires: 1989-06-05
Abstract
Abstract A METHOD FOR MAKING A THERMOPLASTIC POLYURETHANE FROM THE ESTERIFICATION PRODUCT OF A HYDROXY CAPROIC ACID, A CHAIN EXTENDER AND AN ORGANIC DIISOCYANATE.
Inventors
- 👤 Franz Gottfried Reuter
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 19:03
CPC Classifications
C; C08; C08G; C08G18/00; C08G18/06; C08G18/28; C08G18/65; C08G18/66; C08G18/6633; C08G18/6637; C08G18/664; C08G18/08; C08G63/00; C08G63/02; C08G63/06
Claims Analysis
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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) | 1975-04-25 | 1975-10-25 | 1976-04-25 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-04-25 | 1979-10-25 | 1980-04-25 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-04-25 | 1983-10-25 | 1984-04-25 | $7700.00 | Window Closed / Lapsed |