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US3775375A
Expired / Lapsed
US
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Thermoplastic copolyetheresters based on 2,6-naphthalene-dicarboxylic acid
Assignee: Individual
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Filing: 1972-06-20
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Granted: 1973-11-27
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Expires: 1992-06-20
Abstract
Abstract A SEGMENTED THERMOPLASTIC COPOLYETHERESTER CONTAINING RECURRING POLYMERIC LONG CHAIN ESTER UNITS DERIVED PREDOMINANTLY FROM 2,6-NAPHTHALENEDICARBOXYLIC ACID AND LONG CHAIN GLYCOLS AND SHORT CHAIN ESTER UNITS DERIVED PREDOMINANTLY FROM 2,6-NAPHTHALENEDICARBOXYLIC ACID AND LOW MOLECULAR WEIGHT DIOLS. ABOUT 66-95% BY WEIGHT OF THE COPOLYETHERESTER CONSISTS OF SHORT CHAIN ESTER UNITS.
Inventors
- 👤 J Wolfe
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 22:47
CPC Classifications
C; C08; C08G; C08G63/00; C08G63/66; C08G63/668; C08G63/672; C08G63/02; C08G63/12; C08G63/16; C08G63/18; C08G63/181; C08G63/185; C08G63/187; C08G63/189
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) | 1976-11-26 | 1977-05-28 | 1977-11-27 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-11-26 | 1981-05-28 | 1981-11-27 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-11-26 | 1985-05-28 | 1985-11-27 | $7700.00 | Window Closed / Lapsed |