Patent CH147614A successfully refreshed from Google Patents.
US2828290A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Copolyesters of a glycol, an aromatic dibasic acid, and a short chain hydroxy acid
Assignee: Eastman Kodak Co
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Filing: 1954-09-15
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Granted: 1958-03-25
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Expires: 1974-09-15
Abstract
No abstract record available.
Inventors
- 👤 John R Caldwell
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 08:16
CPC Classifications
C; C08; C08G; C08G63/00; C08G63/02; C08G63/60
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
103 words
A COPOLYESTER OBTAINED BY SIMULTANEOUSLY CORREACTION OF A GLYCOL CONTAINING 2-12 CARBON ATOMS, AND ACIDIC MATERIAL CONSISTING OF 50-85 MOLE PERCENT OF AROMATIC DICARBOXYLIC ACID SELECTED FROM THE GROUP CONSISTING OF TEREPHTHALIC ACID, 1,2-DI(P-CARBOXYPHENYL)ETHANE, 1,2-DI(PCARBOXYPHENOXY)ETHANE, 4,4H-DIPHENIC ACID AND 4,4''-BENZOPHENONEDICARBOXYLIC ACID, AND 50-15 MOLE PERCENT OF A SHORT CHAIN HYDROXY ACID SELECTED FROM THE GROUP CONSISTING OF GLYCOLIC ACID AND HYDROXYPIVALIC ACID, SAID COPOLYESTER BEING SPINNABLE AND HAVING A MELTING POINT OF AT LEAST 200*C., AID COREACTION BEING EFFECTED AT 180300*C. TO AN INHERENT VISCOSITY OF AT LEAT 0.4 USING AN AMOUNT OF GLYCOL AT LEAST EQUIVALENT TO THE AMOUNT OF SAID ACIDIC MATERIAL.
Claim 2
Dependent Claim
103 words
A COPOLYESTER OBTAINED BY SIMULTANEOUSLY CORREACTION OF A GLYCOL CONTAINING 2-12 CARBON ATOMS, AND ACIDIC MATERIAL CONSISTING OF 50-85 MOLE PERCENT OF AROMATIC DICARBOXYLIC ACID SELECTED FROM THE GROUP CONSISTING OF TEREPHTHALIC ACID, 1,2-DI(P-CARBOXYPHENYL)ETHANE, 1,2-DI(PCARBOXYPHENOXY)ETHANE, 4,4H-DIPHENIC ACID AND 4,4''-BENZOPHENONEDICARBOXYLIC ACID, AND 50-15 MOLE PERCENT OF A SHORT CHAIN HYDROXY ACID SELECTED FROM THE GROUP CONSISTING OF GLYCOLIC ACID AND HYDROXYPIVALIC ACID, SAID COPOLYESTER BEING SPINNABLE AND HAVING A MELTING POINT OF AT LEAST 200*C., AID COREACTION BEING EFFECTED AT 180300*C. TO AN INHERENT VISCOSITY OF AT LEAT 0.4 USING AN AMOUNT OF GLYCOL AT LEAST EQUIVALENT TO THE AMOUNT OF SAID ACIDIC MATERIAL.
References Cited (Backward Citations)
US2312879A
Cited
US2683136A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1961-03-24 | 1961-09-23 | 1962-03-25 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1965-03-24 | 1965-09-23 | 1966-03-25 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1969-03-24 | 1969-09-23 | 1970-03-25 | $7700.00 | Window Closed / Lapsed |