US2839508A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Copolyesters of a glycol, an alkylene diamine dicarboxylate and a sulfone ester
Assignee: Eastman Kodak Co
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Filing: 1955-04-26
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Granted: 1958-06-17
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Expires: 1975-04-26
Abstract
No abstract record available.
Inventors
- 👤 Jack L R Williams
- 👤 Thomas M Laakso
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 18:07
CPC Classifications
C; C08; C08G; C08G69/00; C08G69/44
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
81 words
A HIGHLY-POLYMERIC COPOLYESTER HAVING AN INERENT VISCOSITY OF 0.4, A MELTING POINT ABOVE 200*C. AND RESULTING FROM HEATING AT 100-300*C. A MIXTURE OF BIFUNCTIONAL REACTIONS CONSISTING FUNCTIONALLY OF AT LEAST TWO MOLAR PROPORTIONS OF ALKYLENE GLYCOL, AND ONE MOLAR PROPORTION OF A MIXTURE OF 5-95 MOL PERCENT OF N,''N''BIS(P-CARBOXYLBENZOYL)ALKYLENE DIAMINE, AND 95-5 MOLE PERCENT OF BIS(P-CARBOXYPHENYL)SULFONE, EACH OF SAID ALKYLENE GROUPS CONTAINING 2-10 CARBON ATOMS, SAID HIGHLY POLYMERIC COPOLYESTER RESULTING SOLELY FROM THE CONDENSATION POLYMERIZATION OF GLYCOL DIESTER OF THE FORMULAS
Claim 2
Dependent Claim
81 words
A HIGHLY-POLYMERIC COPOLYESTER HAVING AN INERENT VISCOSITY OF 0.4, A MELTING POINT ABOVE 200*C. AND RESULTING FROM HEATING AT 100-300*C. A MIXTURE OF BIFUNCTIONAL REACTIONS CONSISTING FUNCTIONALLY OF AT LEAST TWO MOLAR PROPORTIONS OF ALKYLENE GLYCOL, AND ONE MOLAR PROPORTION OF A MIXTURE OF 5-95 MOL PERCENT OF N,''N''BIS(P-CARBOXYLBENZOYL)ALKYLENE DIAMINE, AND 95-5 MOLE PERCENT OF BIS(P-CARBOXYPHENYL)SULFONE, EACH OF SAID ALKYLENE GROUPS CONTAINING 2-10 CARBON ATOMS, SAID HIGHLY POLYMERIC COPOLYESTER RESULTING SOLELY FROM THE CONDENSATION POLYMERIZATION OF GLYCOL DIESTER OF THE FORMULAS
References Cited (Backward Citations)
US2071250A
Cited
US2614120A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1961-06-16 | 1961-12-16 | 1962-06-17 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1965-06-16 | 1965-12-16 | 1966-06-17 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1969-06-16 | 1969-12-16 | 1970-06-17 | $7700.00 | Window Closed / Lapsed |