US2831831A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Copolyesters containing aromatic amino acid derivatives
Assignee: Eastman Kodak Co
•
Filing: 1954-08-04
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Granted: 1958-04-22
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Expires: 1974-08-04
Abstract
No abstract record available.
Inventors
- 👤 John R Caldwell
- 👤 Gilkey Russell
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 15:46
CPC Classifications
C; C08; C08G; C08G63/00; C08G63/68; C08G63/685
Claims Analysis
Total Claims: 1
Claim 1
Independent Claim
33 words
THE METHOD WHICH COMPRISES FORMING A RESINOUS LINEAR COPOLYESTER BY COREACTING AT 150-300* C. TO AN INHERENT VISCOSITY OF AT LEAST 0.4 A POLYMETHYLENE GLYCOL, 1,2-DI(P-CARBOXYPHENOXY)ETHANE, AND A COMPOUND OF THE GENERAL STRUCTURE
References Cited (Backward Citations)
US2647104A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1961-04-21 | 1961-10-21 | 1962-04-22 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1965-04-21 | 1965-10-21 | 1966-04-22 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1969-04-21 | 1969-10-21 | 1970-04-22 | $7700.00 | Window Closed / Lapsed |