Patent US2925404A successfully refreshed from Google Patents.
US2925404A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Co-polyesters of a dicarboxylic acid, a dihydric alcohol, and a substituted benzenesulfonamide
Assignee: Eastman Kodak Co
•
Filing: 1954-03-30
•
Granted: 1960-02-16
•
Expires: 1974-03-30
Abstract
No abstract record available.
Inventors
- 👤 John R Caldwell
- 👤 John W Wellman
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 21:09
CPC Classifications
C; C08; C08G; C08G63/00; C08G63/68; C08G63/688; C08G63/6884
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
78 words
THE METHOD WHICH COMPRISES COREACTING AT 150300*C. TO AN INHERENT VISCOSITY OF AT LEAST 0.4, A MIXTURE OF A COMPOUND SELECTED FROM THE GROUP CONSISTING OF GLYCOLS OF 2-12 CARBON ATOMS AND ORGANIC ACYL ESTERS THEREOF WHEREIN THE ACYL GROUP CONTAINS 2-4 CARBON ATOMS, A SECOND COMPOUND SELECTED FROM THE GROUP CONSISTING OF DICARBOXYLIC ORGANIC ACIDS AND ALKYL ESTERS THEREOF WHEREIN EACH ALKYL GROUP ACIDS AND ALKYL ESTERS THEREOF WHERETHIRD COMPOUND CONSISTING OF A SULFONAMIDE OF THE FORMULA
Claim 2
Independent Claim
78 words
THE METHOD WHICH COMPRISES COREACTING AT 150300*C. TO AN INHERENT VISCOSITY OF AT LEAST 0.4, A MIXTURE OF A COMPOUND SELECTED FROM THE GROUP CONSISTING OF GLYCOLS OF 2-12 CARBON ATOMS AND ORGANIC ACYL ESTERS THEREOF WHEREIN THE ACYL GROUP CONTAINS 2-4 CARBON ATOMS, A SECOND COMPOUND SELECTED FROM THE GROUP CONSISTING OF DICARBOXYLIC ORGANIC ACIDS AND ALKYL ESTERS THEREOF WHEREIN EACH ALKYL GROUP ACIDS AND ALKYL ESTERS THEREOF WHERETHIRD COMPOUND CONSISTING OF A SULFONAMIDE OF THE FORMULA
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1963-02-15 | 1963-08-17 | 1964-02-16 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1967-02-15 | 1967-08-17 | 1968-02-16 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1971-02-15 | 1971-08-17 | 1972-02-16 | $7700.00 | Window Closed / Lapsed |