US2899408A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Copolyesters of a glycol
Assignee: —
•
Filing: —
•
Granted: 1959-08-11
•
Expires: 1976-08-11
Abstract
No abstract record available.
Inventors
No inventors recorded.
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 15:08
CPC Classifications
C; C08; C08G; C08G63/00; C08G63/68; C08G63/685; C08G63/6854
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
66 words
THE METHOD WHICH COMPRISES COREACTING AT A TEMPERATURE OF 150-300*C. TO AN INHERENT VISCOSITY OF AT LEAST 0.4, A MIXTURE OF A FIRST COMPOUND SELECTED FROM THE GROUP CONSISTING OF DIHYDRIC ALCOHOLS AND ORGANIC ACYL ESTERS THEREOF WHEREIN THE ACYL GROUP CONTAINS 2-4 CARBON ATOMS, AN ALKYL DIESTER OF P,P''-SULFONYLDIBENZOIC ACID WHEREIN THE ALKYL GROUP CONTAINS 1-10 CARBON ATOMS AND AN ANILINE DERIVATIVE OF THE FORMULA
Claim 2
Independent Claim
66 words
THE METHOD WHICH COMPRISES COREACTING AT A TEMPERATURE OF 150-300*C. TO AN INHERENT VISCOSITY OF AT LEAST 0.4, A MIXTURE OF A FIRST COMPOUND SELECTED FROM THE GROUP CONSISTING OF DIHYDRIC ALCOHOLS AND ORGANIC ACYL ESTERS THEREOF WHEREIN THE ACYL GROUP CONTAINS 2-4 CARBON ATOMS, AN ALKYL DIESTER OF P,P''-SULFONYLDIBENZOIC ACID WHEREIN THE ALKYL GROUP CONTAINS 1-10 CARBON ATOMS AND AN ANILINE DERIVATIVE 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) | 1962-08-10 | 1963-02-09 | 1963-08-11 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1966-08-10 | 1967-02-09 | 1967-08-11 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1970-08-10 | 1971-02-09 | 1971-08-11 | $7700.00 | Window Closed / Lapsed |