Patent US2865891A successfully refreshed from Google Patents.
US2865891A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Linear copolyesters and process
Assignee: EIDP Inc
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Filing: 1953-09-24
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Granted: 1958-12-23
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Expires: 1973-09-24
Abstract
No abstract record available.
Inventors
- 👤 Michel Rudolph Henry
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 15:18
CPC Classifications
C; C08; C08G; C08G63/00; C08G63/66; C08G63/668; C08G63/672
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
65 words
THE PROCESS WHICH COMPRISES REACTING UNDER ESTER INTERCHANGE CONDITIONS ETHYLENE GLYCOL, AN ALKYL ESTER OF TERPHTHALIC ACID WHEREIN THE ALKYL GROUP CONTAINS FROM 1-7 CARBON ATOMS, AN ALKYL ESTER OF ISOPHTHALIC ACID WHEREIN THE ALKYL GROUP CONTAINS FROM 1-7 CARBON ATOMS, AND A POLYETHYLENE GLYCOL HAVING AN AVERAGE MOLECULAR WEIGHT WITHIN THE RANGE OF FROM ABOUT 1000 TO ABOUT 4000 AND DEFINED BY THE FORMULA
Claim 2
Dependent Claim
65 words
THE PROCESS WHICH COMPRISES REACTING UNDER ESTER INTERCHANGE CONDITIONS ETHYLENE GLYCOL, AN ALKYL ESTER OF TERPHTHALIC ACID WHEREIN THE ALKYL GROUP CONTAINS FROM 1-7 CARBON ATOMS, AN ALKYL ESTER OF ISOPHTHALIC ACID WHEREIN THE ALKYL GROUP CONTAINS FROM 1-7 CARBON ATOMS, AND A POLYETHYLENE GLYCOL HAVING AN AVERAGE MOLECULAR WEIGHT WITHIN THE RANGE OF FROM ABOUT 1000 TO ABOUT 4000 AND DEFINED BY 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) | 1961-12-22 | 1962-06-23 | 1962-12-23 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1965-12-22 | 1966-06-23 | 1966-12-23 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1969-12-22 | 1970-06-23 | 1970-12-23 | $7700.00 | Window Closed / Lapsed |