US2951060A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Process for preparing polyesters in the presence of manganous carboxylate catalysts
Assignee: EIDP Inc
•
Filing: 1954-03-02
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Granted: 1960-08-30
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Expires: 1974-03-02
Abstract
No abstract record available.
Inventors
- 👤 Harry R Billica
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 00:05
CPC Classifications
C; C08; C08G; C08G63/00; C08G63/78; C08G63/82; C08G63/85; C08G63/83; C08G63/84; C08G63/87
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
108 words
IN THE PROCESS FOR MANUFACTURING FILAMENT- AND FILMFORMING POLYMETHYLENE TEREPHTHALATE WHEREIN A GLYCOL OF THE FORMULA, HO(CH2)NOH, WHERE "N" IS AN INTEGER FROM 2 TO 10 INCLUSIVE, IS REACTED WITH AN ALKYL ESTER OF TEREPHTHALIC ACID HAVING FROM 1 TO 4 CARBON ATOMS IN THE ALKYL GROUP UNDER CONDITIONS TO EFFECT ESTER INTERCHANGE, AND THE RESULTING GLYCOL TEREPHTHALATE IS THEREAFTER POLYMERIZED UNDER CONDITIONS TO FORM POLYMETHYLENE TEREPHTHALATE, THE IMPROVEMENT WHICH COMPRISES CARRYING OUT THE ESTER INTERCHANGE IN THE PRESENCE OF A CATALYST FROM THE GROUP CONSISTING OF THE MANGANOUS SALTS OF ALIPHATIC MONOCARBOXYLIC ACIDS AND ALIPHATIC HYDROXY MONOCARBOXYLIC ACIDS, SAID ACIDS CONTAINING NOT MORE THAN SIX CARBON ATOMS.
Claim 2
Dependent Claim
108 words
IN THE PROCESS FOR MANUFACTURING FILAMENT- AND FILMFORMING POLYMETHYLENE TEREPHTHALATE WHEREIN A GLYCOL OF THE FORMULA, HO(CH2)NOH, WHERE "N" IS AN INTEGER FROM 2 TO 10 INCLUSIVE, IS REACTED WITH AN ALKYL ESTER OF TEREPHTHALIC ACID HAVING FROM 1 TO 4 CARBON ATOMS IN THE ALKYL GROUP UNDER CONDITIONS TO EFFECT ESTER INTERCHANGE, AND THE RESULTING GLYCOL TEREPHTHALATE IS THEREAFTER POLYMERIZED UNDER CONDITIONS TO FORM POLYMETHYLENE TEREPHTHALATE, THE IMPROVEMENT WHICH COMPRISES CARRYING OUT THE ESTER INTERCHANGE IN THE PRESENCE OF A CATALYST FROM THE GROUP CONSISTING OF THE MANGANOUS SALTS OF ALIPHATIC MONOCARBOXYLIC ACIDS AND ALIPHATIC HYDROXY MONOCARBOXYLIC ACIDS, SAID ACIDS CONTAINING NOT MORE THAN SIX CARBON ATOMS.
References Cited (Backward Citations)
US2402486A
Cited
US2578660A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1963-08-30 | 1964-02-29 | 1964-08-30 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1967-08-30 | 1968-02-29 | 1968-08-30 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1971-08-30 | 1972-02-29 | 1972-08-30 | $7700.00 | Window Closed / Lapsed |