Patent US1534732A successfully refreshed from Google Patents.
Patent US3057908A successfully refreshed from Google Patents.
US3057908A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Process for preparing high molecular linear polyesters from polymethylene glycols and esters of benzene dicarboxylic acids
Assignee: Hoechst AG
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Filing: 1958-11-12
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Granted: 1962-10-09
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Expires: 1978-11-12
Abstract
No abstract record available.
Inventors
- 👤 Gruschke Hans
- 👤 Medem Heinz
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-07 14:26
CPC Classifications
C; C08; C08G; C08G63/00; C08G63/78; C08G63/82; C08G63/83
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
139 words
THE METHOD OF MAKING DIOL ESTER OF TEREPHATHILIC ACID BY AN ESTER INTERCHANGE REACTAION, SAID ESTERS BEING ADAPTABLE TO CONDENSATION TO FORM HIGH MOLECULAR WEIGHT LINEAR POLYESTERS,WHICH PROCESS COMPRISES HEATING (1) A POLYMETHYLENE GLYCOL CONTAINING FROM 2 TO 6 CARBON ATOMS AND (2) AN ESTER OF TEREPHTHALIC ACID WITH A MONOHYDRIC ALCOHOL CONTAINING FROM 1 TO 6 CARBON ATOMS, IN THE PRESENCE OF 0.005 TO 0.05 MOL PERCENT, CALCULATED ON SAID TEREPHTHALIC ACID ESTER, OF (3) A CATALYST SELECTED FROM THE GROUP CONSISTING OF MANGANESE PHOSPHATE, MIXTURES OF A MAJOR PORTION OF MANGANESES PHOSPHATE WITH A BALANCE OF ANTIMONY TRIOXIDE, AND MIXTURES OF A MAJOR PORTION OF MANGANESE PHOSPHATE WITH A BALANCE OF ANTIMONY TRIOXIDE AND ZINC ACETATE, AT A TEMPERATURE SUFFICIENT TO DISTILL OFF MONOHYDRIC ALCOHOL FORMED BY SAID RESSTERIFICATION AND UNTIL SAID MONOHYDRIC ALCOHOL HAS DISTILLED OFF.
Claim 2
Independent Claim
139 words
THE METHOD OF MAKING DIOL ESTER OF TEREPHATHILIC ACID BY AN ESTER INTERCHANGE REACTAION, SAID ESTERS BEING ADAPTABLE TO CONDENSATION TO FORM HIGH MOLECULAR WEIGHT LINEAR POLYESTERS,WHICH PROCESS COMPRISES HEATING (1) A POLYMETHYLENE GLYCOL CONTAINING FROM 2 TO 6 CARBON ATOMS AND (2) AN ESTER OF TEREPHTHALIC ACID WITH A MONOHYDRIC ALCOHOL CONTAINING FROM 1 TO 6 CARBON ATOMS, IN THE PRESENCE OF 0.005 TO 0.05 MOL PERCENT, CALCULATED ON SAID TEREPHTHALIC ACID ESTER, OF (3) A CATALYST SELECTED FROM THE GROUP CONSISTING OF MANGANESE PHOSPHATE, MIXTURES OF A MAJOR PORTION OF MANGANESES PHOSPHATE WITH A BALANCE OF ANTIMONY TRIOXIDE, AND MIXTURES OF A MAJOR PORTION OF MANGANESE PHOSPHATE WITH A BALANCE OF ANTIMONY TRIOXIDE AND ZINC ACETATE, AT A TEMPERATURE SUFFICIENT TO DISTILL OFF MONOHYDRIC ALCOHOL FORMED BY SAID RESSTERIFICATION AND UNTIL SAID MONOHYDRIC ALCOHOL HAS DISTILLED OFF.
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) | 1965-10-08 | 1966-04-09 | 1966-10-09 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1969-10-08 | 1970-04-09 | 1970-10-09 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1973-10-08 | 1974-04-09 | 1974-10-09 | $7700.00 | Window Closed / Lapsed |