Patent US3030331A successfully refreshed from Google Patents.
US3030331A
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Process for preparing copolyesters comprising reacting a carbonyl halide with a dicarboxylic acid and a dihydroxy compound in the presence of a tertiary amine
Assignee: General Electric Co
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Filing: 1957-08-22
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Granted: 1962-04-17
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Expires: 1977-08-22
Abstract
No abstract record available.
Inventors
- 👤 Eugene P Goldberg
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 17:26
CPC Classifications
C; C08; C08G; C08G63/00; C08G63/64
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
76 words
A PROCESS FOR THE PREPARATION OF BLOCK COPOLYESTERS COMPRISING THE SEQUENTIAL STEPS OF (1) PASSING A CARBONYL HALIDE INTO A SOLUTION OF A DIHYDRIC PHENOL, SAID SOLUTION COMPRISING AN ORGANIC SOLVENT CONTAINING IN EXCESS OF TWO MOAR EQUIVALENTS OF A TERTIARY AMINE FOR EACH MOLAR EQUIVALENT OF CARBONYL HALIDE, (2) ADDING A DIFUNCTIONAL CARBOXYLIC ACID TO THE SOLUTION AND (3) PASSING ADDITIONAL PHOSGENE INTO THE SOLUTION, SAID STEPS BEING CARRIED OUT AT A TEMPERATURE BELOW 75*C.
Claim 2
Dependent Claim
76 words
A PROCESS FOR THE PREPARATION OF BLOCK COPOLYESTERS COMPRISING THE SEQUENTIAL STEPS OF (1) PASSING A CARBONYL HALIDE INTO A SOLUTION OF A DIHYDRIC PHENOL, SAID SOLUTION COMPRISING AN ORGANIC SOLVENT CONTAINING IN EXCESS OF TWO MOAR EQUIVALENTS OF A TERTIARY AMINE FOR EACH MOLAR EQUIVALENT OF CARBONYL HALIDE, (2) ADDING A DIFUNCTIONAL CARBOXYLIC ACID TO THE SOLUTION AND (3) PASSING ADDITIONAL PHOSGENE INTO THE SOLUTION, SAID STEPS BEING CARRIED OUT AT A TEMPERATURE BELOW 75*C.
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) | 1965-04-16 | 1965-10-16 | 1966-04-17 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1969-04-16 | 1969-10-16 | 1970-04-17 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1973-04-16 | 1973-10-16 | 1974-04-17 | $7700.00 | Window Closed / Lapsed |