US3220976A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Process for the preparation of copolyesters comprising reacting a bishaloformate of a dihydroxy compound with a difunctional carboxylic acid in a solution containing tertiary amine
Assignee: General Electric Co
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Filing: 1961-06-15
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Granted: 1965-11-30
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Expires: 1981-06-15
Abstract
No abstract record available.
Inventors
- 👤 Eugene P Goldberg
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 15:20
CPC Classifications
C; C08; C08G; C08G63/00; C08G63/64
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
56 words
A PROCESS FOR PREPARING A POLYESTER CONTAINING CARBOXYLATE GROUPS WHICH COMPRISES REACTING A BISHALOFORMATE OF A DIHYDROXY COMPOUND SELECTED FROM THE CLASS CONSISTING OF A DIHYDRIC PHENOL AND A GLYCOL WITH A DIFUNCTIONAL CARBOXYLIC ACID IN A SUBSTANTIALLY NON-AQUEOUS SOLUTION COMPRISING IN EXCESS OF TWO MOLES OF A TERTIARY AMINE FOR EACH MOLE OF SAID BISHALOFORMATE.
Claim 2
Dependent Claim
56 words
A PROCESS FOR PREPARING A POLYESTER CONTAINING CARBOXYLATE GROUPS WHICH COMPRISES REACTING A BISHALOFORMATE OF A DIHYDROXY COMPOUND SELECTED FROM THE CLASS CONSISTING OF A DIHYDRIC PHENOL AND A GLYCOL WITH A DIFUNCTIONAL CARBOXYLIC ACID IN A SUBSTANTIALLY NON-AQUEOUS SOLUTION COMPRISING IN EXCESS OF TWO MOLES OF A TERTIARY AMINE FOR EACH MOLE OF SAID BISHALOFORMATE.
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) | 1968-11-29 | 1969-05-31 | 1969-11-30 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1972-11-29 | 1973-05-31 | 1973-11-30 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1976-11-29 | 1977-05-31 | 1977-11-30 | $7700.00 | Window Closed / Lapsed |