US3644484A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Production of bis-hydroxyalkyl esters of benzene dicarboxylic acids
Assignee: Celanese Corp
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Filing: 1968-04-02
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Granted: 1972-02-22
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Expires: 1988-04-02
Abstract
Abstract PROCESS FOR THE PRODUCTON OF BIS-HYDROXYALKYL PHTHALATES BY REACTING AN ALKYLEN OXIDE WITH A BENZENE DICARBOXYLIC ACID IN THE PRESENCE OF A CATALYST AND IN AN ALKYLSUBSTITUTED DIOXOLENE REACTION MEDIUM. FOR EXAMPLE ETHLENE OXIDE IS REACTED WITH TEREPHTHALIC ACID IN A 2ETHYL, 2-METHYL DIOXOLANE REACTION MEDIUM USING A TERTIARY AMINE CATALYST SO AS TO PRODUCE BIS(2-HYDROXYENTHYL) TEREPHTAHALATE.
Inventors
- 👤 Enrique R Witt
- 👤 Donald R Larkin
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 17:46
CPC Classifications
C; C07; C07C; C07C69/00; C07C69/76; C07C69/80; C07C67/00; C07C67/24; C07C67/26; C09; C09D; C09D7/00; C09D7/40; C09D7/47; C09D7/60; C09D7/63; C08; C08K; C08K5/00; C08K5/04; C08K5/10
Claims Analysis
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References Cited (Backward Citations)
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1975-02-21 | 1975-08-23 | 1976-02-22 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-02-21 | 1979-08-23 | 1980-02-22 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-02-21 | 1983-08-23 | 1984-02-22 | $7700.00 | Window Closed / Lapsed |