US3590072A
Expired / Lapsed
US
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Method for direct esterification of terephthalic acid with ethylene glycol
Assignee: Monsanto Co
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Filing: 1966-11-18
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Granted: 1971-06-29
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Expires: 1986-11-18
Abstract
Abstract A SLURRY TEREPHTHALIC ACID IN ETHYLENE GLCOL IS MAINTAINED BELOW 100*C. UNTIL BEING INTRODUCED INTO A REACTION ZONE MAINTAINED AT A TEMPERATURE OF 200-290*C. THE COOL SLURRY PREVENTS AGGLOMERATION OF THE TEREPHTHALIC ACID WITH CONSEQUENT PLUGGING OF THE SLURRY FEED LINES
Inventors
- 👤 Allen E Leybourne
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 11:23
CPC Classifications
B; B01; B01J; B01J19/00; B01J19/18; B01D; B01D3/00; B01D3/009; C; C07; C07C; C07C67/00; C07C67/08; B01J2219/00; B01J2219/00049; B01J2219/00051; B01J2219/00074; B01J2219/00087; B01J2219/0009; B01J2219/00094; B01J2219/00121; B01J2219/00182; B01J2219/18; B01J2219/182; Y; Y02; Y02P; Y02P20/00; Y02P20/10
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1974-06-28 | 1974-12-28 | 1975-06-29 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-06-28 | 1978-12-28 | 1979-06-29 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-06-28 | 1982-12-28 | 1983-06-29 | $7700.00 | Window Closed / Lapsed |