Patent US3787479A successfully refreshed from Google Patents.
US3787479A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Process for the continuous transesterification of dicarboxylic acid alkyl esters with diols
Assignee: Inventa AG fuer Forschung und Patentverwertung
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Filing: 1970-05-20
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Granted: 1974-01-22
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Expires: 1990-05-20
Abstract
Abstract TRANSESTERIFICATION OF ALKYL ESTERS OF A DICARBOXYLIC ACID AND A DIOL AIDED BY A METAL SALT CATALYST WHEREIN THE REACTION MEDIUM IS PASSED THROUGH AN ELONGATED REACTION ZONE IN PLUG-LIKE FLOW (LITTLE BACK-MIXING OF THE REACTION MEDIUM), WHEREIN SOME OF THE TRANSESTERIFICATION PRODUCT IS MAINTAINED PRESENT AT THE INLET END OF THE REACTION ZONE. THEREBY INACTIVATION OF THE CATALYST IS PREVENTED.
Inventors
- 👤 W Grehl
- 👤 W Hahn
- 👤 B Stoll
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 23:05
CPC Classifications
C; C07; C07C; C07C69/00; C07C69/76; C07C69/80; C07C69/82; C07C67/00; C07C67/03; C07C69/34
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) | 1977-01-21 | 1977-07-23 | 1978-01-22 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-01-21 | 1981-07-23 | 1982-01-22 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-01-21 | 1985-07-23 | 1986-01-22 | $7700.00 | Window Closed / Lapsed |