US3373186A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Process for the continuous preparation of bis-2-hydroxyethyl phthalates
Assignee: Hoechst AG
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Filing: 1965-03-22
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Granted: 1968-03-12
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Expires: 1985-03-22
Abstract
No abstract record available.
Inventors
- 👤 Bachmann Ditmar
- 👤 Grafen Karlheinz
- 👤 Fischer Wolfgang
- 👤 Schubring Armin
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 00:02
CPC Classifications
C; C08; C08G; C08G63/00; C08G63/78; C08G63/785; B; B01; B01D; B01D3/00; B01D3/14; B01D3/32; B01J; B01J14/00; B01J19/00; B01J19/18; B01J19/1862; B01J19/24; B01J19/2415; B01J19/242; C07; C07C; C07C67/00; C07C67/03; B01J2219/00; B01J2219/00049; B01J2219/00051; B01J2219/00074; B01J2219/00087; B01J2219/00094; B01J2219/00101; B01J2219/00121; B01J2219/00128; B01J2219/00186; B01J2219/18; B01J2219/182
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
125 words
IN A PROCESS FOR THE CONTINUOUS PREPARATION OF BIS-2HYDROXYETHYL ESTERS OF AROMATIC DICARBOPXYLIC ACIDS SELECTED FROM THE GROUP CONSISTING OF TEREPHTHALIC ACID AND ISOPHTALIC ACID AND THE POLYMERS OF SAID ESTERS WHICH HAVE A LOW MOLECULAR WEIGHT AND CONTAIN UP TO TEN MONOMER UNITS IN THE CHAIN BY REESTERIFICATION OF THE DIMETHYL ESTERS OF THE AFORESAID ACIDS WITH ETHYLENE GLYCOL IN THE PRESENCE OF A CATALYST IN A HEATED APPARATUS WHICH IS SUBDIVIDED INTO A PLURALITY OF PARTS IN WHICH THE DIFFERENT STAGES OF THE PROCESS TAKE PLACE, INTO WHICH ETHYLENE GLYOL AND DIMETHYL ESTERS OF THE SAID ACIDS ARE CONTINUOUSLY INTRODUCED AND FROM WHICH THE VAPOURS THAT FORM AND THE BIS-2-HYDROXYETHYL ESTERS THAT FORM ARE CONTINUOUSLY DRAWN OFF, IN WHICH PROCESS THE VAPOURS OF
Claim 2
Dependent Claim
125 words
IN A PROCESS FOR THE CONTINUOUS PREPARATION OF BIS-2HYDROXYETHYL ESTERS OF AROMATIC DICARBOPXYLIC ACIDS SELECTED FROM THE GROUP CONSISTING OF TEREPHTHALIC ACID AND ISOPHTALIC ACID AND THE POLYMERS OF SAID ESTERS WHICH HAVE A LOW MOLECULAR WEIGHT AND CONTAIN UP TO TEN MONOMER UNITS IN THE CHAIN BY REESTERIFICATION OF THE DIMETHYL ESTERS OF THE AFORESAID ACIDS WITH ETHYLENE GLYCOL IN THE PRESENCE OF A CATALYST IN A HEATED APPARATUS WHICH IS SUBDIVIDED INTO A PLURALITY OF PARTS IN WHICH THE DIFFERENT STAGES OF THE PROCESS TAKE PLACE, INTO WHICH ETHYLENE GLYOL AND DIMETHYL ESTERS OF THE SAID ACIDS ARE CONTINUOUSLY INTRODUCED AND FROM WHICH THE VAPOURS THAT FORM AND THE BIS-2-HYDROXYETHYL ESTERS THAT FORM ARE CONTINUOUSLY DRAWN OFF, IN WHICH PROCESS THE VAPOURS OF
References Cited (Backward Citations)
US3251657A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1971-03-12 | 1971-09-11 | 1972-03-12 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1975-03-12 | 1975-09-11 | 1976-03-12 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1979-03-12 | 1979-09-11 | 1980-03-12 | $7700.00 | Window Closed / Lapsed |