US3390965A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Reactor for the manufacture of polyethylene phthalates
Assignee: Hoechst AG
•
Filing: 1965-03-05
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Granted: 1968-07-02
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Expires: 1985-03-05
Abstract
No abstract record available.
Inventors
- 👤 Bachmann Ditmar
- 👤 Hoyer Hans
- 👤 Welfers Egidius
- 👤 Fischer Wolfgang
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 14:00
CPC Classifications
C; C08; C08G; C08G63/00; C08G63/78; C08G63/785; B; B01; B01J; B01J19/00; B01J19/24; B01J19/2415; B01J19/242; B01J2219/00; B01J2219/00049; B01J2219/00051; B01J2219/00121; B01J2219/00162; B01J2219/00168; B01J2219/00182; B01J2219/18; B01J2219/182
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
174 words
IN A REACTOR FOR THE CONTINUOUS MANUFACTURE OF POLYETHYLENE PHTHALATES FROM DIMETHYL PHTHALATES AND ETHYLENE GLYCOL, WHICH REACTOR IS PROVIDED WITH SEVERAL CHAMBERS WHERE CHAMBERS ARE ARRANGED SIDE BY SIDE, EACH OF WHICH IS PROVIDED WITH WEIRS, SEPARATE HEATING MEANS, AND EACH OF WHICH CHAMBERS COMMUNICATES WITH THE ADJACENT CHAMBERS THROUGH AN ADJUSTABLE OPENING PLACED BELOW THE LEVEL OF THE OVERFLOW EDGE OF THE WEIRS, AND IN WHICH CHAMBER THE GAS SPACE ABOVE THE LIQUID LEVEL IS CONNECTED WITH A SEPARATE STAM EJECTOR DEVICE OR FOR EACH CHAMBER AN INDIVIDUALLY ADJUSTABLE AND COMMON STEAM EJECTOR DEVICE, THE IMPROVEMENT COMPRISING OF: AT LEAST TWO CHAMBERS, EACH WITH AN ADJUSTABLE DISCHARGE DEVICE HAVING SHUT-OFF MEANS, SAID DEVICES COMMINICATING EXTERIORLY OF THE REACTOR THROUGH THE LIQUID SPACE OF EACH CHAMBER FROM WHICH LIQUIDS ARE DISCHARGED AND THROUGH A DEVICE IN WHICH THE WITHDRAWN LIQUIDS FROM EACH CHAMBER ARE JOINED AND DISCHARGED FROM THE REACTOR; AND MEANS FOR REGULATING EACH OF THE ADJUSTABLE DISCHARGE DEVICES RESPONSIVE TO A PRESELECTED COMBINATION OF LIQUIDS WITHDRAWN FROM EACH OF THE CHAMBERS.
Claim 2
Dependent Claim
174 words
IN A REACTOR FOR THE CONTINUOUS MANUFACTURE OF POLYETHYLENE PHTHALATES FROM DIMETHYL PHTHALATES AND ETHYLENE GLYCOL, WHICH REACTOR IS PROVIDED WITH SEVERAL CHAMBERS WHERE CHAMBERS ARE ARRANGED SIDE BY SIDE, EACH OF WHICH IS PROVIDED WITH WEIRS, SEPARATE HEATING MEANS, AND EACH OF WHICH CHAMBERS COMMUNICATES WITH THE ADJACENT CHAMBERS THROUGH AN ADJUSTABLE OPENING PLACED BELOW THE LEVEL OF THE OVERFLOW EDGE OF THE WEIRS, AND IN WHICH CHAMBER THE GAS SPACE ABOVE THE LIQUID LEVEL IS CONNECTED WITH A SEPARATE STAM EJECTOR DEVICE OR FOR EACH CHAMBER AN INDIVIDUALLY ADJUSTABLE AND COMMON STEAM EJECTOR DEVICE, THE IMPROVEMENT COMPRISING OF: AT LEAST TWO CHAMBERS, EACH WITH AN ADJUSTABLE DISCHARGE DEVICE HAVING SHUT-OFF MEANS, SAID DEVICES COMMINICATING EXTERIORLY OF THE REACTOR THROUGH THE LIQUID SPACE OF EACH CHAMBER FROM WHICH LIQUIDS ARE DISCHARGED AND THROUGH A DEVICE IN WHICH THE WITHDRAWN LIQUIDS FROM EACH CHAMBER ARE JOINED AND DISCHARGED FROM THE REACTOR; AND MEANS FOR REGULATING EACH OF THE ADJUSTABLE DISCHARGE DEVICES RESPONSIVE TO A PRESELECTED COMBINATION OF LIQUIDS WITHDRAWN FROM EACH OF THE CHAMBERS.
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) | 1971-07-02 | 1972-01-01 | 1972-07-02 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1975-07-02 | 1976-01-01 | 1976-07-02 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1979-07-02 | 1980-01-01 | 1980-07-02 | $7700.00 | Window Closed / Lapsed |