US3174830A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Apparatus useful in the continuous polycondensation of diolesters of terephthalic acid
Assignee: Glanzstoff AG
•
Filing: 1961-02-14
•
Granted: 1965-03-23
•
Expires: 1981-02-14
Abstract
No abstract record available.
Inventors
- 👤 Watzl Anton
- 👤 Gerlach Richard
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 18:10
CPC Classifications
C; C08; C08G; C08G63/00; C08G63/78; C08G63/785; B; B01; B01J; B01J19/00; B01J19/18; B01J2219/00; B01J2219/00049; B01J2219/00051; B01J2219/00074; B01J2219/00087; B01J2219/00094; B01J2219/00159; B01J2219/00162; B01J2219/18; B01J2219/185; B01J2219/187
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
93 words
APPARATUS FOR CONTINUOUS POLYCONDENSATION REACTIONS COMPRISING AN INCLINED, CLOSED REATION TUBE SUBDIVIDED BY BAFFLES INTO COMPARTMENTS WITH A VAPOR SPACE ABOVE SAID COMPARTMENTS, A ROTATABLE AGITATOR IN SAID COMPARTMENTS, MEANS FOR HEATING SAID REACTION TUBE, A DISCHARGE PIPE IN THE LOWERMOST END OF SAID REACTION TUBE, A ROTATABLE WORM POSITIONED IN SAID PIPE, MEANS FOR FEEDING POLYCONDENSABLE CHEMICALS INTO SAID REACTION TUBE AT THE OPPOSITE END THEREOF, A PACKED FRACTIONATION TOWER COMMUNICATING WITH SAID VAPOR SPACE IN SAID REACTION TUBE, AND MEANS FOR MAINTAINING A VACUMM IN SAID TOWER AND SAID REACTION TUBE.
Claim 2
Dependent Claim
93 words
APPARATUS FOR CONTINUOUS POLYCONDENSATION REACTIONS COMPRISING AN INCLINED, CLOSED REATION TUBE SUBDIVIDED BY BAFFLES INTO COMPARTMENTS WITH A VAPOR SPACE ABOVE SAID COMPARTMENTS, A ROTATABLE AGITATOR IN SAID COMPARTMENTS, MEANS FOR HEATING SAID REACTION TUBE, A DISCHARGE PIPE IN THE LOWERMOST END OF SAID REACTION TUBE, A ROTATABLE WORM POSITIONED IN SAID PIPE, MEANS FOR FEEDING POLYCONDENSABLE CHEMICALS INTO SAID REACTION TUBE AT THE OPPOSITE END THEREOF, A PACKED FRACTIONATION TOWER COMMUNICATING WITH SAID VAPOR SPACE IN SAID REACTION TUBE, AND MEANS FOR MAINTAINING A VACUMM IN SAID TOWER AND SAID REACTION TUBE.
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) | 1968-03-22 | 1968-09-21 | 1969-03-23 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1972-03-22 | 1972-09-21 | 1973-03-23 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1976-03-22 | 1976-09-21 | 1977-03-23 | $7700.00 | Window Closed / Lapsed |