Patent US2597643A successfully refreshed from Google Patents.
US2597643A
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Manufacture of highly polymeric linear polymethylene terephthalates in solution and precipitation thereof
Assignee: EIDP Inc
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Filing: 1947-10-31
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Granted: 1952-05-20
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Expires: 1967-10-31
Abstract
No abstract record available.
Inventors
- 👤 Izard Emmette Farr
- 👤 Lawrence A Auspos
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 23:29
CPC Classifications
C; C08; C08G; C08G63/00; C08G63/78; C08G63/81
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
73 words
IN THE MANUFACTURE OF HIGHLY POLYMERIC LINEAR POLYMETHYLENE TEREPHTHALATES IN POWDER FORM THE STEPS WHICH COMPRISE POLYMERIZING A POLYMETHYLENE TEREPHTHALATE TO AN INTRINSIC VISCOSITY OF AT LEAST 0.3 IN AN INERT ORGANIC SOLVENT FOR THE POLYMERIC POLYMETHYLENE TEREPHTHALATE SAID SOLVENT HAVING A BOILING POINT ABOUT 160* C., AND THEREAFTER PRECIPITATING SAID POLYMER FROM SOLUTION WHEREBY SAID POLYMER IS OBTAINED DIRECTLY IN FINELY DIVIDED FORM SUITABLE FOR USE IN INJECTION AND EXTRUSION MOLDING APPARATUS.
Claim 2
Dependent Claim
73 words
IN THE MANUFACTURE OF HIGHLY POLYMERIC LINEAR POLYMETHYLENE TEREPHTHALATES IN POWDER FORM THE STEPS WHICH COMPRISE POLYMERIZING A POLYMETHYLENE TEREPHTHALATE TO AN INTRINSIC VISCOSITY OF AT LEAST 0.3 IN AN INERT ORGANIC SOLVENT FOR THE POLYMERIC POLYMETHYLENE TEREPHTHALATE SAID SOLVENT HAVING A BOILING POINT ABOUT 160* C., AND THEREAFTER PRECIPITATING SAID POLYMER FROM SOLUTION WHEREBY SAID POLYMER IS OBTAINED DIRECTLY IN FINELY DIVIDED FORM SUITABLE FOR USE IN INJECTION AND EXTRUSION MOLDING APPARATUS.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1955-05-20 | 1955-11-19 | 1956-05-20 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1959-05-20 | 1959-11-19 | 1960-05-20 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1963-05-20 | 1963-11-19 | 1964-05-20 | $7700.00 | Window Closed / Lapsed |