US3399170A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Process for the preparation of linear thermoplastic polyesters with freezing temperatures above 100u deg. c.
Assignee: Chemische Werke Witten GmbH
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Filing: 1963-07-29
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Granted: 1968-08-27
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Expires: 1983-07-29
Abstract
No abstract record available.
Inventors
- 👤 Blaschke Franz
- 👤 Schade Gerhard
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 12:02
CPC Classifications
C; C08; C08G; C08G63/00; C08G63/02; C08G63/12; C08G63/16; C08G63/18; C08G63/19; C08G63/193; C08G63/191; C08G63/199
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
127 words
A PROCESS FOR THE PREPARATION OF LINEAR, THERMOPLASTIC POLYESTERS HAVING FREEZING TEMPERATURES ABOVE 100* C. WHICH CONSISTS OF HEATING A MIXTURE CONSISTING OF EQUIMOLECULAR AMOUNTS OF (A) AN ARYL ESTER SELECTED FROM THE GROUP CONSISTING OF THE PHENYL, CRESYL, XYLENYL AND NAPHTHYL ESTERS OF TEREPHTHALIC ACID, ISOPHTHALIC ACID AND MIXTURES THEREOF WITH (B) A MIXING CONSISTING OF BETWEEN APPROXIMATELY 90 AND 70 MOL PERCENT OF A DIPHENOL AND BETWEEN APPROXIMATELY 10 AND 30 MOL PERCENT OF A GLYCOL IN THE PRESENCE OF A POLYCONDENSATION CATALYST AND IN THE ABSENCE OF A SOLVENT FOR SUCH A LENGTH OF TIME AND WHILE DISCHARGING EASILY VOLATILE REACTION PRODUCTS UNTIL A PRODUCT HAS BEEN FORMED HAVING A FREEZING TEMPERATURE RANGE OF ABOUT 109-158*C. AND A MELTING POINT RANGE OF ABOUT 128-250*C.
Claim 2
Dependent Claim
127 words
A PROCESS FOR THE PREPARATION OF LINEAR, THERMOPLASTIC POLYESTERS HAVING FREEZING TEMPERATURES ABOVE 100* C. WHICH CONSISTS OF HEATING A MIXTURE CONSISTING OF EQUIMOLECULAR AMOUNTS OF (A) AN ARYL ESTER SELECTED FROM THE GROUP CONSISTING OF THE PHENYL, CRESYL, XYLENYL AND NAPHTHYL ESTERS OF TEREPHTHALIC ACID, ISOPHTHALIC ACID AND MIXTURES THEREOF WITH (B) A MIXING CONSISTING OF BETWEEN APPROXIMATELY 90 AND 70 MOL PERCENT OF A DIPHENOL AND BETWEEN APPROXIMATELY 10 AND 30 MOL PERCENT OF A GLYCOL IN THE PRESENCE OF A POLYCONDENSATION CATALYST AND IN THE ABSENCE OF A SOLVENT FOR SUCH A LENGTH OF TIME AND WHILE DISCHARGING EASILY VOLATILE REACTION PRODUCTS UNTIL A PRODUCT HAS BEEN FORMED HAVING A FREEZING TEMPERATURE RANGE OF ABOUT 109-158*C. AND A MELTING POINT RANGE OF ABOUT 128-250*C.
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) | 1971-08-27 | 1972-02-26 | 1972-08-27 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1975-08-27 | 1976-02-26 | 1976-08-27 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1979-08-27 | 1980-02-26 | 1980-08-27 | $7700.00 | Window Closed / Lapsed |