US3161710A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Polymerization process for polyester films
Assignee: EIDP Inc
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Filing: 1961-07-27
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Granted: 1964-12-15
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Expires: 1981-07-27
Abstract
No abstract record available.
Inventors
- 👤 Gilbert M Turner
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 12:58
CPC Classifications
C; C08; C08G; C08G63/00; C08G63/78; C08G63/785; B; B29; B29C; B29C48/00; B29C48/25; B29C48/88; B29C48/911; B29C48/9135; B29C48/9145; B29C48/03; B29C48/07; B29C48/08
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
75 words
IN THE CONDENSATION REACTION OF BIFUNCTIONAL ESTERFORMING MATERIAL IN THE PRESENCE OF CONDENSATION CATALYST WITH EVOLUTION OF VOLATILE BY-PRODUCT TO FORM LINEAR POLYESTERS, THE PROCESS OF POLYMERIZING MATERIAL CONTAINING AT LEAST 75% OF A GLYCOL TEREPHTHALATE WHICH COMPRISES FORMING THE SAID MATERIAL INTO A FILM HAVING A THICKNESS BETWEEN ABOUT 0.1 AND 1 MIL WHILE AT LEST A SUBSTANTIAL PART OF SAID REACTION EVOLVING VOLATILE BY-PRODUCT REMAINS FOR COMPLETION AND THEN POLYMERIZING THE GLYCOL TEREPH-
Claim 2
Dependent Claim
75 words
IN THE CONDENSATION REACTION OF BIFUNCTIONAL ESTERFORMING MATERIAL IN THE PRESENCE OF CONDENSATION CATALYST WITH EVOLUTION OF VOLATILE BY-PRODUCT TO FORM LINEAR POLYESTERS, THE PROCESS OF POLYMERIZING MATERIAL CONTAINING AT LEAST 75% OF A GLYCOL TEREPHTHALATE WHICH COMPRISES FORMING THE SAID MATERIAL INTO A FILM HAVING A THICKNESS BETWEEN ABOUT 0.1 AND 1 MIL WHILE AT LEST A SUBSTANTIAL PART OF SAID REACTION EVOLVING VOLATILE BY-PRODUCT REMAINS FOR COMPLETION AND THEN POLYMERIZING THE GLYCOL TEREPH-
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) | 1967-12-15 | 1968-06-15 | 1968-12-15 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1971-12-15 | 1972-06-15 | 1972-12-15 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1975-12-15 | 1976-06-15 | 1976-12-15 | $7700.00 | Window Closed / Lapsed |