US3407112A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Polyethylene terepthalate film and process of preparation thereof
Assignee: EIDP Inc
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Filing: 1963-04-09
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Granted: 1968-10-22
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Expires: 1983-04-09
Abstract
No abstract record available.
Inventors
- 👤 Karickhoff Michael
- 👤 Miller Conrad Erve
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 14:53
CPC Classifications
C; C08; C08G; C08G63/00; C08G63/02; C08G63/12; C08G63/16; C08G63/18; C08G63/181; C08G63/183
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
91 words
IN A PROCESS FOR THE PRODUCTION OF POLYMERIC ESTER FILM WHEREIN FILM-FORMING POLYMERIC ESTER POLYMER DERIVED BY REACTING A POLYMETHYLENE GLYCOL OF THE FORMULA HO(CH2)OH WHEREIN N IS A POSITIVE INTEGER FROM 2-10 WITH AN AICIDIC COMPONENT SELECTED FROM THE GROUP CONSISTING OF TEREPHTHALIC ACID AND ALKYL ESTER THEREOF, SAID ALKYL GROUPS HAVING 1-7 CARBON ATOMS, AND POLYMERIZING THE RESULTING GLYCOL ESTER TO FORM A POLYESTER, THE IMPROVEMENT COMPRISING; ADDING TO SAID GLYCOL ESTER AT A POINT BEFORE THE INTRINSIC VISCOSITY EXCEEDS 0.2, A BRANCHED CHAIN ALKYLENE GLYCOL OF THE FORMULA
Claim 2
Dependent Claim
91 words
IN A PROCESS FOR THE PRODUCTION OF POLYMERIC ESTER FILM WHEREIN FILM-FORMING POLYMERIC ESTER POLYMER DERIVED BY REACTING A POLYMETHYLENE GLYCOL OF THE FORMULA HO(CH2)OH WHEREIN N IS A POSITIVE INTEGER FROM 2-10 WITH AN AICIDIC COMPONENT SELECTED FROM THE GROUP CONSISTING OF TEREPHTHALIC ACID AND ALKYL ESTER THEREOF, SAID ALKYL GROUPS HAVING 1-7 CARBON ATOMS, AND POLYMERIZING THE RESULTING GLYCOL ESTER TO FORM A POLYESTER, THE IMPROVEMENT COMPRISING; ADDING TO SAID GLYCOL ESTER AT A POINT BEFORE THE INTRINSIC VISCOSITY EXCEEDS 0.2, A BRANCHED CHAIN ALKYLENE GLYCOL OF THE FORMULA
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) | 1971-10-22 | 1972-04-22 | 1972-10-22 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1975-10-22 | 1976-04-22 | 1976-10-22 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1979-10-22 | 1980-04-22 | 1980-10-22 | $7700.00 | Window Closed / Lapsed |