US3331890A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Sterically hindered segmented copolyesters based on polyethylene terephthalate
Assignee: Eastman Kodak Co
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Filing: 1963-05-06
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Granted: 1967-07-18
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Expires: 1983-05-06
Abstract
No abstract record available.
Inventors
- 👤 John R Caldwell
- 👤 Gilkey Russell
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 19:14
CPC Classifications
C; C08; C08G; C08G63/00; C08G63/78; C08G63/80; C08G63/02; C08G63/12; C08G63/16; C08G63/18; C08G63/199; C08G63/60; C08L; C08L67/00
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
125 words
A SEGMENTED LINEAR CONDENSATION-TYPE COPOLYESTER MELTING BETWEEN ABOUT 240*C. AND 265*C. HAVING A MOLECULAR WEIGHT OF AT LEAST ABOUT 10,000 AND HAVING A SEGMENTED STRUCTURE ESSENTIALLY COMPOSED FO FROM ABOUT 95 TO 60 PERCENT BY WEIGHT OF HARD SEGMENTS AND FROM ABOUT 5 TO 40% BY WEIGHT OF SOFT SEGMENTS IN ALTERNATING SEQUENCE CONNECTED BY ESTER LINKAGES, SAID HARD SEGMENTS BEING COMPOSED OF POLYETHYLENE TEREPHTHALATE HAVING AN AVERAGE MOLECULAR WEIGHT OF AT LEAST 4,000 UP TO ABOUT 40,000 AND SAID SOFT SEGMENTS BEING COMPOSED OF A HOMOPOLYESTER HAVING AN AVERAGE MOLECULAR WEIGHT OF ABOUT 1,500 UP TO ABOUT 25,000 SAID HOMOPOLYESTER BEING COMPOSED OF AT LEAST ONE STERICALLY HINDERED CONSTITUENT, SAID CONSTITUENTS OF SAID HOMOPOLYESTER BEING SELECTED FROM THE GROUP OF POLYESTER CONSTITUENTS CONSISTING OF
Claim 2
Dependent Claim
125 words
A SEGMENTED LINEAR CONDENSATION-TYPE COPOLYESTER MELTING BETWEEN ABOUT 240*C. AND 265*C. HAVING A MOLECULAR WEIGHT OF AT LEAST ABOUT 10,000 AND HAVING A SEGMENTED STRUCTURE ESSENTIALLY COMPOSED FO FROM ABOUT 95 TO 60 PERCENT BY WEIGHT OF HARD SEGMENTS AND FROM ABOUT 5 TO 40% BY WEIGHT OF SOFT SEGMENTS IN ALTERNATING SEQUENCE CONNECTED BY ESTER LINKAGES, SAID HARD SEGMENTS BEING COMPOSED OF POLYETHYLENE TEREPHTHALATE HAVING AN AVERAGE MOLECULAR WEIGHT OF AT LEAST 4,000 UP TO ABOUT 40,000 AND SAID SOFT SEGMENTS BEING COMPOSED OF A HOMOPOLYESTER HAVING AN AVERAGE MOLECULAR WEIGHT OF ABOUT 1,500 UP TO ABOUT 25,000 SAID HOMOPOLYESTER BEING COMPOSED OF AT LEAST ONE STERICALLY HINDERED CONSTITUENT, SAID CONSTITUENTS OF SAID HOMOPOLYESTER BEING SELECTED FROM THE GROUP OF POLYESTER CONSTITUENTS CONSISTING OF
References Cited (Backward Citations)
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Cited
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US2901466A
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FR1303888A
Cited
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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) | 1970-07-17 | 1971-01-16 | 1971-07-18 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1974-07-17 | 1975-01-16 | 1975-07-18 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1978-07-17 | 1979-01-16 | 1979-07-18 | $7700.00 | Window Closed / Lapsed |