Patent US3293223A successfully refreshed from Google Patents.
US3293223A
Expired / Lapsed
US
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Polyesters from mixtures of naphthalene dicarboxylic acids
Assignee: Sunoco Inc
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Filing: 1964-03-03
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Granted: 1966-12-20
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Expires: 1984-03-03
Abstract
No abstract record available.
Inventors
- 👤 Irl N Duling
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 13:03
CPC Classifications
C; C08; C08G; C08G63/00; C08G63/02; C08G63/12; C08G63/16; C08G63/18; C08G63/181; C08G63/185; C08G63/187; C08G63/189
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
103 words
A CONDENSATION POLYMER OF (A) A MIXTURE SELECTED FROM THE GROUP CONSISTING OF A MIXTURE OF THE 2,6- AND 2,7-ISOMERS OF NAPHTHALENE DICARBOXYLIC ACIDS AND A MIXTURE OF THE LOWER DIALKYL ESTERS OF THE 2,6- AND 2,7-ISOMERS OF NAPHTHALENE DICARBOXYLIC ACIDS AND (B) A DIOL SELECTED FROM THE GROUP CONSISTING OF 1,4-CYCLOHEXANEDIMETHANOL, 1,2-ETHANEDIOL, 1,3-PROPANEDIOL AND 1,4-BUTANEDIOL, THE RELATIVE PROPORTIONS OF THE (A) AND (B) CONSTITUENTS BEING SUCH AS TO FORM A POLYESTER HAVING A MOLECULAR WEIGHT IN THE RANGE OF FROM 2400 TO 24,000 AND THE WEIGHT RATIO OF 2,6-ISOMER TO 2,7-ISOMER IN SAID POLYESTER BEING IN THE RANGE OF 1:3 TO 19:1.
Claim 2
Dependent Claim
103 words
A CONDENSATION POLYMER OF (A) A MIXTURE SELECTED FROM THE GROUP CONSISTING OF A MIXTURE OF THE 2,6- AND 2,7-ISOMERS OF NAPHTHALENE DICARBOXYLIC ACIDS AND A MIXTURE OF THE LOWER DIALKYL ESTERS OF THE 2,6- AND 2,7-ISOMERS OF NAPHTHALENE DICARBOXYLIC ACIDS AND (B) A DIOL SELECTED FROM THE GROUP CONSISTING OF 1,4-CYCLOHEXANEDIMETHANOL, 1,2-ETHANEDIOL, 1,3-PROPANEDIOL AND 1,4-BUTANEDIOL, THE RELATIVE PROPORTIONS OF THE (A) AND (B) CONSTITUENTS BEING SUCH AS TO FORM A POLYESTER HAVING A MOLECULAR WEIGHT IN THE RANGE OF FROM 2400 TO 24,000 AND THE WEIGHT RATIO OF 2,6-ISOMER TO 2,7-ISOMER IN SAID POLYESTER BEING IN THE RANGE OF 1:3 TO 19:1.
References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1969-12-19 | 1970-06-20 | 1970-12-20 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1973-12-19 | 1974-06-20 | 1974-12-20 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1977-12-19 | 1978-06-20 | 1978-12-20 | $7700.00 | Window Closed / Lapsed |