Patent US2979486A successfully refreshed from Google Patents.
US2979486A
Expired / Lapsed
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Linear polyesters and process of preparing the same
Assignee: Wyeth Holdings LLC
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Filing: 1958-08-04
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Granted: 1961-04-11
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Expires: 1978-08-04
Abstract
No abstract record available.
Inventors
- 👤 John C Petropoulos
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 22:46
CPC Classifications
C; C08; C08G; C08G63/00; C08G63/02; C08G63/12; C08G63/16; C08G63/18; C08G63/181; C08G63/185
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
43 words
A POLYESTER RESIN RESULTING FROM THE REACTION OF FROM ABOUT 1 TO 6 MOLS OF ETHYLENE GLYCOL AND AN UNSUBSTITUTED BUTYLIDENE BIS BENZOIC ACID TO AN ACID NUMBER OF LESS THAN 0.5 AND HAVING AN INTRINSIC VISCOSITY BETWEEN 0.32 AND 0.55 IN BENZENE.
Claim 2
Dependent Claim
43 words
A POLYESTER RESIN RESULTING FROM THE REACTION OF FROM ABOUT 1 TO 6 MOLS OF ETHYLENE GLYCOL AND AN UNSUBSTITUTED BUTYLIDENE BIS BENZOIC ACID TO AN ACID NUMBER OF LESS THAN 0.5 AND HAVING AN INTRINSIC VISCOSITY BETWEEN 0.32 AND 0.55 IN BENZENE.
References Cited (Backward Citations)
US2720505A
Cited
US2794822A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1964-04-10 | 1964-10-10 | 1965-04-11 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1968-04-10 | 1968-10-10 | 1969-04-11 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1972-04-10 | 1972-10-10 | 1973-04-11 | $7700.00 | Window Closed / Lapsed |