US3219627A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Linear polyesters of 9,9-fluorenedicarboxylic acids and a method for the preparation thereof
Assignee: Union Carbide Corp
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Filing: 1961-06-30
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Granted: 1965-11-23
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Expires: 1981-06-30
Abstract
No abstract record available.
Inventors
- 👤 Onofrio Anthony A D
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 09:50
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
70 words
LINEAR, AMORPHOUS THERMOPLASTIC POLYESTERS HAVING A REDUCED VISCOSITY OF ABOUT 0.2 TO ABOUT 3.5, SAID VISCOSITY DETERMINED AT 25*C. ON A SOLUTION HAVING A CONCENTRATION OF 0.2 GRAM OF THE POLYESTER PER 100 MILILITERS OF A MIXTURE OF 60 PERCENT BY WEIGHT PHENOL AND 40 PERCENT BY WEIGHT TETRACHLOROETHANE, HAVING HEAT DISTORTION TEMPERATURES GREATER THAN 100*C. AND CONSISTING ESSENTIALLY OF A PLURALITY OF RECURRING STRUCTRUAL UNITS OF THE GENERAL FORMULA:
Claim 2
Dependent Claim
70 words
LINEAR, AMORPHOUS THERMOPLASTIC POLYESTERS HAVING A REDUCED VISCOSITY OF ABOUT 0.2 TO ABOUT 3.5, SAID VISCOSITY DETERMINED AT 25*C. ON A SOLUTION HAVING A CONCENTRATION OF 0.2 GRAM OF THE POLYESTER PER 100 MILILITERS OF A MIXTURE OF 60 PERCENT BY WEIGHT PHENOL AND 40 PERCENT BY WEIGHT TETRACHLOROETHANE, HAVING HEAT DISTORTION TEMPERATURES GREATER THAN 100*C. AND CONSISTING ESSENTIALLY OF A PLURALITY OF RECURRING STRUCTRUAL UNITS OF THE GENERAL 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) | 1968-11-22 | 1969-05-24 | 1969-11-23 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1972-11-22 | 1973-05-24 | 1973-11-23 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1976-11-22 | 1977-05-24 | 1977-11-23 | $7700.00 | Window Closed / Lapsed |