Patent US2116269A successfully refreshed from Google Patents.
Patent US3160602A successfully refreshed from Google Patents.
US3160602A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Process of producing aromatic polyesters
Assignee: General Electric Co
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Filing: 1960-06-01
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Granted: 1964-12-08
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Expires: 1980-06-01
Abstract
No abstract record available.
Inventors
- 👤 Simon W Kantor
- 👤 Fred F Holub
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 18:25
CPC Classifications
C; C08; C08G; C08G63/00; C08G63/02; C08G63/12; C08G63/40; C08G63/16; C08G63/18; C08G63/19; C08G63/20; C08G63/64; C08G63/68; C08G63/682; C08G63/6824; C08G63/6826; H; H01; H01B; H01B3/00; H01B3/18; H01B3/30; H01B3/42; H01B3/421; H01B3/422; H01B3/423
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
116 words
THE PROCESS OF PRODUCING A LINEAR SUPERPOLYESTER OF AN AROMATIC DICARBOXYLIC ACID AND A DIHYDRIC PHENOL WHICH COMPRISES REACTING A MIXTURE OF REACTANTS CONSISTING ESSENTIALLY OF AN AROMATIC DICARBONYL HALIDE AND A DIHYDRIC PHENOL, WHILE THESE REACTANTS ARE DISSOLVED IN A SOLVENT SELECTED FROM THE GROUP CONSISTING OF BENZOPHENONE, M-TERPHENYL, CHLORINATED BIPHENYL, BROMINATED BIPHENYL, CHLORINATED DIPHENYL OXIDE AND BROMINATED DIPHENYL OXIDE, AT A TEMPERATURE IN THE RANGE OF ABOUT 270* C. UP TO THE REFLUX TEMPERATURE OF THE SOLUTION UNTIL AT LEAST THE EVOLUTION OF THE HYDROGEN HALIDE SUBSTANTIALLY CEASES, BY WHICH TIME THE SUPERPOLYESTER FORMED HAS AN INTRINSIC VISCOSITY OF AT LEAST 0.5 MEASURED AT 75*C., AND ISOLATING THE SOLID POLYMER FROM THE REACTION MIXTURE.
Claim 2
Dependent Claim
116 words
THE PROCESS OF PRODUCING A LINEAR SUPERPOLYESTER OF AN AROMATIC DICARBOXYLIC ACID AND A DIHYDRIC PHENOL WHICH COMPRISES REACTING A MIXTURE OF REACTANTS CONSISTING ESSENTIALLY OF AN AROMATIC DICARBONYL HALIDE AND A DIHYDRIC PHENOL, WHILE THESE REACTANTS ARE DISSOLVED IN A SOLVENT SELECTED FROM THE GROUP CONSISTING OF BENZOPHENONE, M-TERPHENYL, CHLORINATED BIPHENYL, BROMINATED BIPHENYL, CHLORINATED DIPHENYL OXIDE AND BROMINATED DIPHENYL OXIDE, AT A TEMPERATURE IN THE RANGE OF ABOUT 270* C. UP TO THE REFLUX TEMPERATURE OF THE SOLUTION UNTIL AT LEAST THE EVOLUTION OF THE HYDROGEN HALIDE SUBSTANTIALLY CEASES, BY WHICH TIME THE SUPERPOLYESTER FORMED HAS AN INTRINSIC VISCOSITY OF AT LEAST 0.5 MEASURED AT 75*C., AND ISOLATING THE SOLID POLYMER FROM THE REACTION MIXTURE.
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) | 1967-12-08 | 1968-06-08 | 1968-12-08 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1971-12-08 | 1972-06-08 | 1972-12-08 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1975-12-08 | 1976-06-08 | 1976-12-08 | $7700.00 | Window Closed / Lapsed |