US3144432A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Polycarbonate polymerization process
Assignee: General Electric Co
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Filing: 1961-08-18
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Granted: 1964-08-11
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Expires: 1981-08-18
Abstract
No abstract record available.
Inventors
- 👤 Daniel W Fox
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 05:48
CPC Classifications
C; C08; C08G; C08G64/00; C08G64/20; C08G64/22; C08G64/24
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
90 words
A PROCESS FOR THE PREPARATION OF LINEAR AROMATIC POLYMERS COMPRISING (1) PASSING A CARBONYL HALIDE INTO A SOLUTION COMPRISING A DIHYDRIC PHENOL, CHLOROBENZENE AND PYRIDINE TO FORM A REACTION MIXTURE CONTAINING PYRIDINE HYDROCHLORIDE AND A SOLUTION OF THE CARBONATE POLYMER IN CHLOROBENZENE, SUBSTANTIALLY ALL OF THE PYRIDINE HYDROCHLORIDE BEING PRESENT AS A PRECIPITATE, (2) SEPARATING THE PRECIPITATED PYRIDINE HYDROCHLORIDE FROM THE REACTION MIXTURE, (3) DISTILLING THE SOLUTION OF THE CARBONATE POLYMER IN THE CHLOROBENZENE TO REMOVE SUBSTANTIALLY ALL RESIDUAL PYRIDINE HYDROCHLORIDE, AND (4) SEPARATING THE CARBONATE POLMYER FROM THE CHLOROBENZENE.
Claim 2
Dependent Claim
90 words
A PROCESS FOR THE PREPARATION OF LINEAR AROMATIC POLYMERS COMPRISING (1) PASSING A CARBONYL HALIDE INTO A SOLUTION COMPRISING A DIHYDRIC PHENOL, CHLOROBENZENE AND PYRIDINE TO FORM A REACTION MIXTURE CONTAINING PYRIDINE HYDROCHLORIDE AND A SOLUTION OF THE CARBONATE POLYMER IN CHLOROBENZENE, SUBSTANTIALLY ALL OF THE PYRIDINE HYDROCHLORIDE BEING PRESENT AS A PRECIPITATE, (2) SEPARATING THE PRECIPITATED PYRIDINE HYDROCHLORIDE FROM THE REACTION MIXTURE, (3) DISTILLING THE SOLUTION OF THE CARBONATE POLYMER IN THE CHLOROBENZENE TO REMOVE SUBSTANTIALLY ALL RESIDUAL PYRIDINE HYDROCHLORIDE, AND (4) SEPARATING THE CARBONATE POLMYER FROM THE CHLOROBENZENE.
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) | 1967-08-11 | 1968-02-10 | 1968-08-11 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1971-08-11 | 1972-02-10 | 1972-08-11 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1975-08-11 | 1976-02-10 | 1976-08-11 | $7700.00 | Window Closed / Lapsed |