US3264264A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Polycarbonate recovery system
Assignee: Bayer Corp
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Filing: 1963-05-22
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Granted: 1966-08-02
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Expires: 1983-05-22
Abstract
No abstract record available.
Inventors
- 👤 Peter J Baker
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 12:36
CPC Classifications
C; C08; C08J; C08J3/00; C08J3/12; C08J3/14; C08J2369/00
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
163 words
A CONTINUOUS PROCESS FOR SEPARATING POLYCARBONATE FROM ITS SOLVENT IN A SOLUTION WHICH COMPRISES CONTINUOUSLY MIXING IN A MIXING MEANS A POLYCARBONATE SOLUTION AND A PRECIPITATING SOLUTION, SAID PRECIPITATING SOLUTION COMPRISING A POLYCARBONATE SOLVENT AND A POLYCARBONATE NON-SOLVENT, SAID SOLVENT BEING MISCIBLE WITH AND HAVING A BOILING POINT LOWER THAN THE BOILING POINT OF SAID NON-SOLVENT, MAINTAINING A TEMPERATURE DURING SAID MIXING OF AT LEAST ABOVE THE BOILING POINT OF SAID POLYCARBONATE SOLVENT, WHILE CONCURRENTLY REMOVING FROM SAID MIXING VESSEL SUBSTANTIALLY THAT AMOUNT OF SOLVENT WHICH IS INTRODUCED TO SAID MIXING VESSEL VIA SAID POLYCARBONATE SOLUTION TO FORM A MIXTURE CONTAINING FROM ABOUT 1 TO ABOUT 15 PARTS BY WEIGHT OF PRECIPITATED POLYCARBONATE, FROM ABOUT 35 TO ABOUT 65 PARTS BY WEIGHT OF SOLVENT AND FROM ABOUT 35 TO ABOUT 65 PARTS BY WEIGHT OF POLYCARBONATE NON-SOLVENT, SEPARATING FROM THE RESULTING MIXTURE SAID PRECIPITATED POLYCARBONATE AND CONTINUOUSLY RECYCLING THE REMAINING SOLUTION TO SAID MIXING MEANS WHERE IT IS MIXTED WITH FRESH POLYCARBONATE SOLUTION.
Claim 2
Dependent Claim
163 words
A CONTINUOUS PROCESS FOR SEPARATING POLYCARBONATE FROM ITS SOLVENT IN A SOLUTION WHICH COMPRISES CONTINUOUSLY MIXING IN A MIXING MEANS A POLYCARBONATE SOLUTION AND A PRECIPITATING SOLUTION, SAID PRECIPITATING SOLUTION COMPRISING A POLYCARBONATE SOLVENT AND A POLYCARBONATE NON-SOLVENT, SAID SOLVENT BEING MISCIBLE WITH AND HAVING A BOILING POINT LOWER THAN THE BOILING POINT OF SAID NON-SOLVENT, MAINTAINING A TEMPERATURE DURING SAID MIXING OF AT LEAST ABOVE THE BOILING POINT OF SAID POLYCARBONATE SOLVENT, WHILE CONCURRENTLY REMOVING FROM SAID MIXING VESSEL SUBSTANTIALLY THAT AMOUNT OF SOLVENT WHICH IS INTRODUCED TO SAID MIXING VESSEL VIA SAID POLYCARBONATE SOLUTION TO FORM A MIXTURE CONTAINING FROM ABOUT 1 TO ABOUT 15 PARTS BY WEIGHT OF PRECIPITATED POLYCARBONATE, FROM ABOUT 35 TO ABOUT 65 PARTS BY WEIGHT OF SOLVENT AND FROM ABOUT 35 TO ABOUT 65 PARTS BY WEIGHT OF POLYCARBONATE NON-SOLVENT, SEPARATING FROM THE RESULTING MIXTURE SAID PRECIPITATED POLYCARBONATE AND CONTINUOUSLY RECYCLING THE REMAINING SOLUTION TO SAID MIXING MEANS WHERE IT IS MIXTED WITH FRESH POLYCARBONATE SOLUTION.
References Cited (Backward Citations)
US2989503A
Cited
GB897201A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1969-08-01 | 1970-01-31 | 1970-08-02 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1973-08-01 | 1974-01-31 | 1974-08-02 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1977-08-01 | 1978-01-31 | 1978-08-02 | $7700.00 | Window Closed / Lapsed |