Patent US2569915A successfully refreshed from Google Patents.
US3264262A
Expired / Lapsed
US
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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
- 👤 John V Bailey
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 07:56
CPC Classifications
C; C08; C08J; C08J3/00; C08J3/12; C08J3/14; C08J2369/00; Y; Y10; Y10S; Y10S159/00; Y10S159/10
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
115 words
A CONTINUOUS PROCESS FOR SEPARATING POLYCARBONATE FROM ITS SOLVENT IN SOLUTION THEREOF WHICH COMPRISES CONTINUOUSLY MIXING IN A MIXING MEANS A POLYCARBONATE SOLUTION AND A PRECIPITATING SOLUTION, SAID PRECIPITATING SOLUTION COMPRISING A POLYCARBONATE SOLVENT AND A POLYCABONATE NON-SOLVENT, SAID SOLVENT BEING MISCIBLE WITH AND HAVING A BOILING POINT LOWER THAN THE BOILING POINT OF SAID NON-SOLVENT 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 POLYCARBONATE SOLVENT AND FROM ABOUT 35 TO 65 PARTS BY WEIGHT OF POLYCARBONATE NON-SOLVENT, REMOVING FROM THE RESULTING MIXTURE SAID PRICIPITATED POLYCARBONATE AND THAT AMOUNT OF POLYCARBONATE SOLVENT WHICH WAS INITIALLY ADDED
Claim 2
Dependent Claim
115 words
A CONTINUOUS PROCESS FOR SEPARATING POLYCARBONATE FROM ITS SOLVENT IN SOLUTION THEREOF WHICH COMPRISES CONTINUOUSLY MIXING IN A MIXING MEANS A POLYCARBONATE SOLUTION AND A PRECIPITATING SOLUTION, SAID PRECIPITATING SOLUTION COMPRISING A POLYCARBONATE SOLVENT AND A POLYCABONATE NON-SOLVENT, SAID SOLVENT BEING MISCIBLE WITH AND HAVING A BOILING POINT LOWER THAN THE BOILING POINT OF SAID NON-SOLVENT 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 POLYCARBONATE SOLVENT AND FROM ABOUT 35 TO 65 PARTS BY WEIGHT OF POLYCARBONATE NON-SOLVENT, REMOVING FROM THE RESULTING MIXTURE SAID PRICIPITATED POLYCARBONATE AND THAT AMOUNT OF POLYCARBONATE SOLVENT WHICH WAS INITIALLY ADDED
References Cited (Backward Citations)
US3065204A
Cited
US3144432A
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 |