US3267074A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Process for producing polycarbonates
Assignee: Bayer Corp
•
Filing: 1962-11-02
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Granted: 1966-08-16
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Expires: 1982-11-02
Abstract
No abstract record available.
Inventors
- 👤 Noel V Wood
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 15:48
CPC Classifications
C; C08; C08J; C08J3/00; C08J3/12; C08J3/14; C08G; C08G64/00; C08G64/40; C08J2369/00; Y; Y10; Y10S; Y10S159/00; Y10S159/10
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
107 words
A METHOD FOR RECOVERING SOLID POLYCARBONATE HAVING A HIGH BULK DENSITY FROM A SOLUTION THEREOF WHICH COMPRISES INTRODUCING CONCURRENTLY INTO A HIGH SPEED SHEARING CHAMBER A POLYCARBONATE SOLUTION AND A TURBULENT STREAM OF POLYCARBONATE NON-SOLVENT HEATED ABOVE THE BOILING POINT OF THE POLYCARBONATE SOLVENT AND HAVING A REYNOLDS NUMBER OF AT LEAST 1,500 TO FORM A MIXTURE COMPRISING POLYCARBONATE PARTICLES, POLYCARBONATE SOLVENT AND POLYCARBONATE NON-SOLVENT AND THEREAFTER PASSING SAID MIXTURE TO A SEPARATE VESSEL CONTAINING A POLYCARBONATE NON-SOLVENT MAINTAINED AT A TEMPERATURE ABOVE THE BOILING POINT OF THE POLYCARBONATE SOLVENT TO REMOVE SAID POLYCARBONATE SOLVENT AND FORM A POLYCARBONATE-NON-SOLVENT SLURRY AND THEREAFTER RECOVERING POLYCARBONATE FROM SAID SLURRY.
Claim 2
Independent Claim
107 words
A METHOD FOR RECOVERING SOLID POLYCARBONATE HAVING A HIGH BULK DENSITY FROM A SOLUTION THEREOF WHICH COMPRISES INTRODUCING CONCURRENTLY INTO A HIGH SPEED SHEARING CHAMBER A POLYCARBONATE SOLUTION AND A TURBULENT STREAM OF POLYCARBONATE NON-SOLVENT HEATED ABOVE THE BOILING POINT OF THE POLYCARBONATE SOLVENT AND HAVING A REYNOLDS NUMBER OF AT LEAST 1,500 TO FORM A MIXTURE COMPRISING POLYCARBONATE PARTICLES, POLYCARBONATE SOLVENT AND POLYCARBONATE NON-SOLVENT AND THEREAFTER PASSING SAID MIXTURE TO A SEPARATE VESSEL CONTAINING A POLYCARBONATE NON-SOLVENT MAINTAINED AT A TEMPERATURE ABOVE THE BOILING POINT OF THE POLYCARBONATE SOLVENT TO REMOVE SAID POLYCARBONATE SOLVENT AND FORM A POLYCARBONATE-NON-SOLVENT SLURRY AND THEREAFTER RECOVERING POLYCARBONATE FROM SAID SLURRY.
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) | 1969-08-15 | 1970-02-14 | 1970-08-16 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1973-08-15 | 1974-02-14 | 1974-08-16 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1977-08-15 | 1978-02-14 | 1978-08-16 | $7700.00 | Window Closed / Lapsed |