Patent US3065204A successfully refreshed from Google Patents.
US3065204A
Expired / Lapsed
US
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Preparation of solid polycarbonate
Assignee: PPG Industries Inc
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Filing: 1958-08-01
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Granted: 1962-11-20
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Expires: 1978-08-01
Abstract
No abstract record available.
Inventors
- 👤 Joseph J Dietrich
- 👤 Roger D Swigert
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 13:50
CPC Classifications
C; C08; C08G; C08G64/00; C08G64/40
Claims Analysis
Total Claims: 1
Claim 1
Independent Claim
116 words
A METHOD OF PREPARING SOLIF HIGH MOLECULAR WEIGHT POLYCARBONATE COMPOSITION WHICH COMPRISES DILUTING AN ORGANIC SOLVENT SOLUTION OF A HIGH MOLECULAR WEIGHT POLYCARBONATE OF A DIOL WITH LIQUID ORGANIC NON-SOLVENT MISCIBLE WITH THE ORGANIC SOLVENT OF SAID SOLUTION FOR THE POLYCARBONATE OF A DIOL TO THE EXTENT THAT A LIQUID MEDIUM IS FORMED WHICH IS AT ITS POLYCARBONATE CLOUD POINT, ADDING A SMALL AMOUNT OF AT LEAST 0.1 PERCENT BY WEIGHT BASIS THE WEIGHT OF SAID POLYCARBONATE DISSOLVED IN THE LIQUID MEDIUM OF SOLID PARTICULATE HIGH MOLECULAR WEIGHT POLYCARBONATE OF A DIOL TO THIS MEDIUM, AGITATING THIS SOLID CONTAINING MEDIUM, FORMING SOLID GRANULAR POLYCARBONATE OF A DIOL DURING THE AGITATION AND RECOVERING SAID SOLID GRANULAR POLYCARBONATE.
References Cited (Backward Citations)
BE523543A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1965-11-19 | 1966-05-21 | 1966-11-20 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1969-11-19 | 1970-05-21 | 1970-11-20 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1973-11-19 | 1974-05-21 | 1974-11-20 | $7700.00 | Window Closed / Lapsed |