US3133113A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method for preparing polycarbonate esters
Assignee: Texaco Inc
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Filing: 1960-09-27
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Granted: 1964-05-12
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Expires: 1980-09-27
Abstract
No abstract record available.
Inventors
- 👤 John D Malkemus
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 06:33
CPC Classifications
C; C07; C07C; C07C68/00; C07C68/06; C07C68/065; C08; C08G; C08G64/00; C08G64/02; C08G64/0208; C08G64/20; C08G64/30; C08G64/305
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
74 words
A METHOD FOR PREPARING A POLYCARBONATE ESTER WHICH COMPRISES REACTING A GLYCOL WITH A CARBONATE ESTER AT A TEMPERATURE FROM 90* TO ABOUT 135*C. AND IN THE PRESENCE OF FROM ABOUT 0.001% TO ABOUT 1.0% BY WEIGHT, BASED ON SAID GLYCOL, OF A CATALYST COMPOSITION COMPRISING FROM ABOUT 25% TO ABOUT 75% OF ZINC BORATE AND CORRESPONDINGLY FROM ABOUT 75% TO ABOUT 25% OF AN ALKALINE EARTH METAL OXIDE, SAID GLYCOL HAVING THE FORMULA:
Claim 2
Independent Claim
74 words
A METHOD FOR PREPARING A POLYCARBONATE ESTER WHICH COMPRISES REACTING A GLYCOL WITH A CARBONATE ESTER AT A TEMPERATURE FROM 90* TO ABOUT 135*C. AND IN THE PRESENCE OF FROM ABOUT 0.001% TO ABOUT 1.0% BY WEIGHT, BASED ON SAID GLYCOL, OF A CATALYST COMPOSITION COMPRISING FROM ABOUT 25% TO ABOUT 75% OF ZINC BORATE AND CORRESPONDINGLY FROM ABOUT 75% TO ABOUT 25% OF AN ALKALINE EARTH METAL OXIDE, SAID GLYCOL HAVING THE FORMULA:
References Cited (Backward Citations)
US2789968A
Cited
US2787632A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1967-05-12 | 1967-11-11 | 1968-05-12 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1971-05-12 | 1971-11-11 | 1972-05-12 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1975-05-12 | 1975-11-11 | 1976-05-12 | $7700.00 | Window Closed / Lapsed |