US2890208A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Preparation of lactone polyesters
Assignee: Union Carbide Corp
•
Filing: 1956-04-13
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Granted: 1959-06-09
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Expires: 1976-04-13
Abstract
No abstract record available.
Inventors
- 👤 Donald M Young
- 👤 Hostettler Fritz
- 👤 Christian F Horn
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-22 17:34
CPC Classifications
C; C08; C08G; C08G63/00; C08G63/78; C08G63/82; C08G63/823
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
113 words
IN A METHOD OF PREPARING A POLYESTER BY REACTING, AT A TEMPERATURE UP TOI ABOUT 300* C,. A LACTONE HAVING FROM SIX TO EIGHT CARBON ATOMS IN THE RING WITH AN ORGANIC COMPOUND HAVING AT LEAST ONE REACTIVE SITE CAPABLE OF OPENING THE LACTONE RING IN A RADICCAL SELECTED FROM THE GROUP CONSISTING OF HYDROXYL AND AMINON RADICALS ATTACHED THERETO, THE IMPROVEMENT WHICH COMPRISES CARRYING OUT THE REACTION IN THE PRESENCE OF BETWEEN ABOUT 0.001 AND 1% BY WEIGHT, BASED ON THE WEIGHT OF LACTONE, OF A CATALYST SELECTED FROM THE GROUP CONSISTING OF ORGANIC TIN COMPOUNDS HAVING AT LEAST ONE CARBON TO TIN BOND AND CARBOXYLIC ACID SALTS OF LEAD AND MANGANESE.
Claim 2
Dependent Claim
113 words
IN A METHOD OF PREPARING A POLYESTER BY REACTING, AT A TEMPERATURE UP TOI ABOUT 300* C,. A LACTONE HAVING FROM SIX TO EIGHT CARBON ATOMS IN THE RING WITH AN ORGANIC COMPOUND HAVING AT LEAST ONE REACTIVE SITE CAPABLE OF OPENING THE LACTONE RING IN A RADICCAL SELECTED FROM THE GROUP CONSISTING OF HYDROXYL AND AMINON RADICALS ATTACHED THERETO, THE IMPROVEMENT WHICH COMPRISES CARRYING OUT THE REACTION IN THE PRESENCE OF BETWEEN ABOUT 0.001 AND 1% BY WEIGHT, BASED ON THE WEIGHT OF LACTONE, OF A CATALYST SELECTED FROM THE GROUP CONSISTING OF ORGANIC TIN COMPOUNDS HAVING AT LEAST ONE CARBON TO TIN BOND AND CARBOXYLIC ACID SALTS OF LEAD AND MANGANESE.
References Cited (Backward Citations)
US2153801A
Cited
US2361036A
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US2555385A
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US2455731A
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US2720505A
Cited
US2720507A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1962-06-08 | 1962-12-08 | 1963-06-09 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1966-06-08 | 1966-12-08 | 1967-06-09 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1970-06-08 | 1970-12-08 | 1971-06-09 | $7700.00 | Window Closed / Lapsed |