US2706722A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Preparation of anhydrous linear polyester compositions and shaping thereof into useful products
Assignee: Eastman Kodak Co
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Filing: 1952-03-06
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Granted: 1955-04-19
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Expires: 1972-03-06
Abstract
No abstract record available.
Inventors
- 👤 John R Caldwell
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 18:29
CPC Classifications
C; C08; C08G; C08G63/00; C08G63/88; C08G63/90
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
104 words
A PROCESS FOR PREPARING A COMPOSITION COMPRISING A GRANULATED LINEAR POLYESTER OF A POLYCARBOXYLIC ACID AND A POLYHYDRIC ALCOHOL HAVING A MELTING POINT ABOVE 150*C. CONTAINING LESS THAN 0.01% OF WATER WHICH COMPRISES ADMIXING SMALL PARTICLES OF A LINEAR POLYESTER HAVING A MELTING POINT ABOVE 150*C. WITH A LIQUID HAVING A BOILING POINT IN THE RANGE OF ABOUT 100*C. TO ABOUT 200*C. WHICH HAS A RELATIVELY LOW SOLUBILITY FOR WATER AND IS INERT TOWARD THE POLYESTER PARTICLES AT NEAR ITS BOILING POINT, AND SUBJECTING THIS ADMIXTURE TO A DISTILLATION OPERATION FOR A PERIOD OF TIME SUFFICIENT TO SUBSTANTIALLY ELIMINATE ALL WATER FROM THE ADMIXTURE.
Claim 2
Dependent Claim
104 words
A PROCESS FOR PREPARING A COMPOSITION COMPRISING A GRANULATED LINEAR POLYESTER OF A POLYCARBOXYLIC ACID AND A POLYHYDRIC ALCOHOL HAVING A MELTING POINT ABOVE 150*C. CONTAINING LESS THAN 0.01% OF WATER WHICH COMPRISES ADMIXING SMALL PARTICLES OF A LINEAR POLYESTER HAVING A MELTING POINT ABOVE 150*C. WITH A LIQUID HAVING A BOILING POINT IN THE RANGE OF ABOUT 100*C. TO ABOUT 200*C. WHICH HAS A RELATIVELY LOW SOLUBILITY FOR WATER AND IS INERT TOWARD THE POLYESTER PARTICLES AT NEAR ITS BOILING POINT, AND SUBJECTING THIS ADMIXTURE TO A DISTILLATION OPERATION FOR A PERIOD OF TIME SUFFICIENT TO SUBSTANTIALLY ELIMINATE ALL WATER FROM THE ADMIXTURE.
References Cited (Backward Citations)
US2460582A
Cited
US2597643A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1958-04-18 | 1958-10-18 | 1959-04-19 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1962-04-18 | 1962-10-18 | 1963-04-19 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1966-04-18 | 1966-10-18 | 1967-04-19 | $7700.00 | Window Closed / Lapsed |