US2497315A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Oxygenated organic polymers
Assignee: EIDP Inc
•
Filing: 1944-12-30
•
Granted: 1950-02-14
•
Expires: 1964-12-30
Abstract
No abstract record available.
Inventors
- 👤 Donald J Loder
- 👤 William F Gresham
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 17:17
CPC Classifications
C; C10; C10G; C10G73/00; C10G73/02; C10G73/06; C08; C08G; C08G2/00; C08G2/06; C08G4/00
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
84 words
A PROCESS FOR THE PREPARATION OF SOLID POLYMERS FROM GLYCOLS AND 1,3-DIOXOLANE CONTAINING AT LEAST TWO GROUPS HAVING THE STRUCTURE -CH2-OCH2CH2O- WHICH COMPRISES REACTING IN SOLUTION UNDER SUBSTANTIALLY ANHYDROUS CONDITIONS FROM ABOUT 48 TO 740 PARTS BY WEIGHT OF 1,3-DIOXOLANE PER PART BY WEIGHT OF A GLYCOL CONTAINING UP TO AND INCLUDING 8 CARBON ATOMS IN THE PRESENCE OF AT LEAST 0.0001% BY WEIGHT OF AN ACIDIC CATALYST, AFTER THE SOLID POLYMER HAS BEEN FORMED NEUTRALIZING THE CATALYST AND THEREAFTER RECOVERING THE POLYMERIC PRODUCTS.
Claim 2
Dependent Claim
84 words
A PROCESS FOR THE PREPARATION OF SOLID POLYMERS FROM GLYCOLS AND 1,3-DIOXOLANE CONTAINING AT LEAST TWO GROUPS HAVING THE STRUCTURE -CH2-OCH2CH2O- WHICH COMPRISES REACTING IN SOLUTION UNDER SUBSTANTIALLY ANHYDROUS CONDITIONS FROM ABOUT 48 TO 740 PARTS BY WEIGHT OF 1,3-DIOXOLANE PER PART BY WEIGHT OF A GLYCOL CONTAINING UP TO AND INCLUDING 8 CARBON ATOMS IN THE PRESENCE OF AT LEAST 0.0001% BY WEIGHT OF AN ACIDIC CATALYST, AFTER THE SOLID POLYMER HAS BEEN FORMED NEUTRALIZING THE CATALYST AND THEREAFTER RECOVERING THE POLYMERIC PRODUCTS.
References Cited (Backward Citations)
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Cited
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Cited
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Cited
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Cited
US2366737A
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1953-02-13 | 1953-08-15 | 1954-02-14 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1957-02-13 | 1957-08-15 | 1958-02-14 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1961-02-13 | 1961-08-15 | 1962-02-14 | $7700.00 | Window Closed / Lapsed |