US2823188A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Plastic materials comprising dextran and method of preparation
Assignee: Commonwealth Engineering Company of Ohio
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Filing: 1954-06-07
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Granted: 1958-02-11
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Expires: 1974-06-07
Abstract
No abstract record available.
Inventors
- 👤 Leo J Novak
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 06:50
CPC Classifications
C; C08; C08L; C08L5/00; C08L5/02; C08G; C08G63/00; C08G63/02; C08G63/12; C08G63/46
Claims Analysis
Total Claims: 1
Claim 1
Independent Claim
76 words
A PLASTIC MATERIAL SETTABLE BY COOLING AND FORMED BY THE INTERACTION OF FROM 30% TO 75% BY WEIGHT OF A SUBSTANCE SELECTED FROM THE GROUP CONSISTING OF ALPHAUNSATURATED ALPHA, BETA-POLHCARBOXLIC ACIDS AND ANHYDRIDES THEREOF, AND FROM 15% TO 60% BY WEIGHT OF A POLYHYDRIC ALCOHOL SELECTED FROM THE GROUP CONSISTING OF ETNYLENE GLYCOL, DIETHYLENE GLYCOL, TRIETHYLENE GLYCOL, TETRAETHYLENE GLYCOL, TRIMETHYLENE GLYCOL, GLYCEROL AND PENTAERYTHRITOL IN THE PRESENCE OF FROM 5% TO 25% BY WEIGHT OF DEXTRAN.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1961-02-10 | 1961-08-12 | 1962-02-11 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1965-02-10 | 1965-08-12 | 1966-02-11 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1969-02-10 | 1969-08-12 | 1970-02-11 | $7700.00 | Window Closed / Lapsed |