Patent US2764469A successfully refreshed from Google Patents.
US2764469A
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Solutions of acrylonitrile polymers in mixtures of ethylene carbonate and 1:2-propylene carbonate
Assignee: Acordis UK Ltd
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Filing: 1953-10-07
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Granted: 1956-09-25
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Expires: 1973-10-07
Abstract
No abstract record available.
Inventors
- 👤 Kowolik Ernest Jan
- 👤 Fisher James Wotherspoon
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 20:10
CPC Classifications
C; C08; C08J; C08J3/00; C08J3/02; C08J3/09; C08J3/091; C08J3/095; D; D01; D01F; D01F6/00; D01F6/02; D01F6/18; D01F6/28; D01F6/38; C08J2333/00; C08J2333/18; C08J2333/20
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
52 words
SOLUTIONS OF ACRYLONITRILE POLYMERS WHICH ARE CAPABLE OF BEING COOLED TO TEMPERATURES BELOW 35* C. BEFORE SOLIDIFYING, WHICH COMPRISE AN ACRYLONITRILE POLYMER HAVING AN ACRYLONITRILE CONTENT AT LEAST 85% BY WEIGHT, DISSOLVED IN A SOLVENT MIXTURE CONSISTING ESSENTIALLY OF ETHYLENE CARBONATE AND 1:2-PROPYLENE CARBONATE AND CONTAINING 30-90% BY WEIGHT OF ETHYLENE CARBONATE.
Claim 2
Dependent Claim
52 words
SOLUTIONS OF ACRYLONITRILE POLYMERS WHICH ARE CAPABLE OF BEING COOLED TO TEMPERATURES BELOW 35* C. BEFORE SOLIDIFYING, WHICH COMPRISE AN ACRYLONITRILE POLYMER HAVING AN ACRYLONITRILE CONTENT AT LEAST 85% BY WEIGHT, DISSOLVED IN A SOLVENT MIXTURE CONSISTING ESSENTIALLY OF ETHYLENE CARBONATE AND 1:2-PROPYLENE CARBONATE AND CONTAINING 30-90% BY WEIGHT OF ETHYLENE CARBONATE.
References Cited (Backward Citations)
FR896083A
Cited
US2601255A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1959-09-25 | 1960-03-26 | 1960-09-25 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1963-09-25 | 1964-03-26 | 1964-09-25 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1967-09-25 | 1968-03-26 | 1968-09-25 | $7700.00 | Window Closed / Lapsed |