US2657973A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Process for wet-spinning cellulose triacetate
Assignee: Acordis UK Ltd
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Filing: 1950-09-09
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Granted: 1953-11-03
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Expires: 1970-09-09
Abstract
No abstract record available.
Inventors
- 👤 Johnson Edgar Bertie
- 👤 Webster John Frederick
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 17:22
CPC Classifications
D; D01; D01F; D01F2/00; D01F2/24; D01F2/28
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
73 words
PROCESS FOR THE PRODUCTION OF SHAPED ARTICLES FROM CELLULOSE TRIACETATE, WHICH COMPRISES EXTRUDING A SOLUTION OF CELLULOSE TRIACETATE IN A SOLVENT MIXTURE COMPRISING 75-50% BY VOLUME OF A CHLORINATED HYDROCARBON SELECTED FROM THE GROUP WHICH CONSISTS OF METHYLENE CHLORIDE AND TO ETHYLENE CHLORIDE AND 25-50% BY VOLUME OF ACETIC ACID INTO A COAGULATING BATH WHICH COMPRISES AS THE MAIN CONSTITUENT AN ALIPHATIC ALCOHOL CONTAINING AT LEAST MOST 4 CARBON ATOMS IN THE MOLECULE.
Claim 2
Dependent Claim
73 words
PROCESS FOR THE PRODUCTION OF SHAPED ARTICLES FROM CELLULOSE TRIACETATE, WHICH COMPRISES EXTRUDING A SOLUTION OF CELLULOSE TRIACETATE IN A SOLVENT MIXTURE COMPRISING 75-50% BY VOLUME OF A CHLORINATED HYDROCARBON SELECTED FROM THE GROUP WHICH CONSISTS OF METHYLENE CHLORIDE AND TO ETHYLENE CHLORIDE AND 25-50% BY VOLUME OF ACETIC ACID INTO A COAGULATING BATH WHICH COMPRISES AS THE MAIN CONSTITUENT AN ALIPHATIC ALCOHOL CONTAINING AT LEAST MOST 4 CARBON ATOMS IN THE MOLECULE.
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) | 1956-11-02 | 1957-05-04 | 1957-11-03 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1960-11-02 | 1961-05-04 | 1961-11-03 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1964-11-02 | 1965-05-04 | 1965-11-03 | $7700.00 | Window Closed / Lapsed |