US3337670A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Process of recovering the constituents of a polyvinyl chloride coagulating bath
Assignee: Rhovyl SA
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Filing: 1963-10-18
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Granted: 1967-08-22
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Expires: 1983-10-18
Abstract
No abstract record available.
Inventors
- 👤 Gord Louis
- 👤 Michel Fleury
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 19:36
CPC Classifications
D; D01; D01F; D01F13/00; D01F13/04; D01F6/00; D01F6/02; D01F6/08; D01F6/10; Y; Y02; Y02P; Y02P70/00; Y02P70/50; Y02P70/62
Claims Analysis
Total Claims: 3
Claim 1
Independent Claim
124 words
IN A PROCESS FOR THE PRODUCTION OF FILAMENTS OF A VINYL CHLORIDE POLYMER BY EXTRUDING A SOLUTION OF THE POLYMER IN A HIGH BOILING ORGANIC SOLVENT INTO AN AQUEOUS COAGULATING BATH, THE IMPROVEMENT WHICH COMPRISES EMPLOYING AS THE COAGULATING BATH AN AZEOTROPIC MIXTURE OF WATER AND AN ALIPHATIC ALCOHOL, WHICH AZEOTROPIC MIXTURE HAS A BOILING POINT BELOW THAT OF THE SAID SOLVENT AND OF ANY AZEOTROPIC MIXTURE FORMED BY THE SAID SOLVENT WITH A COMPONENT OF THE COAGULATING BATH, FRACTINALLY DISTILLING THE COAGULATING BATH AFTER USE TO SEPARATE THE WATER-ALCOHOL AZEOTROPE FROM HIGH BOILING SOLVENT CONTAINED IN IT, AND RE-USING THE RECOVERED AZEOTROPE AS A COAGULATING BATH AND THE RECOVERED HIGH BOILING SOLVENT AS SPINNING SOLVENT IN THE PRODUCTION OF VINYL CHLORIDE POLYMER FILAMENTS.
Claim 2
Dependent Claim
124 words
IN A PROCESS FOR THE PRODUCTION OF FILAMENTS OF A VINYL CHLORIDE POLYMER BY EXTRUDING A SOLUTION OF THE POLYMER IN A HIGH BOILING ORGANIC SOLVENT INTO AN AQUEOUS COAGULATING BATH, THE IMPROVEMENT WHICH COMPRISES EMPLOYING AS THE COAGULATING BATH AN AZEOTROPIC MIXTURE OF WATER AND AN ALIPHATIC ALCOHOL, WHICH AZEOTROPIC MIXTURE HAS A BOILING POINT BELOW THAT OF THE SAID SOLVENT AND OF ANY AZEOTROPIC MIXTURE FORMED BY THE SAID SOLVENT WITH A COMPONENT OF THE COAGULATING BATH, FRACTINALLY DISTILLING THE COAGULATING BATH AFTER USE TO SEPARATE THE WATER-ALCOHOL AZEOTROPE FROM HIGH BOILING SOLVENT CONTAINED IN IT, AND RE-USING THE RECOVERED AZEOTROPE AS A COAGULATING BATH AND THE RECOVERED HIGH BOILING SOLVENT AS SPINNING SOLVENT IN THE PRODUCTION OF VINYL CHLORIDE POLYMER FILAMENTS.
Claim 3
Dependent Claim
39 words
A PROCESS ACCORDING TO CLAIM 1, WHEREIN A SOLUTION OF THE POLYMER IN A SOLVENT SELECTED FROM CYCLOPENTANONE OR CYCLOHEXANONE IS EXTRUDED INTO AN AZEOTROPIC MIXTURE OF WATER AND AN ALIPHATIC ALCOHOL CONTAINING 3-4 CABON 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) | 1970-08-21 | 1971-02-20 | 1971-08-22 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1974-08-21 | 1975-02-20 | 1975-08-22 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1978-08-21 | 1979-02-20 | 1979-08-22 | $7700.00 | Window Closed / Lapsed |