US2985637A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Process for the extraction of carboxylic acid from aqueous saponification mixtures of carboxylic acid esters of polyvinyl alcohol
Assignee: Consortium fuer Elektrochemische Industrie GmbH
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Filing: 1957-01-22
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Granted: 1961-05-23
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Expires: 1977-01-22
Abstract
No abstract record available.
Inventors
- 👤 Anselm Hans
- 👤 Winkler Heinz
- 👤 Smidt Jurgen
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 08:26
CPC Classifications
C; C08; C08F; C08F8/00; C08F8/12; Y; Y10; Y10T; Y10T70/00; Y10T70/40; Y10T70/413; Y10T70/437; Y10T70/446; Y10T70/465; Y10T70/474; Y10T70/476
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
104 words
PROCESS FOR THE LIQUID-LIQUID EXTRACTION OF CARBOXYLIC ACID FROM AN AQUEOUS SAPONIFICATION SOLUTION OF CARBOXYLIC ACID ESTERS OF POLYVINYL ALCOHOL, WHICH COMPRISES PASSING SAID SOLUTION IN COUNTER-CURRENT FLOW TO A NONAQUEOUS EXTRACTION LIQUID WHICH IS A SOLVENT FOR SAID ACID AND IS IMMISCIBLE WITH SAID SOLUTION AND WHICH IS MORE VOLATILE THAN THE LEAST VOLATILE COMPONENT OF SAID SOLUTION THROUGH MULTI-APERTURED MEDIA IN AN EXTRACTION ZONE, AND EXERTING RELATIVE VIBRATORY MOVEMENT BETWEEN SAID SOLUTION AND SAID LIQUID TO CREATE HIGH TUBULENCE IN SAID ZONE, SAID LIQUID TO CREATE HIGH TURBULENCE IN SAID ING OF ISOPROPYL ETHER, 2-BUTANONE, 2-PENTANONE, METHYL ISOBUTYL-KETONE, ISOPHORONE, AND TRIBUTYL PHOSPHATE.
Claim 2
Dependent Claim
104 words
PROCESS FOR THE LIQUID-LIQUID EXTRACTION OF CARBOXYLIC ACID FROM AN AQUEOUS SAPONIFICATION SOLUTION OF CARBOXYLIC ACID ESTERS OF POLYVINYL ALCOHOL, WHICH COMPRISES PASSING SAID SOLUTION IN COUNTER-CURRENT FLOW TO A NONAQUEOUS EXTRACTION LIQUID WHICH IS A SOLVENT FOR SAID ACID AND IS IMMISCIBLE WITH SAID SOLUTION AND WHICH IS MORE VOLATILE THAN THE LEAST VOLATILE COMPONENT OF SAID SOLUTION THROUGH MULTI-APERTURED MEDIA IN AN EXTRACTION ZONE, AND EXERTING RELATIVE VIBRATORY MOVEMENT BETWEEN SAID SOLUTION AND SAID LIQUID TO CREATE HIGH TUBULENCE IN SAID ZONE, SAID LIQUID TO CREATE HIGH TURBULENCE IN SAID ING OF ISOPROPYL ETHER, 2-BUTANONE, 2-PENTANONE, METHYL ISOBUTYL-KETONE, ISOPHORONE, AND TRIBUTYL PHOSPHATE.
References Cited (Backward Citations)
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Cited
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US2583991A
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US2642420A
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US2667407A
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US2668810A
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US2662001A
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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) | 1964-05-22 | 1964-11-21 | 1965-05-23 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1968-05-22 | 1968-11-21 | 1969-05-23 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1972-05-22 | 1972-11-21 | 1973-05-23 | $7700.00 | Window Closed / Lapsed |