US2563644A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Dialytic membrane and method of producing same
Assignee: Comptoir des Textiles Artificiels SA
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Filing: 1949-06-29
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Granted: 1951-08-07
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Expires: 1969-06-29
Abstract
No abstract record available.
Inventors
- 👤 Drisch Nicolas
- 👤 Herrbach Paul
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 10:30
CPC Classifications
B; B01; B01D; B01D71/00; B01D71/06; B01D71/38; B01D71/383; Y; Y10; Y10S; Y10S424/00; Y10S424/07
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
78 words
THE METHOD OF PRODUCING DIALYTIC MEMBRANES WHICH COMPRISES GELLING AT LOW TEMPERATURE A THIN LAYER OF A POLYVINYL ACETAL FROM A SOLUTION THEREOF IN A HIGH BOILING SOLVENT IN WHICH THE POLYVINYL ACETAL IS SOLUBLE ONLY AT ELEVATED TEMPERATURES AND CONSISTING ESSENTIALLY OF A MIXTURE OF GLYCOL MONOCHLORHYDRIN AND A WATER SOLUBLE ETHER OF A POLYETHYLENE GLYCOL CONTAINING AT LEAST 80% OF SAID ETHER, WASHING SAID MEMBRANE WITH WATER AND PRESERVING IN THE WET STATE UNTIL ULTIMATE USE.
Claim 2
Independent Claim
78 words
THE METHOD OF PRODUCING DIALYTIC MEMBRANES WHICH COMPRISES GELLING AT LOW TEMPERATURE A THIN LAYER OF A POLYVINYL ACETAL FROM A SOLUTION THEREOF IN A HIGH BOILING SOLVENT IN WHICH THE POLYVINYL ACETAL IS SOLUBLE ONLY AT ELEVATED TEMPERATURES AND CONSISTING ESSENTIALLY OF A MIXTURE OF GLYCOL MONOCHLORHYDRIN AND A WATER SOLUBLE ETHER OF A POLYETHYLENE GLYCOL CONTAINING AT LEAST 80% OF SAID ETHER, WASHING SAID MEMBRANE WITH WATER AND PRESERVING IN THE WET STATE UNTIL ULTIMATE USE.
References Cited (Backward Citations)
US2077298A
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US2056796A
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US2046378A
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US2148062A
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US2338787A
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FR843823A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1954-08-06 | 1955-02-05 | 1955-08-07 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1958-08-06 | 1959-02-05 | 1959-08-07 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1962-08-06 | 1963-02-05 | 1963-08-07 | $7700.00 | Window Closed / Lapsed |