US3969241A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method of and apparatus for separating chemical solutions in membrane processes
Assignee: Slovenska Vysoka Skota Technicka
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Filing: 1974-07-29
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Granted: 1976-07-13
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Expires: 1994-07-29
Abstract
Abstract Method of carrying out filtration using semi-permeable membranes in apparatus of the type having a plurality of frustoconical sections defining an annular type space between the various sections, each section having a membrane thereon, the steps comprising passing a solution to be treated along the spaces between the various sections in converging and/or diverging flow paths.
Inventors
- 👤 Michal Skrabak
- 👤 Ernest Vavrik
- 👤 Stanislav Kolarik
- 👤 Milos Mazak
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 08:31
CPC Classifications
B; B01; B01D; B01D63/00; B01D63/06; B01D63/062; B01D61/00; B01D61/02; B01D61/08; B01D61/42; B01D61/44; B01D61/46; B01D2313/00; B01D2313/14; B01D2313/146
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
55 words
A method of separating chemical solutions in membrane processes of the type including reverse osmosis, ultrafiltration and electrodialysis, comprising flowing the solution serially through a plurality of nested frustoconical membrane-lined ducts whereby the solution flows alternately outwardly and inwardly through adjacent ducts, and separating components from said solution through the membrane lining of each duct.
Claim 2
Independent Claim
55 words
A method of separating chemical solutions in membrane processes of the type including reverse osmosis, ultrafiltration and electrodialysis, comprising flowing the solution serially through a plurality of nested frustoconical membrane-lined ducts whereby the solution flows alternately outwardly and inwardly through adjacent ducts, and separating components from said solution through the membrane lining of each duct.
Claim 3
Dependent Claim
42 words
The method of claim 1, in which said membrane-covered ducts are formed of frustoconical membrane carriers, having membranes on their frustoconical surfaces, wherein said step of flowing comprises flowing said solution in contact with the membranes on each side of said carrier
Claim 4
Dependent Claim
20 words
The method of claim 2, wherein said step of separating comprises withdrawing components from the outer edge of said carrier.
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) | 1979-07-13 | 1980-01-12 | 1980-07-13 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1983-07-13 | 1984-01-12 | 1984-07-13 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1987-07-13 | 1988-01-12 | 1988-07-13 | $7700.00 | Window Closed / Lapsed |