US3872015A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Apparatus for separating fluids into two fractions by means of semipermeable membranes
Assignee: Danske Sukkerfabrikker AS
•
Filing: 1973-02-02
•
Granted: 1975-03-18
•
Expires: 1993-02-02
Abstract
Abstract An apparatus for separating liquids into two fractions by reverse osmosis or ultrafiltration comprising a stack of alternating membranes and membrane supports, said stack having two spaced longitudinally extending holes with a bolt inserted in each hole so as to form annular flow passages extending along the surfaces of said bolts, closing discs being provided at suitable levels on each bolt so as to stop the flow of liquid in the longitudinal direction of the stack and to direct the flow parallel to the membrane surfaces towards the opposite flow passage thus obtaining a combined parallel and series flow pattern.
Inventors
- 👤 Rud Erik Madsen
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 15:59
CPC Classifications
B; B44; B44F; B44F7/00; B01; B01D; B01D63/00; B01D63/08; B01D63/082; B01D63/084; B44F3/00
Claims Analysis
Total Claims: 5
Claim 1
Independent Claim
183 words
Apparatus for separating liquids into two fractions by means of semipermeable membranes, comprising: a stack of membrane supports, each membrane support supporting at least one semipermeable membrane so as to form a flow passage extending parallel to the membrane surface; liquid inlet and liquid outlet means communicating with said flow passages; means for collecting and discharging liquid passing through said membranes; and means for compressing the stack of membrane supports and membranes, said means for compressing including two spaced bolts connected to end flanges at the end of the stack, each bolt being inserted in aligned holes in said membrane supports and membranes to form around said bolt an annular flow passage extending longitudinally through said stack and communicating with a plurality of adjacent flow passages extending parallel to the membrane surfaces over which adjacent passages the liquid flows in the same direction, and a plurality of closing means provided at spaced locations in said longitudinal annular flow passages so as to deflect a liquid flow through such a longitudinal annular flow passage into the flow passages extending parallel to the membrane surfaces.
Claim 2
Dependent Claim
183 words
Apparatus for separating liquids into two fractions by means of semipermeable membranes, comprising: a stack of membrane supports, each membrane support supporting at least one semipermeable membrane so as to form a flow passage extending parallel to the membrane surface; liquid inlet and liquid outlet means communicating with said flow passages; means for collecting and discharging liquid passing through said membranes; and means for compressing the stack of membrane supports and membranes, said means for compressing including two spaced bolts connected to end flanges at the end of the stack, each bolt being inserted in aligned holes in said membrane supports and membranes to form around said bolt an annular flow passage extending longitudinally through said stack and communicating with a plurality of adjacent flow passages extending parallel to the membrane surfaces over which adjacent passages the liquid flows in the same direction, and a plurality of closing means provided at spaced locations in said longitudinal annular flow passages so as to deflect a liquid flow through such a longitudinal annular flow passage into the flow passages extending parallel to the membrane surfaces.
Claim 3
Dependent Claim
25 words
An apparatus as in claim 1, characterized in that the membrane supports are ellipsoidal plates provided with holes located at opposite ends of said plates.
Claim 4
Dependent Claim
27 words
An apparatus as in claim 2, characterized in that the closing means are annular rings having an inner diameter closely fitting to the surface of said bolts.
Claim 5
Dependent Claim
30 words
An apparatus as in claim 1, characterized in that the sealing means are provided with means for maintaining the edges of the membranes in intimate contact with the membrane supports.
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) | 1978-03-17 | 1978-09-16 | 1979-03-18 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-03-17 | 1982-09-16 | 1983-03-18 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-03-17 | 1986-09-16 | 1987-03-18 | $7700.00 | Window Closed / Lapsed |