Patent US3682318A successfully refreshed from Google Patents.
US3682318A
Expired / Lapsed
US
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Tubular ultrafiltration membrane and support
Assignee: Amicon Corp
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Filing: 1970-06-10
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Granted: 1972-08-08
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Expires: 1990-06-10
Abstract
Abstract An ultrafiltration device comprising an anisotropic ultrafiltration membrane tube secured around a liquid-impermeable cylindrical core. The core has a plurality of peripherally spaced, axial ribs along its outer surface, which define therebetween a plurality of axial grooves. The anisotropic membrane comprises a polymer film comprising a porous support layer and a less porous barrier layer integral therewith at one face of the support layer, and the barrier layer of the membrane tube is in contact with the ribs, so that the membrane defines, with the grooves, a plurality of axially extending channels adjacent this barrier layer and having a fluid inlet at one end and a fluid outlet at the other.
Inventors
- 👤 Peter N Rigopulos
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 10:30
CPC Classifications
B; B01; B01D; B01D65/00; B01D65/08; B01D63/00; B01D63/06; B01D63/062; B01D63/063; B01D2321/00; B01D2321/10
Claims Analysis
Total Claims: 11
Claim 1
Independent Claim
137 words
An ultrafiltration device comprising a liquid-impermeable cylindrical core having a plurality of peripherally spaced axial ribs located on the outer surface of said core and defining therebetween a plurality of axial grooves, and an anisotropic ultrafiltration membrane tube secured around said core in contact with said ribs, defining with said grooves a plurality of axially extending channels having a fluid inlet at one end and a fluid outlet at the opposite end, said anisotropic ultrafiltration membrane comprising a polymer film comprising a porous support layer and a less porous barrier layer integral therewith, said barrier layer being in contact with said rib, and a perforate reinforcing member encompassing the outer surface of said membrane tube under tension to secure said membrane tube on said core and to reinforce and confine it against fluid pressure within said tube.
Claim 2
Dependent Claim
137 words
An ultrafiltration device comprising a liquid-impermeable cylindrical core having a plurality of peripherally spaced axial ribs located on the outer surface of said core and defining therebetween a plurality of axial grooves, and an anisotropic ultrafiltration membrane tube secured around said core in contact with said ribs, defining with said grooves a plurality of axially extending channels having a fluid inlet at one end and a fluid outlet at the opposite end, said anisotropic ultrafiltration membrane comprising a polymer film comprising a porous support layer and a less porous barrier layer integral therewith, said barrier layer being in contact with said rib, and a perforate reinforcing member encompassing the outer surface of said membrane tube under tension to secure said membrane tube on said core and to reinforce and confine it against fluid pressure within said tube.
Claim 3
Dependent Claim
37 words
The device of claim 1 wherein said membrane tube is formed of a flat sheet of membraneous material wrapped about said core, with its margins joined along an axially extending sealing zone to form a continuous tube.
Claim 4
Dependent Claim
16 words
The device of claim 2 wherein said membrane margins are heat sealed along said sealing zone.
Claim 5
Dependent Claim
23 words
The device of claim 2 wherein said membrane margins overlap in said sealing zone, and an adhesive is disposed between said overlapping margins.
Claim 6
Dependent Claim
23 words
The device of claim 2 wherein a layer of pressure-sensitive, porous adhesive tape is adhered to said membrane margins along said sealing zone.
Claim 7
Dependent Claim
25 words
The device of claim 1 wherein said membrane tube includes a second porous support layer secured to the said support layer of said polymer film.
Claim 8
Dependent Claim
15 words
The device of claim 6 wherein said second support layer is a weftless polyethylene sheet.
Claim 9
Dependent Claim
13 words
The device of claim 1 wherein said reinforcing layer is a braided tube.
Claim 10
Dependent Claim
70 words
The device of claim 1 including at least one end sealing member for sealing an axial end of said membrane, said member arranged to be secured to the respective end of said core, and having a passage constructed to provide a fluid flow path through said sealing member to a portion of said membrane a distance from the said sealed axial end of said membrane and adjacent said axial channels.
Claim 11
Dependent Claim
49 words
The device of claim 9 wherein the inner end of said sealing member is at least partially spaced from the adjacent outer end of said core to define a fluid chamber therebetween communicating with said passage through said sealing member and with the respective end of said axial channels.
References Cited (Backward Citations)
FR664429A
Cited
US3421782A
Cited
US3480147A
Cited
US3542204A
Cited
US3488768A
Cited
US3547272A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1975-08-08 | 1976-02-07 | 1976-08-08 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-08-08 | 1980-02-07 | 1980-08-08 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-08-08 | 1984-02-07 | 1984-08-08 | $7700.00 | Window Closed / Lapsed |