US3963621A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Membrane diffusion device having ribbed membrane support
Assignee: Baxter International Inc
•
Filing: 1974-10-21
•
Granted: 1976-06-15
•
Expires: 1994-10-21
Abstract
Abstract A membrane diffusion device is disclosed which comprises flat, tubular, semipermeable membrane, and flexible, ribbed membrane support sheet positioned against said membrane and typically rolled up together into a coil. In accordance with this invention, a first set of membrane supporting ribs is disposed on one side of the support sheet with the ribs of the first set being disposed in longitudinal relation to the axis of the tubular membrane, the ribs of the first set also defining spaced apertures to permit fluid flow transversely across the membrane. A second set of membrane supporting ribs is disposed on the other side of the membrane support sheet at an angle to the tubular membrane axis.
Inventors
- 👤 Ferris E. Newman
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 21:22
CPC Classifications
B; B01; B01D; B01D63/00; B01D63/10; B01D63/101; B01D61/00; B01D61/24; B01D61/28; B01D2313/00; B01D2313/14; B01D2313/146
Claims Analysis
Total Claims: 12
Claim 1
Independent Claim
160 words
In a membrane diffusion device which comprises a flat, tubular, semi-permeable membrane and a flexible, ribbed, membrane support sheet positioned against said tubular membrane, said tubular membrane and support sheet being coiled together into a spiral with coils of membrane being positioned between coils of said support sheet, the improvement comprising: a first set of membrane-supporting rib sections arrayed in a series of lines on one side of said support sheet, said linear array of rib sections of the first set being disposed in longitudinal relation to the axis of said tubular membrane, said rib sections of the first set being spaced from each other to define a plurality of spaces between the rib sections to permit fluid flow transversely across said membrane between said rib sections in linear array; and a second set of membrane-supporting ribs on the other side of said membrane support sheet, said ribs of the second set defining an angle with said tubular membrane axis.
Claim 2
Dependent Claim
160 words
In a membrane diffusion device which comprises a flat, tubular, semi-permeable membrane and a flexible, ribbed, membrane support sheet positioned against said tubular membrane, said tubular membrane and support sheet being coiled together into a spiral with coils of membrane being positioned between coils of said support sheet, the improvement comprising: a first set of membrane-supporting rib sections arrayed in a series of lines on one side of said support sheet, said linear array of rib sections of the first set being disposed in longitudinal relation to the axis of said tubular membrane, said rib sections of the first set being spaced from each other to define a plurality of spaces between the rib sections to permit fluid flow transversely across said membrane between said rib sections in linear array; and a second set of membrane-supporting ribs on the other side of said membrane support sheet, said ribs of the second set defining an angle with said tubular membrane axis.
Claim 3
Dependent Claim
49 words
The diffusion device of claim 1 in which the spacing between the linear arrays of the rib sections of the first set is greater than the spacing between the ribs of the second set, to facilitate fluid flow through said membrane tubing while retaining a low fluid volume therein.
Claim 4
Dependent Claim
30 words
The diffusion device of claim 2 in which a large plurality of rib sections of equal length, and spaced from each other, are defined by each line of rib sections.
Claim 5
Dependent Claim
33 words
The diffusion device of claim 3 in which said rib sections in linear relation to each other are spaced from each other by distance which approximates the length of each said rib section.
Claim 6
Dependent Claim
22 words
The diffusion device of claim 4 in which said membrane support sheet is free of holes communicating between the opposite sides thereof.
Claim 7
Dependent Claim
24 words
The diffusion device of claim 5 in which the rib sections of adjacent lines of rib sections are longitudinally displaced relative to each other.
Claim 8
Dependent Claim
97 words
In an elongated, ribbed, flexible, sheetlike membrane support strip for use in a membrane diffusion device, the improvement comprising: a first set of membrane supporting rib sections arranged in a plurality of parallel lines on one side of said strip, the lines of rib sections of the first set being disposed in longitudinal relation to the axis of said strip, said rib sections being spaced from each other, and a second set of membrane-supporting ribs on the other side of said strip, said ribs of said second set defining an angle with the axis of said strip.
Claim 9
Dependent Claim
97 words
In an elongated, ribbed, flexible, sheetlike membrane support strip for use in a membrane diffusion device, the improvement comprising: a first set of membrane supporting rib sections arranged in a plurality of parallel lines on one side of said strip, the lines of rib sections of the first set being disposed in longitudinal relation to the axis of said strip, said rib sections being spaced from each other, and a second set of membrane-supporting ribs on the other side of said strip, said ribs of said second set defining an angle with the axis of said strip.
Claim 10
Dependent Claim
55 words
The elongated strip of claim 7 in which the spacing between the lines of rib sections is greater than the spacing between the ribs of the second set, and in which the rib sections in a line are so spaced as to define in each line a large plurality of rib sections of equal length.
Claim 11
Dependent Claim
30 words
The elongated strip of claim 8 in which said rib sections in a line are spaced from each other by a distance which approximates the length of each rib section.
Claim 12
Dependent Claim
25 words
The elongated strip of claim 9 in which the rib sections of adjacent lines of the first set are longitudinally spaced relative to each other.
References Cited (Backward Citations)
US3687293A
Cited
US3743098A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1979-06-15 | 1979-12-15 | 1980-06-15 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1983-06-15 | 1983-12-15 | 1984-06-15 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1987-06-15 | 1987-12-15 | 1988-06-15 | $7700.00 | Window Closed / Lapsed |