US3601159A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Tubular membrane and membrane support manufacturing process
Assignee: United States Department of the Interior
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Filing: 1968-02-07
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Granted: 1971-08-24
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Expires: 1988-02-07
Abstract
Abstract Reverse osmosis tubes, and a method for forming them including the steps of: wrapping a porous paper strip about a mandrel; sealing the porous paper strip at its edges to form a porous paper tube; moving the porous paper tube along the mandrel; winding resin-impregnated glass fibers over the outer surface of the moving tube to produce a porous glass fiber coating; heating the glass fiber coating to cure the resin as it moves with the tube; cooling the glass fiber coating; coating the inner surface of the moving porous paper tube with a thin layer of reverseosmosis-membrane-forming solution; drawing a slight vacuum around the outer surface of the porous glass fiber coating in an area overlapping the axial position where the membrane-forming solution is applied, causing the membrane-forming solution to closely adhere to the inner surface of the porous paper tube; and, immersing the coated porous paper tube in a gelation bath to gel the film to a useable membrane state.
Inventors
- 👤 Murray Marks
- 👤 Harry A King
- 👤 Paul A Longwell
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 16:56
CPC Classifications
B; B29; B29C; B29C53/00; B29C53/36; B29C53/38; B29C53/48; B29C53/50; A; A22; A22C; A22C13/00; A22C13/0013; B01; B01D; B01D69/00; B01D69/10; B29C48/00; B29C48/03; B29C48/07; B29C48/08; B29C48/15; B29C48/151; B29C65/00; B29C65/48; B29C66/00; B29C66/01; B29C66/05; B29C66/10; B29C66/11; B29C66/112; B29C66/1122; B29C66/40; B29C66/41; B29C66/43; B29C66/432; B29C66/4329; B29C66/80; B29C66/83; B29C66/834; B29C66/8341; B29C66/83411; B29C66/83413; B29C66/83421; B29C65/4805; B29C65/481; B29C65/4815; B29C65/52; B29C65/524; B29C66/70; B29C66/71; B29C66/83431; B29C66/83433; B29K; B29K2001/00; B29K2001/08; B29K2001/12
Claims Analysis
Total Claims: 5
Claim 1
Independent Claim
58 words
A tubular reverse osmosis element comprising a porous, elongated, resin-bonded glass fiber tube having an adhering paper layer at its inner surface with a reverse osmosis membrane formed on and adhering to the inner face of the paper layer, said resin serving to bond the fibers of the tube together and the paper layer to the glass fibers.
Claim 2
Dependent Claim
58 words
A tubular reverse osmosis element comprising a porous, elongated, resin-bonded glass fiber tube having an adhering paper layer at its inner surface with a reverse osmosis membrane formed on and adhering to the inner face of the paper layer, said resin serving to bond the fibers of the tube together and the paper layer to the glass fibers.
Claim 3
Dependent Claim
25 words
A tubular reverse osmosis element in accordance with claim 1 wherein the glass fiber portion of the tubular element is more permeable than the paper.
Claim 4
Independent Claim
166 words
A method for continuously forming a reverse osmosis tube comprising the following steps in the order presented: wrapping a porous, fibrous strip about a mandrel, sealing the porous, fibrous strip at its edges to form a porous, fibrous tube, moving the porous, fibrous tube along the mandrel, winding resin-impregnated glass fibers over the outer surface of the moving tube to produce a porous glass fiber coating, hEating the glass fiber coating as it moves with the tube to cure the resin, cooling the glass fiber coating, coating the inner surface of the moving porous, fibrous tube with a thin layer of reverse-osmosis-membrane-forming solution, drawing a slight vacuum around the outer surface of the porous glass fiber coating in an area overlapping the axial position where the membrane-forming solution is applied, causing the membrane-forming solution to closely adhere to the inner surface of the porous, fibrous tube, and immersing the coated porous, fibrous tube in a gelatin bath to gel the film to a useable membrane state.
Claim 5
Independent Claim
166 words
A method for continuously forming a reverse osmosis tube comprising the following steps in the order presented: wrapping a porous, fibrous strip about a mandrel, sealing the porous, fibrous strip at its edges to form a porous, fibrous tube, moving the porous, fibrous tube along the mandrel, winding resin-impregnated glass fibers over the outer surface of the moving tube to produce a porous glass fiber coating, hEating the glass fiber coating as it moves with the tube to cure the resin, cooling the glass fiber coating, coating the inner surface of the moving porous, fibrous tube with a thin layer of reverse-osmosis-membrane-forming solution, drawing a slight vacuum around the outer surface of the porous glass fiber coating in an area overlapping the axial position where the membrane-forming solution is applied, causing the membrane-forming solution to closely adhere to the inner surface of the porous, fibrous tube, and immersing the coated porous, fibrous tube in a gelatin bath to gel the film to a useable membrane state.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1974-08-23 | 1975-02-22 | 1975-08-24 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-08-23 | 1979-02-22 | 1979-08-24 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-08-23 | 1983-02-22 | 1983-08-24 | $7700.00 | Window Closed / Lapsed |