US3834546A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Semi-permeable tubular assembly
Assignee: Rhone Poulenc SA
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Filing: 1973-05-04
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Granted: 1974-09-10
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Expires: 1993-05-04
Abstract
Abstract A flexible semi-permeable membrane, for fluid separation apparatus, for reverse osmosis, ultra-filtration or gas separation, including a cord comprising a plurality of longitudinally extending yarns forming a core and a knitted woven or braided textile sheath surrounding the core. A semi-permeable membrane surrounds the cord, the core of which communicates with the exterior near at least one of its ends. In the manufacture of the assembly the cord is passed through a heated cylindro-conical tube to calibrate and smooth the sheath and is impregnated with water. The cord is then coated with a collodion the solvent of which is evaporated to form the semi-permeable membrane and the water is at least partly removed.
Inventors
- 👤 R Brun
- 👤 M Pages
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 01:50
CPC Classifications
B; B01; B01D; B01D69/00; B01D69/10; B01D69/107; B01D69/1071
Claims Analysis
Total Claims: 10
Claim 1
Independent Claim
58 words
In or for a fluid separation apparatus, for reverse osmosis, ultrafiltration or gas separation, a flexible semi-permeable tubular assembly including a cord comprising a plurality of longitudinally extending yarns forming a core and a textile sheath surrounding said core, a semi-permeable membrane surrounding said cord, and means providing communication between the core of said cord and the exterior.
Claim 2
Dependent Claim
58 words
In or for a fluid separation apparatus, for reverse osmosis, ultrafiltration or gas separation, a flexible semi-permeable tubular assembly including a cord comprising a plurality of longitudinally extending yarns forming a core and a textile sheath surrounding said core, a semi-permeable membrane surrounding said cord, and means providing communication between the core of said cord and the exterior.
Claim 3
Dependent Claim
25 words
A flexible semi-permeable tubular assembly as claimed in claim 1, wherein said means providing comMunication are located near at least one end of the cord.
Claim 4
Dependent Claim
38 words
A flexible semi-permeable tubular assembly as claimed in claim 1, wherein the yarns of which the core of said cord is composed are combined so as to be one of the group consisting of twisted, stranded and braided.
Claim 5
Dependent Claim
33 words
A flexible semi-permeable tubular assembly as claimed in claim 1, wherein the yarns of which the core of the cord are made have a circular cross-section of diameter between 0.1 and 3 mm.
Claim 6
Dependent Claim
25 words
A flexible semi-permeable tubular assembly as claimed in claim 1, wherein the core and the sheath of the cord are made of synthetic textile materials.
Claim 7
Dependent Claim
29 words
A flexible semi-permeable tubular assembly as claimed in claim 1, wherein the textile sheath is a sleeve formed by one of the group consisting of knitting, weaving or braiding.
Claim 8
Dependent Claim
27 words
A flexible semi-permeable tubular assembly as claimed in claim 1, wherein the textile sheath has a circular cross-section of external diameter of between 1 and 8 mm.
Claim 9
Independent Claim
120 words
A method of making a flexible semi-permeable tubular assembly, for fluid separation apparatus, for reverse osmosis, ultrafiltration of gas separation, said method comprising the steps of forming a core of at least two yarns, applying a textile sheath around said core to form a cord, passing said cord through a cylindro-conical tube heated to a sufficient temperature to cause the surface of the sheath to soften, thereby to calibrate and smooth the cord, impregnating said sheath with a compound, coating the cord with a collodion, said compound being immiscible with said collodion, and not affecting said textile sheath, evaporating the solvent from the collodion, to form a semi-permeable tubular membrane surrounding the sheath and at least partially removing the compound.
Claim 10
Independent Claim
120 words
A method of making a flexible semi-permeable tubular assembly, for fluid separation apparatus, for reverse osmosis, ultrafiltration of gas separation, said method comprising the steps of forming a core of at least two yarns, applying a textile sheath around said core to form a cord, passing said cord through a cylindro-conical tube heated to a sufficient temperature to cause the surface of the sheath to soften, thereby to calibrate and smooth the cord, impregnating said sheath with a compound, coating the cord with a collodion, said compound being immiscible with said collodion, and not affecting said textile sheath, evaporating the solvent from the collodion, to form a semi-permeable tubular membrane surrounding the sheath and at least partially removing the compound.
References Cited (Backward Citations)
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US3442389A
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US3494465A
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US3712473A
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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) | 1977-09-09 | 1978-03-11 | 1978-09-10 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-09-09 | 1982-03-11 | 1982-09-10 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-09-09 | 1986-03-11 | 1986-09-10 | $7700.00 | Window Closed / Lapsed |