US3948781A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Selectively permeable membrane on hollow cord
Assignee: Rhone Poulenc Textile SA
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Filing: 1974-05-10
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Granted: 1976-04-06
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Expires: 1994-05-10
Abstract
Abstract A selectively-permeable tubular element is provided which comprises an essentially tubular sheath of uniform textile material, the whole of which has been heated to a uniform temperature such that the sheath can subsequently be bent in an arc of radius of curvature not exceeding about 10 cm while retaining substantially circular cross-section, with a selectively permeable membrane applied to the sheath.
Inventors
- 👤 Robert Brun
- 👤 Michel Pages
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 22:25
CPC Classifications
B; B01; B01D; B01D69/00; B01D69/10; B01D69/105; B01D69/107; B01D69/1071
Claims Analysis
Total Claims: 17
Claim 1
Independent Claim
66 words
A selectively-permeable tubular element which comprises an essentially tubular sheath of uniform textile material having an external diameter up to about 10mm, the whole of which has been heated to a uniform temperature such that the sheath can subsequently be bent in an arc of radius of curvature not exceeding about 10cm while retaining substantially circular cross-section, with a selectively permeable membrane applied to the sheath.
Claim 2
Dependent Claim
66 words
A selectively-permeable tubular element which comprises an essentially tubular sheath of uniform textile material having an external diameter up to about 10mm, the whole of which has been heated to a uniform temperature such that the sheath can subsequently be bent in an arc of radius of curvature not exceeding about 10cm while retaining substantially circular cross-section, with a selectively permeable membrane applied to the sheath.
Claim 3
Dependent Claim
20 words
An element according to claim 1, in which the external surface of the textile sheath has a substantially constant diameter.
Claim 4
Dependent Claim
20 words
An element according to claim 1 in which the textile sheath consists of yarns and/or fibres made of synthetic material.
Claim 5
Dependent Claim
22 words
An element according to claim 3, in which the synthetic material softens over a temperature range of at least about 5° C.
Claim 6
Dependent Claim
14 words
An element according to claim 4, in which the synthetic material is a polyolefine.
Claim 7
Dependent Claim
15 words
An element according to claim 1 in which the textile sheath is a braided sheath.
Claim 8
Dependent Claim
16 words
An element according to claim 1 in which the textile sheath is made from multi-strand yarns.
Claim 9
Dependent Claim
24 words
An element according to claim 1 in which the circular cross-section of the sheath has an external diameter of from 1 to 10 mm.
Claim 10
Dependent Claim
21 words
An element according to claim 1 in which the textile sheath is covered externally with a membrane based on cellulose acetate.
Claim 11
Dependent Claim
13 words
An element according to claim 1 in which the sheath has been pre-stressed.
Claim 12
Dependent Claim
73 words
Process for the preparation of a selectively-permeable tubular element as defined in claim 1 which comprises passing an essentially tubular sheath of a uniform textile material through a heating zone of the textile at a temperature which is close to the maximum temperature which the material can withstand without undergoing significant deterioration for a sufficient period of time to achieve thermal equilibrium throughout the sheath, and covering it with a selectively permeable membrane.
Claim 13
Dependent Claim
53 words
Process according to claim 11, in which after being passed through the heating zone and before being covered with the membrane, the textile sheath is drawn through at least one convergent tube so as to remove the asperities from its external surface and so as to give it a substantially constant external diameter.
Claim 14
Dependent Claim
34 words
Process according to claim 11 in which the sheath is made of yarns and/or fibres of synthetic material and the heating zone is at a temperature within the range over which the material softens.
Claim 15
Dependent Claim
34 words
Process according to claim 12 in which the sheath is made of yarns and/or fibres of synthetic material and the heating zone is at a temperature within the range over which the material softens.
Claim 16
Dependent Claim
17 words
Process according to claim 11 in which the membrane is formed in situ around the textile sheath.
Claim 17
Dependent Claim
19 words
Process according to claim 11 in which the membrane is prepared beforehand and is applied around the textile sheath.
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) | 1979-04-06 | 1979-10-06 | 1980-04-06 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1983-04-06 | 1983-10-06 | 1984-04-06 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1987-04-06 | 1987-10-06 | 1988-04-06 | $7700.00 | Window Closed / Lapsed |