US3603719A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Flexible tubes having inner sheath serving as mandrel for outer sheath and method of making same
Assignee: Compagnie Generale des Etablissements Michelin SCA
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Filing: 1969-10-13
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Granted: 1971-09-07
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Expires: 1989-10-13
Abstract
Abstract A flexible tube is formed with an outer sheath comprising reinforcing steel cords helically wound and distributed in an even number of layers and an inner sheath comprising a reinforcing braid of steel wires, the wires being in spaced-apart relation to each other. The inner sheath resists crushing and twisting and serves as a mandrel for the manufacture of the outer sheath.
Inventors
- 👤 Daniel Lejeune
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 00:12
CPC Classifications
B; B29; B29D; B29D23/00; B29D23/001; F; F16; F16L; F16L11/00; F16L11/04; F16L11/08; F16L11/12; F16L11/127; F16L11/22; B29K; B29K2021/00; B29K2105/00; B29K2105/06; B29L; B29L2023/00; B29L2023/005
Claims Analysis
Total Claims: 13
Claim 1
Independent Claim
84 words
A flexible tube comprising an outer sheath and an inner sheath, said outer and inner sheaths being coaxial and integrally joined to each other, said outer sheath comprising reinforcing steel cords helically wound and distributed in an even number of layers, said inner sheath comprising a reinforcing braid of steel wires, said wires being in spaced-apart relation to each other, and said inner sheath having an inner surface defining a main conduit and being resistant to crushing and to twisting but adapted for coiling.
Claim 2
Dependent Claim
84 words
A flexible tube comprising an outer sheath and an inner sheath, said outer and inner sheaths being coaxial and integrally joined to each other, said outer sheath comprising reinforcing steel cords helically wound and distributed in an even number of layers, said inner sheath comprising a reinforcing braid of steel wires, said wires being in spaced-apart relation to each other, and said inner sheath having an inner surface defining a main conduit and being resistant to crushing and to twisting but adapted for coiling.
Claim 3
Dependent Claim
22 words
A flexible tube in accordance with claim 1 wherein said inner sheath comprises a layer of strandular material arranged in contiguous helices.
Claim 4
Dependent Claim
18 words
A flexible tube in accordance with claim 2 wherein said strandular material is in the form of cables.
Claim 5
Dependent Claim
18 words
A flexible tube in accordance with claim 2 wherein said strandular material is in the form of wires.
Claim 6
Dependent Claim
18 words
A flexible tube in accordance with claim 2 wherein said strandular material is in the form of tubes.
Claim 7
Dependent Claim
14 words
A flexible tube in accordance with claim 2 wherein said strandular material is metallic.
Claim 8
Dependent Claim
26 words
A flexible tube in accordance with claim 1 wherein said inner sheath comprises electrical conductors for transmitting an electrical current along the length of said tube.
Claim 9
Dependent Claim
32 words
A flexible tube in accordance with claim 1 wherein said inner sheath comprises at least one conduit in addition to said main conduit for transporting fluid along the length of said tube.
Claim 10
Independent Claim
80 words
A method of manufacturing a flexible tube, comprising the steps of forming an inner sheath, simultaneously reinforcing said inner sheath by forming therein a braid of steel wires, said wires being in spaced-apart relation to each other, so that said inner sheath resists crushing and twisting but remains adapted for coiling, forming an elastomeric outer sheath, said inner sheath serving as a mandrel during forming of said outer sheath, and integrally joining said outer and inner sheaths to each other.
Claim 11
Independent Claim
80 words
A method of manufacturing a flexible tube, comprising the steps of forming an inner sheath, simultaneously reinforcing said inner sheath by forming therein a braid of steel wires, said wires being in spaced-apart relation to each other, so that said inner sheath resists crushing and twisting but remains adapted for coiling, forming an elastomeric outer sheath, said inner sheath serving as a mandrel during forming of said outer sheath, and integrally joining said outer and inner sheaths to each other.
Claim 12
Dependent Claim
39 words
A method according to claim 9 comprising the step of reinforcing said outer sheath with an even number of layers of helically wound steel cords so that said outer sheath resists crushing and twisting but remains adapted for coiling.
Claim 13
Dependent Claim
19 words
A method according to claim 9 wherein said tube is manufactured in continuous lengths of at least 500 meters.
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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) | 1974-09-06 | 1975-03-08 | 1975-09-07 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-09-06 | 1979-03-08 | 1979-09-07 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-09-06 | 1983-03-08 | 1983-09-07 | $7700.00 | Window Closed / Lapsed |