# US 6,294,234 B1 · Fluid conduit for fuels and fuel vapors > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 6,294,234 B1 - Document ID: US6294234B1 - Status: Granted - Kind: B1 - Application number: 09/238,226 - Filed: 1999-01-27 - Granted: 2001-09-25 - Earliest claimed: 1998-07-16 - Assignees: Rasmussen GmbH - Inventors: Janos Kertesz - Web page: https://patentgrep.com/patent/US6294234B1 ## CPC - B32B 27/08: of synthetic resin - B32B 7/022: Mechanical properties - B32B 27/36: comprising polyesters - C08L 67/025: {containing polyether sequences} - F02M 55/02: Conduits between injection pumps and injectors {, e.g. conduits between pump and common-rail or conduits between common-rail and injectors} - F16L 9/12: of plastics with or without reinforcement (F16L9/16 - F16L9/22 take precedence) - F16L 11/045: {with four or more layers without reinforcement} - F16L 11/08: with reinforcements embedded in the wall (F16L11/11 takes precedence) - F16L 11/127: electrically conducting - B32B 2255/10: on synthetic resin layer or on natural or synthetic rubber layer - B32B 2307/3065: Flame resistant or retardant, fire resistant or retardant - B32B 2307/54: Yield strength; Tensile strength - B32B 2307/546: Flexural strength; Flexion stiffness - B32B 2307/558: Impact strength, toughness - B32B 2597/00: Tubular articles, e.g. hoses, pipes - B60K 15/01: Arrangement of fuel conduits - F16L 2011/047: {with a diffusion barrier layer} - Y10T 428/1321: Polymer or resin containing [i.e., natural or synthetic] - Y10T 428/1372: Randomly noninterengaged or randomly contacting fibers, filaments, particles, or flakes - Y10T 428/1393: Multilayer [continuous layer] - B32B: LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM - C08L: COMPOSITIONS OF MACROMOLECULAR COMPOUNDS (compositions based on polymerisable monomers C08F, C08G; artificial filaments or fibres D01F; textile treating compositions D06) - F02M: SUPPLYING COMBUSTION ENGINES IN GENERAL WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF - F16L: PIPES; JOINTS OR FITTINGS FOR PIPES; SUPPORTS FOR PIPES, CABLES OR PROTECTIVE TUBING; MEANS FOR THERMAL INSULATION IN GENERAL - B60K: ARRANGEMENT OR MOUNTING OF PROPULSION UNITS OR OF TRANSMISSIONS IN VEHICLES; ARRANGEMENT OR MOUNTING OF PLURAL DIVERSE PRIME-MOVERS IN VEHICLES; AUXILIARY DRIVES FOR VEHICLES; INSTRUMENTATION OR DASHBOARDS FOR VEHICLES; ARRANGEMENTS IN CONNECTION WITH COOLING, AIR INTAKE, GAS EXHAUST OR FUEL SUPPLY OF PROPULSION UNITS IN VEHICLES - Y10T: TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION ## Abstract A fuel or fuel vapor fluid conduit includes a first thermoplastic material including a thermoplastic polyester elastomer. A second thermoplastic material includes a thermoplastic polyester having higher bending and flexibility than the bending and flexibility of the first thermoplastic material. The second material has a lower tensile strength and impact strength than the tensile strength and impact strength of the first material. ## Claims ### Claim 1 A fuel or fuel vapor fluid conduit comprising: a first thermoplastic material including a thermoplastic polyester elastomer; a second thermoplastic material including a thermoplastic polyester material having higher bending strength and tensile strength than the bending strength and tensile strength of the first thermoplastic material, said second material having a lower extensibility and impact strength than the extensibility and impact strength of said first material; and a first layer and a second layer, the first thermoplastic material being contained in the first layer and the second thermoplastic material being contained in the second layer. ### Claim 2 (depends on 1) The fluid conduit according to claim 1, further comprising more than two layers, the first and the second thermoplastic materials being contained in alternating layers. ### Claim 3 (depends on 1) The fluid conduit according to claim 1, wherein said first material and said second material are combined in a mixture, the mixture of the two materials being contained in an additional layer. ### Claim 4 (depends on 2) The fluid conduit according to claim 2, wherein said first material and said second material are combined in a mixture, said mixture of the two materials being contained in an additional layer. ### Claim 5 (depends on 3) The fluid conduit according to claim 3, wherein the first thermoplastic material is selected from the group consisting of a block copolymer of hard crystalline polybutyleneterephthalate blocks and soft amorphous, long-chain polyetherglycol blocks, and a thermoplastic polyester elastomer based on polybutylenenaphthalate. ### Claim 6 (depends on 4) The fluid conduit according to claim 4, wherein the second thermoplastic material is selected from the group consisting of a polybutyleneterephthalate, poly-ethyleneterephthalate, polybutylenenaphthalate and polyethylenenaphthalate. ### Claim 7 (depends on 1) The fluid conduit according to claim 1, wherein the layers have a preselected thickness ratio so that the fluid conduit has a sufficiently high clamping force to be securable on a pipe socket against unintended pulling off under predetermined conditions. ### Claim 8 (depends on 1) The fluid conduit of claim 1, wherein the overall thickness of the second layer is 10 to 70% of the overall wall thickness of the fluid conduit. ### Claim 9 (depends on 1) The fluid conduit according to claim 1, wherein one of the layers has a reinforcement therein selected from the group consisting of glass fibers, steel fibers, glass balls and minerals, and mixtures of at least two of these reinforcement materials. ### Claim 10 (depends on 1) The fluid conduit according to claim 1, wherein one of the layers is electrically conductive. ### Claim 11 (depends on 1) The fluid conduit according to claim 1, wherein one of the layers is antistatic. ### Claim 12 (depends on 1) The fluid conduit according to claim 1, further comprising a flame protection layer sheathing the fluid conduit. ### Claim 13 (depends on 12) The fluid conduit according to claim 12, wherein the flame protection layer is made of a reusable material.