Patents by Inventor Arnaud Letocart
Arnaud Letocart has filed for patents to protect the following inventions. This listing includes patent applications that are pending as well as patents that have already been granted by the United States Patent and Trademark Office (USPTO).
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Publication number: 20230356448Abstract: The extrusion installation is configured for manufacturing a complex profiled-element strip, such as a tread, based on elastomer compounds by co-extrusion, and comprises multiple extruders feeding elastomer compounds to an extrusion head. The extrusion head receives a proportion of elastomer compound of between 2 and 25% of the total volumetric throughput of the installation from at least one Archimedean-screw extruder and the rest from positive-displacement extruders.Type: ApplicationFiled: July 21, 2023Publication date: November 9, 2023Inventors: Henri HINC, Arnaud Letocart, Christophe Ougier
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Patent number: 11485047Abstract: The facility for manufacturing a profile strip made from several elastomer mixtures with different compositions by coextrusion includes at least two extruders which feed elastomer mixtures to an extrusion head. The extruders discharge directly into the extrusion head, which is interchangeable and groups together all of the dimensional tooling.Type: GrantFiled: December 22, 2017Date of Patent: November 1, 2022Assignee: Compagnie Generale Des Etablissements MichelinInventors: Christophe Ougier, Arnaud Letocart
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Patent number: 11364667Abstract: An installation for producing a profiled band based on several mixtures of elastomers of a different composition by means of coextrusion. The installation includes at least two extruders for supplying a mixture of elastomers to an extrusion head. The extrusion head comprises an assembly of at least two plates which are arranged side by side. Each plate having at least one cavity which enables the mixture from an extruder to be chaneled towards an outlet hole. The plates are arranged substantially transversely relative to the output direction of the mixture flows of the extruders in order to produce a discharge at approximately 90° of the mixture flow at the outlet of the screw of each extruder.Type: GrantFiled: December 22, 2017Date of Patent: June 21, 2022Assignee: COMPAGNIE GENERALE DES ETABLISSEMENTS MICHELINInventors: Christophe Ougier, Arnaud Letocart
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Patent number: 11279060Abstract: An extrusion apparatus intended for the manufacture of a coextruded profiled element P for tyres, produced from rubber compounds of various compositions, comprises a profiling device (30) arranged at the outlet of at least two flow channels (34, 35) for rubbery compounds of different composition. The said channels receive the compounds from positive-displacement contrarotating twin-screw extruders (10, 20), the screw flights interpenetrating and having conjugated profiles.Type: GrantFiled: December 21, 2016Date of Patent: March 22, 2022Assignee: Compagnie Generale des Etablissements MichelinInventors: Christophe Ougier, Arnaud Letocart
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Patent number: 11260648Abstract: A screw having a longitudinal body and, around this longitudinal body, at least one flight extending in the shape of a helix, the flight including, over part of its length, internal partitioning delimiting a plurality of internal channels that extend in the shape of helices following the helix shape of the flight. The screw includes manifold-like cavities into which the ends of the interior canals open, the manifold-like cavities extending radially and opened into a longitudinal bore of the body at longitudinally spaced locations. This screw can be produced by additive manufacturing using laser-induced fusion.Type: GrantFiled: December 16, 2016Date of Patent: March 1, 2022Assignee: COMPAGNIE GENERALE DES ETABLISSEMENTS MICHELINInventors: Christophe Ougier, Arnaud Letocart
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Publication number: 20210170661Abstract: The extrusion installation is configured for manufacturing a complex profiled-element strip, such as a tread, based on elastomer compounds by co-extrusion, and comprises multiple extruders feeding elastomer compounds to an extrusion head. The extrusion head receives a proportion of elastomer compound of between 2 and 25% of the total volumetric throughput of the installation from at least one Archimedean-screw extruder and the rest from positive-displacement extruders.Type: ApplicationFiled: May 13, 2019Publication date: June 10, 2021Inventors: Henri Hinc, Arnaud LETOCART, Christophe OUGIER
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Publication number: 20200282622Abstract: A screw having a longitudinal body and, around this longitudinal body, at least one flight extending in the shape of a helix, the flight including, over part of its length, internal partitioning delimiting a plurality of internal channels that extend in the shape of helices following the helix shape of the flight. The screw includes manifold-like cavities into which the ends of the interior canals open, the manifold-like cavities extending radially and opened into a longitudinal bore of the body at longitudinally spaced locations. This screw can be produced by additive manufacturing using laser-induced fusion.Type: ApplicationFiled: December 16, 2016Publication date: September 10, 2020Inventors: Christophe Ougier, Arnaud Letocart
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Publication number: 20200180203Abstract: The installation is for producing a coextruded profiled element for tires that is made from rubber compounds of different compositions. The installation includes at least one first extruder having a screw with a longitudinal axis and at least one second extruder having a screw with a different longitudinal axis. An extrusion head is connected to each of the extruders by appropriate ducts. The feed inlet of each extruder is connected to the delivery orifice of a gear pump.Type: ApplicationFiled: June 21, 2018Publication date: June 11, 2020Inventors: Christophe OUGIER, Arnaud LETOCART
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Publication number: 20190315036Abstract: An installation for producing a profiled band based on several mixtures of elastomers of a different composition by means of coextrusion. The installation includes at least two extruders for supplying a mixture of elastomers to an extrusion head. The extrusion head comprises an assembly of at least two plates which are arranged side by side. Each plate having at least one cavity which enables the mixture from an extruder to be chaneled towards an outlet hole. The plates are arranged substantially transversely relative to the output direction of the mixture flows of the extruders in order to produce a discharge at approximately 90° of the mixture flow at the outlet of the screw of each extruder.Type: ApplicationFiled: December 22, 2017Publication date: October 17, 2019Inventors: Christophe Ougier, Arnaud Letocart
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Publication number: 20190308361Abstract: The facility for manufacturing a profile strip made from several elastomer mixtures with different compositions by coextrusion includes at least two extruders which feed elastomer mixtures to an extrusion head. The extruders discharge directly into the extrusion head, which is interchangeable and groups together all of the dimensional tooling.Type: ApplicationFiled: December 22, 2017Publication date: October 10, 2019Inventors: Christophe Ougier, Arnaud Letocart
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Patent number: 10343322Abstract: The present disclosure relates to devices for extruding plastics, notably mixtures of elastomers which are intended to be used in the manufacture of tires.Type: GrantFiled: July 18, 2014Date of Patent: July 9, 2019Assignees: Compagnie Generale Des Etablissements Michelin, Michelin Recherche Et Technique, S.A.Inventors: Arnaud Letocart, Christophe Ougier, Gerard Crosnier
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Publication number: 20180370074Abstract: An extrusion apparatus intended for the manufacture of a coextruded profiled element P for tyres, produced from rubber compounds of various compositions, comprises a profiling device (30) arranged at the outlet of at least two flow channels (34, 35) for rubbery compounds of different composition. The said channels receive the compounds from positive-displacement contrarotating twin-screw extruders (10, 20), the screw flights interpenetrating and having conjugated profiles.Type: ApplicationFiled: December 21, 2016Publication date: December 27, 2018Inventors: CHRISTOPHE OUGIER, ARNAUD LETOCART
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Patent number: 10144249Abstract: The device for producing a tire component by winding, comprises: a helicoidal external wall, and means for adjusting a diameter of the wall.Type: GrantFiled: October 7, 2013Date of Patent: December 4, 2018Assignees: Compagnie Generale Des Etablissements Michelin, Michelin Recherche Et Technique, S.A.Inventors: Arnaud Letocart, Gérard Crosnier, Christophe Ougier
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Publication number: 20170129156Abstract: An Extruder for providing a flow of viscoelastic material such as rubber is disclosed herein. The extruder includes several zones (A, P, H, S), each assigned to a particular rheological function and arranged axially from an upstream end to a downstream end of the extruder and having an endless screw of given diameter (D). In each of the zones, at least one helicoidal flight extends radially from a central shaft of the screw over a height (h1), in a direction and with a pitch which are defined for each of the zones, and which is rotationally driven about an axis (XX?) in a barrel.Type: ApplicationFiled: June 30, 2015Publication date: May 11, 2017Applicants: COMPAGNIE GENERALE DES ETABLISSEMENTS MICHELIN, MICHELIN RECHERCHE ET TECHNIQUE, S.A.Inventors: Arnaud LETOCART, Bernard CAPPA, Christophe OUGIER, Philippe LAMOINE, Gérard CROSSNIER, Josian GOURDOUZE
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Publication number: 20160151953Abstract: The present disclosure relates to devices for extruding plastics, notably mixtures of elastomers which are intended to be used in the manufacture of tires.Type: ApplicationFiled: July 8, 2014Publication date: June 2, 2016Applicants: COMPAGNIE GENERALE DES ETABLISSEMENTS MICHELIN, MICHELIN RECHERCHE ET TECHNIQUE, S.A.Inventors: Arnaud LETOCART, Christophe OUGIER, Gerard CROSNIER
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Publication number: 20150290976Abstract: The device for producing a tire component by winding, comprises: a helicoidal external wall, and means for adjusting a diameter of the wall.Type: ApplicationFiled: October 7, 2013Publication date: October 15, 2015Applicants: COMPAGNIE GENERALE DES ETABLISSEMENTS MICHELIN, MICHELIN RECHERCHE ET TECHNIQUE, S.A.Inventors: Arnaud LETOCART, Gérard CROSNIER, Christophe OUGIER
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Patent number: 9089997Abstract: During the process for production of a rubber mass the rubber mass is mixed in a mixing tank (12); then, the mixing of the rubber mass is interrupted; then, with the mixing stopped, the tank (12) is opened by displacing a door (18) for shutting of an opening (16) for discharge of the rubber mass from the tank (12), according to an opening trajectory between a position of shutting of the opening (16), towards a position of release of the opening (16); the positions of shutting and release corresponding to the ends of the opening trajectory; then, with the tank (12) open, the mixing of the rubber mass is restarted when the door (18) is in a predetermined intermediate position of its trajectory between the positions of shutting and release.Type: GrantFiled: June 14, 2011Date of Patent: July 28, 2015Assignees: COMPAGNIE GENERALE DES ETABLISSEMENTS MICHELIN, Michelin Recherche et Technique S.A.Inventors: Arnaud Letocart, Gérard Crosnier
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Patent number: 8650850Abstract: In a multi-strand steel cable, at least three layers are present. An inner layer includes from 1 to 4 wires. An intermediate layer surrounds the inner layer and includes from 3 to 12 wires wound together in a helix at a pitch p2. An outer layer surrounds the intermediate layer and includes from 8 to 20 wires wound together in a helix at a pitch p3. A rubber sheath covers at least the intermediate layer and is formed of a cross-linkable or cross-linked rubber composition that includes at least one diene elastomer.Type: GrantFiled: July 17, 2012Date of Patent: February 18, 2014Assignee: Michelin Recherche et Technique S.A.Inventors: Henri Barguet, Alain Domingo, Arnaud Letocart, Thibaud Pottier
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Publication number: 20130207313Abstract: During the process for production of a rubber mass the rubber mass is mixed in a mixing tank (12) by means of mechanical means (34); then, the movement of the mechanical means (34) for mixing of the rubber mass is interrupted; then, with the mechanical mixing means (34) stopped, the tank (12) is opened by displacing a door (18) for shutting of an opening (16) for discharge of the rubber mass from the tank (12), according to an opening trajectory between a position of shutting of the opening (16), towards a position of release of the opening (16); the positions of shutting and release corresponding to the ends of the opening trajectory; then, with the tank (12) open, the movement of the mechanical means (34) for mixing of the rubber mass is restarted when the door (18) is in a predetermined intermediate position of its trajectory between the positions of shutting and release.Type: ApplicationFiled: June 14, 2011Publication date: August 15, 2013Applicants: Michelin Rechercher et Technique S.A., COMPAGNIE GENERALE DES ETABLISSEMENTS MICHELINInventors: Arnaud Letocart, Gérard Crosnier
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Publication number: 20120298281Abstract: The present invention relates to a three-layered metal cable of construction L+M+N usable as a reinforcing element for a tire carcass reinforcement, comprising an inner layer C1 having L wires of diameter d1 with L being from 1 to 4, surrounded by an intermediate layer C2 of M wires of diameter d2 wound together in a helix at a pitch p2 with M being from 3 to 12, said layer C2 being surrounded by an outer layer C3 of N wires of diameter d3 wound together in a helix at a pitch p3 with N being from 8 to 20, said cable being characterised in that a sheath formed of a cross-linkable or cross-linked rubber composition based on at least one diene elastomer covers at least said layer C2. The invention furthermore relates to the articles or semi-finished products made of plastics material and/or rubber which are reinforced by such a multi-layer cable, in particular to tires used in industrial vehicles, more particularly heavy-vehicle tires and their carcass reinforcement plies.Type: ApplicationFiled: July 17, 2012Publication date: November 29, 2012Applicant: MICHELIN RECHERCHE ET TECHNIQUE S.A.Inventors: Henri Barguet, Alain Domingo, Arnaud Letocart, Thibaud Pottier