Patents by Inventor Takahisa Shizuku
Takahisa Shizuku 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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Patent number: 11920295Abstract: Provided is an elastomer reinforcement cord in which the problem of stress concentration at an interface between an elastomer and a metal cord is solved and the durability is thereby improved. The elastomer reinforcement cord includes metal filaments (1a) and (1b), and a polymer material (3) having a melting point or softening point of 80° C. to 160° C. The elastomer reinforcement cord has a core (11) and at least one sheath layer (12). In a region surrounded by a line connecting the centers of the metal filaments constituting the outermost sheath layer at a cross-section in a direction orthogonal to an axial direction after vulcanization, when a region occupied by other than the metal filaments is defined as a gap region, the polymer material is contained in this gap region, and a filling rate, which is a ratio of the area of the polymer material, is higher than 120%, taking the area of the gap region as 100%.Type: GrantFiled: October 29, 2019Date of Patent: March 5, 2024Assignee: BRIDGESTONE CORPORATIONInventor: Takahisa Shizuku
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Patent number: 11795613Abstract: Provided is an elastomer reinforcement cord with improved rust inhibition. An elastomer reinforcement cord (10) includes metal filaments and a polymer material. The elastomer reinforcement cord (10) has a multi-strand structure which includes: at least one core strand (21) formed by twisting plural metal filaments (1a) and (1b) together; and two or more sheath strands (22) each formed by twisting plural metal filaments (11a) and (11b) together, and in which the sheath strands are twisted together around the core strand. In a region surrounded by a line connecting the centers of the metal filaments constituting the outermost sheath layer of the core strand at a cross-section in a direction orthogonal to an axial direction after vulcanization of the core strand, when a region occupied by other than the metal filaments is defined as a gap region, a filling rate, which is a ratio of the area of the polymer material with respect to the gap region, is 52% to 120%.Type: GrantFiled: October 29, 2019Date of Patent: October 24, 2023Assignee: BRIDGESTONE CORPORATIONInventor: Takahisa Shizuku
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Patent number: 11760129Abstract: Provided is a tire in which a steel cord applied to a carcass ply has improved corrosion resistance to water penetration, fretting resistance, and cord untwisting resistance. Provided is a tire including a carcass ply (1) as a skeleton. The carcass ply is reinforced by a steel cord including no wrapping filament. The steel cord is composed of a plurality of steel filaments having 3 or more core filaments, at least a part of the surface of each of the plurality of steel filaments is coated with a resin material containing at least an ionomer, and when a resin component contained in the resin material is composed of a single resin, the melting point of the resin material is 150° C. or less, and when the resin component is composed of a composition containing two or more resins, the softening point of the resin material is 150° C. or less.Type: GrantFiled: October 24, 2018Date of Patent: September 19, 2023Assignee: BRIDGESTONE CORPORATIONInventor: Takahisa Shizuku
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Patent number: 11585044Abstract: A cord for reinforcing elastomers excellent in adhesion to elastomers such as rubber is provided. The cord is a cord for reinforcing elastomers (10) that includes metallic filaments (1) and a resin filament (2) twisted together, the resin filament (2) being made from a polymeric material having a melting point or softening point of 80 to 160° C.Type: GrantFiled: October 25, 2019Date of Patent: February 21, 2023Assignee: BRIDGESTONE CORPORATIONInventors: Takahisa Shizuku, Nobuhiro Ando, Norihiko Kaga
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Publication number: 20220063415Abstract: The carcass of the pneumatic tire includes a plurality of carcass cords formed of conductors and arranged along the tire radial direction and the tire width direction, and a circumferential cord formed of conductors and arranged along the tire circumferential direction. The circumferential cord contacts the carcass cord.Type: ApplicationFiled: December 17, 2019Publication date: March 3, 2022Applicant: BRIDGESTONE CORPORATIONInventors: Yasumichi WAKAO, Masaaki NAKAMURA, Takahisa SHIZUKU
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Publication number: 20210395947Abstract: Provided is an elastomer reinforcement cord in which the problem of stress concentration at an interface between an elastomer and a metal cord is solved and the durability is thereby improved. The elastomer reinforcement cord includes metal filaments (1a) and (1b), and a polymer material (3) having a melting point or softening point of 80° C. to 160° C. The elastomer reinforcement cord has a core (11) and at least one sheath layer (12). In a region surrounded by a line connecting the centers of the metal filaments constituting the outermost sheath layer at a cross-section in a direction orthogonal to an axial direction after vulcanization, when a region occupied by other than the metal filaments is defined as a gap region, the polymer material is contained in this gap region, and a filling rate, which is a ratio of the area of the polymer material, is higher than 120%, taking the area of the gap region as 100%.Type: ApplicationFiled: October 29, 2019Publication date: December 23, 2021Applicant: BRIDGESTONE CORPORATIONInventor: Takahisa SHIZUKU
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Publication number: 20210394560Abstract: Provided is an elastomer reinforcement cord with improved rust inhibition. An elastomer reinforcement cord (10) includes metal filaments and a polymer material. The elastomer reinforcement cord (10) has a multi-strand structure which includes: at least one core strand (21) formed by twisting plural metal filaments (1a) and (1b) together; and two or more sheath strands (22) each formed by twisting plural metal filaments (11a) and (11b) together, and in which the sheath strands are twisted together around the core strand. In a region surrounded by a line connecting the centers of the metal filaments constituting the outermost sheath layer of the core strand at a cross-section in a direction orthogonal to an axial direction after vulcanization of the core strand, when a region occupied by other than the metal filaments is defined as a gap region, a filling rate, which is a ratio of the area of the polymer material with respect to the gap region, is 52% to 120%.Type: ApplicationFiled: October 29, 2019Publication date: December 23, 2021Applicant: BRIDGESTONE CORPORATIONInventor: Takahisa SHIZUKU
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Publication number: 20200290403Abstract: Provided is a tire in which a steel cord applied to a carcass ply has improved corrosion resistance to water penetration, fretting resistance, and cord untwisting resistance. Provided is a tire including a carcass ply (1) as a skeleton, the carcass ply is reinforced by a steel cord including no wrapping filament. The steel cord is composed of a plurality of steel filaments having 3 or more core filaments, at least a part of the surface of each of the plurality of steel filaments is coated with a resin material containing at least an ionomer, and when a resin component contained in the resin material is composed of a single resin, the melting point of the resin material is 150° C. or less, and when the resin component is composed of a composition containing two or more resins, the softening point of the resin material is 150° C. or less.Type: ApplicationFiled: October 24, 2018Publication date: September 17, 2020Applicant: BRIDGESTONE CORPORATIONInventor: Takahisa SHIZUKU
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Publication number: 20200055340Abstract: A cord for reinforcing elastomers excellent in adhesion to elastomers such as rubber is provided. The cord is a cord for reinforcing elastomers (10) that includes metallic filaments (1) and a resin filament (2) twisted together, the resin filament (2) being made from a polymeric material having a melting point or softening point of 80 to 160° C.Type: ApplicationFiled: October 25, 2019Publication date: February 20, 2020Applicant: BRIDGESTONE CORPORATIONInventors: Takahisa Shizuku, Nobuhiro Ando, Norihiko Kaga
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Publication number: 20190329593Abstract: Provided is a method for manufacturing a tire using a steel cord which can be manufactured without reducing productivity and can prevent propagation of moisture inside. The method for manufacturing a tire includes a vulcanization step of vulcanizing a green tire provided with a belt having at least one belt layer, in which the belt layer includes a steel cord 10 formed by twisting a steel filament 2 together with a resin filament 1 having a softening point of 125° C. or lower, and the resin filament 1 includes at least an ionomer.Type: ApplicationFiled: June 23, 2017Publication date: October 31, 2019Applicant: BRIDGESTONE CORPORATIONInventors: Takahisa SHIZUKU, Masaaki NAKAMURA
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Patent number: 9579704Abstract: Provided is a method for manufacturing a brass-plated steel wire in which improvement in the quality of the brass-plated steel wire and energy saving in the manufacturing process are balanced and a brass-plated steel wire obtained by the method. The method is a method for manufacturing a brass-plated steel wire comprising a plating process in which a steel wire rod is brass plated and a final wire drawing process in which the obtained brass-plated steel wire rod is subjected to a final drawing. The method includes a zinc oxide removing process in which the amount of zinc oxide on the surface of the brass-plated steel wire rod is made smaller than 50 mg/m2 before the final wire drawing process.Type: GrantFiled: November 8, 2012Date of Patent: February 28, 2017Assignee: BRIDGESTONE CORPORATIONInventor: Takahisa Shizuku
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Publication number: 20110228377Abstract: The present invention provides an information display panel capable of maintaining an excellent image property even after repeated rewrite, and particles for display media used therefor. The information display panel, in which at least one kind of display media including a charged particle for display media are sealed in a space between substrates at least one of which is transparent, for displaying an image by application of electrostatic force to the display media by means of an electronic field forming means, uses the particle for display media comprised of a mother particle, child particles and fine particles. The child particles, having a molecular structure of three-dimensional crosslinked structure and a particle diameter smaller than that of the mother particle which has no molecular structure of three-dimensional crosslinked structure, are embedded in a surface of the mother particle. It thereby hardens the surface of the mother particle.Type: ApplicationFiled: August 6, 2008Publication date: September 22, 2011Applicant: BRIDGESTONE CORPORATIONInventors: Norihiko Kaga, Takahisa Shizuku
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Patent number: 7565774Abstract: A seismic isolation apparatus features damping characteristics equivalent to or better than prior art, without burdening the environment. In this seismic isolation apparatus, a cylindrical cavity portion is formed at the middle of an outer side laminated body, which has a form in which respective pluralities of resiliently deformable rubber rings and metal rings for maintaining rigidity are alternately laminated. A helically formed coil spring is disposed in this cavity portion so as to be snugly fitted. An inner side laminated body, which has a form in which respective pluralities of resiliently deformable rubber plates and metal plates for maintaining rigidity are alternately laminated, is disposed at an inner peripheral side of the coil spring.Type: GrantFiled: December 6, 2005Date of Patent: July 28, 2009Assignee: Bridgestone CorporationInventors: Takahisa Shizuku, Masami Kikuchi, Katsuhiro Kobayashi, Yoshikatsu Sakai, Wataru Seki, Takashi Yokoi
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Patent number: 7347317Abstract: Methods and devices for measuring elongation, wear, and internal temperature of a conveyor belt to catch signs of conveyor belt failure such as breakage by detecting a magnetic field from a magnetic body by using a magnesium sensor, as well as a rubber magnet sheet as a magnetic body and a method of producing the sheet, the rubber magnet sheet being able to be used while it is embedded in the conveyor belt. To measure elongation of a running conveyor belt (11), a magnetic field of a magnetic body (2) embedded in the belt (11) is detected by a magnetism sensor (3) fixed to the earth, and elongation of the belt (11) is calculated from temporal variation of the detected magnetic field.Type: GrantFiled: July 1, 2004Date of Patent: March 25, 2008Assignee: Bridgestone CorporationInventors: Satoshi Aizawa, Takahisa Shizuku, Masami Kikuchi, Kenichi Higashi
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Patent number: 7302868Abstract: There is provided an apparatus for measuring forces acted upon a tire in which a radial force and a peripheral force acting to the tire, which are required for the high precision measurement of a friction coefficient on a road surface, are simply measured in a high precision by detecting a magnetic field formed by a magnet fixed to a tread portion of the tire by a magnetic sensor fixed to a rim and measuring the forces acting to the tire from a variant pattern of a magnetic flux density detected un the rotation of the tire and without influencing upon the balance of the tire, which contributes to the high precision measurement of the friction coefficient on the road surface.Type: GrantFiled: June 11, 2003Date of Patent: December 4, 2007Assignee: Bridgestone CorporationInventors: Hiroshi Shima, Katsuhiro Kobayashi, Wataru Seki, Yukio Aoike, Takahisa Shizuku
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Publication number: 20070085251Abstract: A damping alloy member 1 is constructed in such a manner that the improvement consists of a twin crystal type damping alloy made of Cu—Al—Mn alloy, Mg—Zr alloy, Mn—Cu alloy, Mn—Cu—Ni—Fe alloy, Cu—Al—Ni alloy, Ti—Ni alloy, Al—Zn alloy, Cu—Zn—Al alloy, Mg alloy, Cu—Si alloy, Fe—Mn—Si alloy, Fe—Ni—Co—Ti alloy, Fe—Ni—C alloy, Fe—Cr—Ni—Mn—Si—Co alloy and Ni—Al alloy, and has a shape of a flake, a wire or a spring for optimizing a deformation of the alloy. Moreover, a rubber vibration isolator, a floor vibration damping apparatus, a tire, a steel cord and a quake-absorbing rubber are constructed by using the damping apply member.Type: ApplicationFiled: September 24, 2004Publication date: April 19, 2007Applicant: BRIDGESTONE CORPORATIONInventors: Masami Kikuchi, Takashi Yokoi, Takahisa Shizuku, Satoshi Aizawa, Kazutomo Murakami, Hiroyuki Ueda, Shigenobu Suzuki
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Publication number: 20060219528Abstract: Methods and devices for measuring elongation, wear, and internal temperature of a conveyor belt to catch signs of conveyor belt failure such as breakage by detecting a magnetic field from a magnetic body by using a magnesium sensor, as well as a rubber magnet sheet as a magnetic body and a method of producing the sheet, the rubber magnet sheet being able to be used while it is embedded in the conveyor belt. To measure elongation of a running conveyor belt (11), a magnetic field of a magnetic body (2) embedded in the belt (11) is detected by a magnetism sensor (3) fixed to the earth, and elongation of the belt (11) is calculated from temporal variation of the detected magnetic field.Type: ApplicationFiled: July 1, 2004Publication date: October 5, 2006Applicant: BRIDGESTONE CORPORATIONInventors: Satoshi Aizawa, Takahisa Shizuku, Masami Kikuchi, Kenichi Higashi
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Publication number: 20060137264Abstract: A seismic isolation apparatus features damping characteristics equivalent to or better than prior art, without burdening the environment. In this seismic isolation apparatus, a cylindrical cavity portion is formed at the middle of an outer side laminated body, which has a form in which respective pluralities of resiliently deformable rubber rings and metal rings for maintaining rigidity are alternately laminated. A helically formed coil spring is disposed in this cavity portion so as to be snugly fitted. An inner side laminated body, which has a form in which respective pluralities of resiliently deformable rubber plates and metal plates for maintaining rigidity are alternately laminated, is disposed at an inner peripheral side of the coil spring.Type: ApplicationFiled: December 6, 2005Publication date: June 29, 2006Inventors: Takahisa Shizuku, Masami Kikuchi, Katsuhiro Kobayashi, Yoshikatsu Sakai, Wataru Seki, Takashi Yokoi
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Publication number: 20060102263Abstract: There is provided a magnetized tire provided with a magnetic force pattern having a peak capable of sufficiently detecting by a magnetic sensor arranged outside the tire by forming a part of wire filaments in a belt comprised of steel cords with a hard magnetic material or arranging a hard magnetic material in a tread portion to constitute the magnetized tire.Type: ApplicationFiled: May 19, 2003Publication date: May 18, 2006Inventors: Masami Kikuchi, Yukio Aoike, Takahisa Shizuku, Toshiaki Arai
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Publication number: 20060061011Abstract: A carbon nanotube orientated composite formed by orientating carbon nanotubes in a given direction in a matrix having a heat conductivity lower than that of carbon nanotube, in which at least a part of carbon nanotubes are contacted with each other to be continuous from one end to the other end between both ends in the orientated direction, is provided as a material having a heat conductivity considerably higher than that of copper, aluminum or the like or a material to be disposed in rubber material having a low heat releasing characteristic to considerably improve the heat conduction, and also there are provided a method of producing the same as well as a pneumatic tire, a wheel for a vehicle, a tire-wheel assembly and a disc brake using this material.Type: ApplicationFiled: September 25, 2003Publication date: March 23, 2006Inventors: Masami Kikuchi, Iki Harada, Keiichiro Mizuno, Itsuo Tanuma, Masao Ogawa, Satoshi Aizawa, Yukio Aoike, Takahisa Shizuku