Patents by Inventor Itsuo Tanuma
Itsuo Tanuma 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: 6030108Abstract: The light transmission hose included in the waterproof lighting apparatus according to the present invention is of a watertight structure, so it can easily be used as laid in or on water without any special protective means. Since the light source is installed in a location apart from water, it can be easily maintained and lamp replacement is also easy. By selecting a desired one of the kinds of light source, the illumination can be changed, resulting in a great effect of illumination. If provided with a powerful light source, the waterproof lighting apparatus according to the present invention can be used for warning any hazardous area to walkers, bicycle riders, car drivers, ships, aircraft and the like vehicles. Even if the lighting apparatus is located far away, the light from the light-emitting portion permits the walker or vehicle driver to readily be aware of a hazardous area.Type: GrantFiled: August 9, 1993Date of Patent: February 29, 2000Assignee: Bridgestone CorporationInventors: Minoru Ishiharada, Itsuo Tanuma, Kazuo Naito, Yasuhiko Matsumuro, Takao Aoki, Kiyoshi Koyama
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Patent number: 5982969Abstract: In an optical transmission tube comprising a tubular cladding and a core within the cladding having a higher index of refraction than the cladding, a strip-shaped reflecting layer is longitudinally extended between the cladding and the core. Light passing through the core is reflected and scattered by the reflecting layer to emerge from the tube through an area of the outer surface of the cladding opposed to the reflecting layer. The optical transmission tube is prepared by dispersing scattering particles in a monomer solution; filling a tubular cladding with the monomer solution; resting the cladding horizontally for allowing the scattering particles to settle on a lower inner surface of the cladding; and thereafter, causing the monomer solution to polymerize and solidify within the cladding.Type: GrantFiled: April 24, 1998Date of Patent: November 9, 1999Assignee: Bridgestone CorporationInventors: Hideo Sugiyama, Masato Sugimachi, Minoru Ishiharada, Yasuhiro Morimura, Tatsuo Terahama, Hiroshi Fukuyama, Itsuo Tanuma
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Patent number: 5933560Abstract: A branched type light transmission system including a plurality of light transmission tubes each comprising a flexible cylindrical cladding and a transparent core filled in the cladding and which has a higher index of refraction than the cladding. The core is made of an elastically deformable solid substance, and the plurality of light transmission tubes are bundled together at the light-incident ends thereof with a binding member and thus applied with an external pressure to deform each light transmission tube in order to minimize the clearance between the light transmission tubes.Type: GrantFiled: September 30, 1997Date of Patent: August 3, 1999Assignee: Bridgestone CorporationInventors: Minoru Ishiharada, Atsushi Hotta, Itsuo Tanuma
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Patent number: 5759698Abstract: Laminated glass has sheets of plate glass with a bonding layer intervening therebetween for integration. The bonding layer is formed of a resin composition comprising (A) a terpolymer of ethylene, vinyl acetate, and an acrylate and/or methacrylate monomer, (B) a terpolymer of ethylene, vinyl acetate, and maleic acid and/or maleic anhydride, (C) a terpolymer of ethylene, an acrylate and/or methacrylate monomer, and maleic acid and/or maleic anhydride or (D) an ionomer resin in the form of an ethylene-methacrylic acid copolymer with a metal ion binding molecules thereof as a thermosetting resin, an organic peroxide, and a silane coupling agent. The resin composition is thermoset between the glass sheets.Type: GrantFiled: May 16, 1996Date of Patent: June 2, 1998Assignee: Bridgestone CorporationInventors: Itsuo Tanuma, Yasuhiro Morimura, Hidefumi Kotsubo
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Patent number: 5744534Abstract: A light scattering material is prepared by mixing with and dispersing in a transparent elastomer matrix particles of a transparent material. The matrix has a Tg of lower than room temperature and the transparent material has a different index of refraction form the matrix.Type: GrantFiled: April 12, 1996Date of Patent: April 28, 1998Assignee: Bridgestone CorporationInventors: Minoru Ishiharada, Itsuo Tanuma, Kazuo Naito
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Patent number: 5737471Abstract: In an optical waveguide tube comprising a tubular cladding filled with a solid core having a higher refractive index than the cladding, a light transmissive window member is disposed in close contact with at least the end face of the core on a light incident side for protecting the core end face from thermal influence and contamination. Means disposed around the cladding and the window member for securing the window member to the cladding may be a tape wrapped around them or a heat shrinkable sleeve or a ferrule. Alternatively, a ferrule surrounding the outer periphery of the cladding at each end is fastened for securing the cladding to the core at each end for preventing the core from projecting out of the cladding. The ferrule may have a collar disposed in abutment with the core end face.Type: GrantFiled: May 17, 1996Date of Patent: April 7, 1998Assignee: Bridgestone CorporationInventors: Hideo Sugiyama, Masato Sugimachi, Atsushi Hotta, Minoru Ishiharada, Itsuo Tanuma, Torao Hashimoto
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Patent number: 5692088Abstract: An optical waveguide tube has a transparent core received in a cladding having a lower refractive index than the core. The entire cladding or an inner layer of the cladding fitting on the core is formed of a fluororubber which has been vulcanized by radical crosslinking. The vulcanized fluororubber has a residual halogen atom content of up to 80 ppm. A trapping agent surrounds the cladding for trapping coloring substances. The optical tube maintains satisfactory optical transmission capability over a long time while the core is not colored.Type: GrantFiled: July 28, 1995Date of Patent: November 25, 1997Assignee: Bridgestone CorporationInventors: Minoru Ishiharada, Hideo Sugiyama, Itsuo Tanuma
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Patent number: 5684913Abstract: The invention relates to an optical waveguide tube comprising a tubular cladding filled with a solid core having a higher refractive index than the cladding. In one form, a resin material having a Tg of up to 50.degree. C. and a modulus of elasticity of up to 10.sup.9 dyne/cm.sup.2 is used as the core. In another form, a copolymer of acrylic acid, methacrylic acid or a lower alcohol ester thereof with a higher alkyl (meth)acrylate is used as the core, preferably in combination with a phosphate, aromatic carboxylate, aliphatic carboxylic acid, aliphatic carboxylate or glycol. In a third form, such an optical waveguide tube is prepared by filling a hollow tubular transparent cladding having opposite open ends with a liquid monomeric charge and causing the monomeric charge to polymerize while pressurizing the exposed surfaces of the monomeric charge inwardly from the opposite open ends along an axial direction of the cladding, thereby forming a core within the cladding.Type: GrantFiled: December 21, 1995Date of Patent: November 4, 1997Assignee: Bridgestone CorporationInventors: Hideo Sugiyama, Masato Sugimachi, Masato Yoshikawa, Minoru Ishiharada, Itsuo Tanuma, Kazuo Naito, Atsushi Hotta
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Patent number: 5681611Abstract: A light guide includes a hollow tubular cladding of a fluorocarbon resin having a methacrylic or acrylic monomer graft polymerized inner surface. The cladding is integrally filled with a core of a methacrylic or acrylic resin which is polymerized to the graft polymerized surface.Type: GrantFiled: September 20, 1995Date of Patent: October 28, 1997Assignee: Bridgestone CorporationInventors: Masato Yoshikawa, Minoru Ishiharada, Itsuo Tanuma, Kazuo Naito, Masato Sugimachi, Hideo Sugiyama
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Patent number: 5638480Abstract: An optical waveguide hose includes a hollow tubular cladding made of a material having rubber elasticity at the service temperature of -50.degree. to 150.degree. C. and having a lower creep. The cladding is filled with a core fluid having a higher index of refraction than the cladding and closed with sealing plugs at opposed open ends. The hose is improved in flexibility and handling, prevents gas penetration into the core fluid, maintains transparency at widely varying temperature over a long time, and is lightweight and inexpensive.Type: GrantFiled: October 3, 1995Date of Patent: June 10, 1997Assignee: Bridgestone CorporationInventors: Minoru Ishiharada, Itsuo Tanuma, Kazuo Naito
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Patent number: 5632835Abstract: A laminated glass is composed of glass plates, between which a thermosetting resin composed of a copolymer of ethylene-vinyl acetate, a hydrocarbon resin and an organic peroxide is inserted and cured to intergrate them. An organic resin film is inserted between layers of the thermosetting resin. The thermosetting resin contains dibenzylidene sorbitol and/or tribenzylidene sorbitol. The thermosetting resin contains one or more kinds of silane coupling agent selected from the group consisting of acryloxy group containing compound, methacryloxy group containing compound and aryl group containing compound, and an absorber for ultra violet ray are contained. Preparation of the thermosetting resin is carried out by previously mixing a part of the copolymer of ethylene-vinyl acetate with the hydrocarbon resin to obtain a mixture, mixing residual amount of the copolymer of ethylene-vinyl acetate into the mixture, and adding the organic peroxide to mix.Type: GrantFiled: May 27, 1992Date of Patent: May 27, 1997Assignee: Bridgestone CorporationInventors: Hideyuki Niwa, Yasuhiro Morimura, Hiromi Ohtsuru, Kyoei Yoshida, Itsuo Tanuma, Kazuo Naitoh
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Patent number: 5557702Abstract: A light guide includes a hollow tubular cladding of a fluorocarbon resin having a methacrylic or acrylic monomer graft polymerized inner surface. The cladding is integrally filled with a core of a methacrylic or acrylic resin which is polymerized to the graft polymerized surface.Type: GrantFiled: December 15, 1994Date of Patent: September 17, 1996Assignee: Bridgestone CorporationInventors: Masato Yoshikawa, Minoru Ishiharada, Itsuo Tanuma, Kazuo Naito, Masato Sugimachi, Hideo Sugiyama
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Patent number: 5547762Abstract: A sandwich glass is disclosed containing a thermoset resin layer interposed between glass plates, wherein the thermoset resin layer, prior to thermosetting, contains an uncured resin composition containing:(a) an organic peroxide,(b) an ethylene-vinyl acetate copolymer, and(c) at least one compound selected from the groupconsisting of at least one acryloxy or methacryloxy group-containing compound and a hydrocarbon resin having a ratio of hydrogenation .gtoreq.91%;wherein the at least one acryloxy or methacryloxy group-containing compound is selected from the group consisting of 1-methyl-1,3-dimethacryloxypropane, 2,2-dimethyl-1,3-diacryloxypropane, 2,2-dimethyl-1,3-dimethacryloxypropane, 2-hydroxy-1-acryloxy-3-methacryloxypropane, 2-hydroxy-1,3-dimethacryloxypropane, 1-hydroxy-2-methyl-1,3-diacryloxypropane and 1-hydroxy-2-methyl-1,3-dimethacryloxypropane and the ethylene-vinyl acetate copolymer contains vinyl acetate in an amount of 10-50% by weight.Type: GrantFiled: November 28, 1994Date of Patent: August 20, 1996Assignee: Bridgestone CorporationInventors: Hideyuki Niwa, Kiyomi Sasaki, Kyoei Yoshida, Itsuo Tanuma, Kazuo Naito, Yasuhiro Morimura, Takahiko Koga
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Patent number: 5425832Abstract: Tightly integrated composite products are obtained by treating a fluoropolymer member on its surface with atmospheric pressure glow discharge plasma in a helium gas atmosphere containing 97% by volume or more of helium gas, and joining another member of rubber compositions, resins, metals, ceramics, or semiconductors to the surface treated fluoropolymer member. By using a fluoropolymer sheet as the fluoropolymer member and a metal or synthetic resin layer as the other member, there are obtained weather-resistant composite sheets in which the layer is firmly bonded to the fluoropolymer sheet.Type: GrantFiled: October 30, 1992Date of Patent: June 20, 1995Assignees: Bridgestone Corporation, Satiko Okazaki, Masuhiro KogomaInventors: Yukihiro Kusano, Masato Yoshikawa, Itsuo Tanuma, Yukio Fukuura, Kazuo Naito, Yasuhiro Morimura, Satiko Okazaki, Masuhiro Kogoma
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Patent number: 5372887Abstract: A sandwich glass having high ultraviolet ray-absorbing ability is disclosed. This sandwich glass is produced by interposing a thermosetting resin between 2 glass plates to form a monolithic structure and thermosetting the resin layer, which thermosetting resin uses a benzophenone or benzotriazole series compound as an ultraviolet ray-absorbing agent in a thermosetting resin comprising an ethylene-vinyl acetate copolymer, an organic peroxide, an acryloxy group-, methacryloxy group- or allyl group-containing compound, a silane coupling agent and an ultraviolet ray-absorbing agent.Type: GrantFiled: February 2, 1993Date of Patent: December 13, 1994Assignee: Bridgestone CorporationInventors: Masashi Segawa, Itsuo Tanuma, Kazuo Naito
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Patent number: 5352530Abstract: A highly transparent film having high strength, suitable extensibility, high weather resistance, low moisture absorption and so on is disclosed, which consists mainly of EVAT. And also various laminates making the most of the above properties of the film are disclosed, which comprise the EVAT interposed between two inorganic material sheets, two organic material sheets, or an inorganic material sheet and an organic material sheet.Type: GrantFiled: June 8, 1992Date of Patent: October 4, 1994Assignee: Bridgestone CorporationInventors: Itsuo Tanuma, Hideo Takeichi, Hiromi Ohtsuru, Toshio Honda
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Patent number: 5333227Abstract: An optical waveguide hose includes a hollow tubular cladding, a fluid core in the cladding, the fluid having a higher index of refraction than the cladding, and sealing plugs mated with opposite end openings of the cladding. In one form, the core fluid is filled in the cladding under positive pressure. In another form, a sheath of a gas barrier material encloses the outer periphery of the cladding. The pressurized fluid core or the gas barrier sheath prevents air from penetrating into the core, allowing the hose to maintain its light transmission function.Type: GrantFiled: April 7, 1993Date of Patent: July 26, 1994Assignee: Bridgestone CorporationInventors: Minoru Ishiharada, Rikuhei Itou, Itsuo Tanuma, Kazuo Naito, Yasuhiko Matsumuro, Takao Aoki, Kiyoshi Koyama
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Patent number: 5094918Abstract: A sandwich glass comprises two glass plate and a resin layer interposed therebetween. In this case, the resin layer is produced by adding a hydrocarbon resin and an organic peroxide to ethylene-vinyl acetate copolymer and thermosetting them.Type: GrantFiled: December 10, 1990Date of Patent: March 10, 1992Assignee: Bridgestone CorporationInventors: Hideyuki Niwa, Masashi Segawa, Itsuo Tanuma, Kazuo Naito
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Patent number: 5085721Abstract: An impact-resisting anti-lacerative window glass unit or laminate of a sandwich structure is disclosed, which comprises two exterior plate-like member made of a transparent organic polymer (A) and a transparent organic polymer (B) or a transparent inorganic material, respectively, and multilayer structure intermediate films made of at least two kinds of polymers (C). The multilayer structure intermediate films are interposed between two exterior plate-like members.Type: GrantFiled: May 3, 1990Date of Patent: February 4, 1992Assignee: Bridgestone CorporationInventors: Itsuo Tanuma, Hideo Takeichi, Masashi Segawa, Toshio Honda
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Patent number: 4996110Abstract: A white board comprises a front surface layer composed of a polyester film having undergone a hard coat treatment and a rear surface layer composed of a sheet-like magnet. The white board can be easily attached to and detached from steel walls, glass plates, etc. and stored in a rolled state when not in use.Type: GrantFiled: August 19, 1986Date of Patent: February 26, 1991Assignee: Bridgestone CorporationInventors: Itsuo Tanuma, Hiromi Otsuru, Toshio Honda