Patents by Inventor Akio Takigawa
Akio Takigawa 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: 6524771Abstract: There are disclosed the following three types of optical recording film: (1) an optical recording film comprising a gel having a network structure of an inorganic substance and a polymer which is from a photopolymerizable compound (A) and present in the network structure in the gel, said gel containing an optical recording-induced difference in the network structure. (2) an optical recording film, which consists essentially of a porous gel having a network structure of an inorganic substance, the porous gel containing recording-induced porosity differences in the network structure. (3) an optical recording film which consists essentially of a porous gel having a network structure of an inorganic substance or a gel obtained by densification of the porous gel, the porous gel or the gel having a recording-induced concavo-convex form on the surface thereof.Type: GrantFiled: July 13, 2001Date of Patent: February 25, 2003Assignee: Nippon Sheet Glass Co., Ltd.Inventors: Koichi Maeda, Hiroaki Yamamoto, Akio Takigawa
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Patent number: 6479193Abstract: There are disclosed the following three types of optical recording film: (1) an optical recording film comprising a gel having a network structure of an inorganic substance and a polymer which is from a photopolymerizable compound (A) and present in the network structure in the gel, said gel containing an optical recording-induced difference in the network structure. (2) an optical recording film, which consists essentially of a porous gel having a network structure of an inorganic substance, the porous gel containing recording-induced porosity differences in the network structure. (3) an optical recording film which consists essentially of a porous gel having a network structure of an inorganic substance or a gel obtained by densification of the porous gel, the porous gel or the gel having a recording-induced concavo-convex form on the surface thereof.Type: GrantFiled: March 28, 1995Date of Patent: November 12, 2002Assignee: Nippon Sheet Glass Co., Ltd.Inventors: Koichi Maeda, Hiroaki Yamamoto, Akio Takigawa
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Publication number: 20020004172Abstract: There are disclosed the following three types of optical recording film:Type: ApplicationFiled: July 13, 2001Publication date: January 10, 2002Inventors: Koichi Maeda, Hiroaki Yamamoto, Akio Takigawa
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Patent number: 5498475Abstract: A coated plastic molded article comprising a plastic molded article on the surface of which are laminated (a) a first layer comprising a cured composition containing a partially hydrolyzed product of at least one silicon compound, (b) a second layer comprising a cured, partially hydrolyzed product of a second silicon compound, and (c) a third layer comprising silicon dioxide from an aqueous hydrosilicofluoric acid solution supersaturated with silicon dioxide, the coating layers being applied to the plastic molded article in the order stated; and alternate embodiments of a process for preparing the coated plastic molded articles.Type: GrantFiled: December 2, 1993Date of Patent: March 12, 1996Assignee: Nippon Sheet Glass Co., Ltd.Inventors: Akio Takigawa, Naoto Hirayama, Masaki Kitaoka
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Patent number: 5486937Abstract: Disclosed is a liquid crystal device comprising a pair of transparent substrates, transparent conductive films respectively disposed on the inner surfaces of the transparent substrates, and containment means containing a liquid crystal material in gaps interposed between the transparent conductive films, wherein an average refractive index (n.sub.a) of the liquid crystal material, a refractive index (n.sub.b) of the containment means, a total surface quantity (S) [.mu.m.sup.-1 ] of the gaps, and a distance (t) [.mu.m] between the transparent conductive films satisfy the following equation,.vertline.n.sub.a -n.sub.b .vertline..times.S.times.t.gtoreq.4.2.Type: GrantFiled: June 20, 1994Date of Patent: January 23, 1996Assignee: Nippon Sheet Glass Co., Ltd.Inventors: Yuichi Yano, Naoki Kinugasa, Akio Takigawa
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Patent number: 5415927Abstract: An inorganic or organic glass product, or tempered glass product excellent in weatherability, water resistance, moisture resistance and abrasion resistance, which is formed of a) a silicate glass substrate, b) a porous modified layer enriched with silicon oxide through removal of components other than silicon oxide in a surface layer of the silicate glass substrate, and c) a water-repellent layer formed of at least one compound of an organic silicon compound and an organic fluorine compound on a surface of the porous modified layer.Type: GrantFiled: September 30, 1992Date of Patent: May 16, 1995Assignees: Nippon Sheet Glass Co., Ltd., Toyota Jidosha Kabushiki KaishaInventors: Naoto Hirayama, Hirotsugu Nagayama, Akio Takigawa, Kiyotaka Sasaki, Misao Tsutsuki, Yasuhiro Otsuka
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Patent number: 5171806Abstract: A composition for an optical material, which comprises an N-phenylmaleimide, a di(meth)allyl diphenate and a bisphenol ester.The N-phenylmaleimide, the di(meth)allyl diphenate and the bisphenol ester are contained in amounts of 1 to 50% by weight, 5 to 50% by weight and 1 to 30% by weight, based on the total weight of these components, respectively, The composition affords a three-dimensionally crosslinked resin by radical polymerization. The resin is useful for an optical material.Type: GrantFiled: July 12, 1991Date of Patent: December 15, 1992Assignee: Nippon Sheet Glass Co., Ltd.Inventors: Hisayuki Kayanoki, Koichi Maeda, Akio Takigawa
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Patent number: 5108857Abstract: A light control sheet capable of scattering an incident light of particular incident angle is produced by a method composed of preparing a film of a composition containing at least two photopolymerizable components having different refractive indexes, irradiating on the film a light from a particular direction, and obtaining a cured film of the light control sheet product. Such other light control sheets as capable of scattering a plurality of incident lights each of particular incident angle are obtained by modification of the above-mentioned method.Type: GrantFiled: April 5, 1990Date of Patent: April 28, 1992Assignees: Sumitomo Chemical Company, Limited, Nippon Sheet Glass Co., Ltd.Inventors: Shinichiro Kitayama, Teruho Adachi, Masahiro Ueda, Yuichi Aoki, Satoshi Shiiki, Akio Takigawa, Motoaki Yoshida, Naoya Imamura, Koichi Maeda, Hisayuki Kayanoki
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Patent number: 4956227Abstract: A laminated structure composed of (A) a layer comprising a polyester resin, (B) a layer comprising a cured (meth)acrylate polymer containing an epoxy group in the molecule, and (C) a layer comprising a cured organopolysiloxane compound, the layers (A), (B) and (C) being laminated in this sequence. The laminated structure is suitable for use in a safety glass, for example.Type: GrantFiled: November 16, 1988Date of Patent: September 11, 1990Assignee: Nippon Sheet Glass Co., Ltd.Inventors: Naoto Hirayama, Yuichi Aoki, Akio Takigawa, Motoaki Yoshida, Yasunori Shiraishi
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Patent number: 4944584Abstract: A plastic multifocal point spherical lens comprising a unitary structure of (A) a first synthetic resin layer having a fixed refractive index, (B) a second synthetic resin layer having a substantially fixed refractive index different from the refractive index of the first synthetic resin layer, and (C) a third synthetic resin layer existing between the first synthetic resin layer and the second synthetic resin layer and having a refractive index gradient varying continuously from the refractive index of the first synthetic resin layer to that of the second synthetic resin layer, part of the second synthetic resin layer and part of the third synthetic resin layer together being recessed into the first synthetic resin layer, and the second synthetic resin layer being thicker at the recessed part than the rest.Type: GrantFiled: February 23, 1989Date of Patent: July 31, 1990Assignee: Nippon Sheet Glass Co., Ltd.Inventors: Koichi Maeda, Akio Takigawa, Yasuyoshi Tago, Motoaki Yoshida
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Patent number: 4929523Abstract: A light control sheet capable of scattering an incident light of particular incident angle is produced by a method composed of preparing a film of a composition containing at least two photopolymerizable components having different refractive indexes, irradiating on the film a light from a particular direction, and obtaining a cured film of the light control sheet product. Such other light control sheets as capable of scattering a plurality of incident lights each of particular incident angle are obtained by modification of the above-mentioned method.Type: GrantFiled: December 16, 1987Date of Patent: May 29, 1990Assignees: Sumitomo Chemical Company Limited, Nippon Sheet Glass Co., Ltd.Inventors: Shinichiro Kitayama, Teruho Adachi, Masahiro Ueda, Yuichi Aoki, Satoshi Shiiki, Akio Takigawa, Motoaki Yoshida, Naoya Imamura, Koichi Maeda, Hisayuki Kayanoki
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Patent number: 4925737Abstract: A laminated structure comprising a polyester film and a polyvinylbutyral sheet which are laminated through an adhesive layer obtained by curing a composition comprising an amino group-containing organosilicon compound of the following formula ##STR1## preferably its hydrolytic condensation product and a diamine of the formulaH.sub.2 N--R--NH.sub.2 (II)All symbols in these formulae are as defined in the specification. The structure is particularly useful in an automobile safety glass.Type: GrantFiled: December 7, 1988Date of Patent: May 15, 1990Assignee: Nippon Sheet Glass Co., Ltd.Inventors: Tsuyoshi Baba, Akio Takigawa, Naoto Hirayama, Motoaki Yoshida
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Patent number: 4405679Abstract: A coated shaped article of a polycarbonate type resin of improved abrasion resistance, which comprises: (I) a shaped substrate of a polycarbonate type resin, (II) an undercoat layer applied to and cured on said substrate, an (III) an overcoat layer applied to and cured on the undercoat layer, which overcoat is formed of a composition containing: (A) at least one hydrolyzate selected from the group of epoxy group-containing silicon compounds, (B) at least one member selected from the group consisting of hydrolyzates of organic silicon compounds colloidal silica and organic titanium compounds, and (C) a curing catalyst.Type: GrantFiled: January 5, 1981Date of Patent: September 20, 1983Assignees: Nippon Sheet Glass Co. Ltd., Sumitomo Chemical Company, LimitedInventors: Akira Fujioka, Kazuo Sakiyama, Akio Takigawa, Motoaki Yoshida
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Patent number: 4394177Abstract: A coating composition, which comprises: (A) at least one hydrolyzate selected from the group of epoxy group-containing silicon compounds, (B) at least one member selected from the group consisting of hydrolyzates of organic silicon compounds, colloidal silica and organic titanium compounds, and (C) a curing catalyst.Type: GrantFiled: January 5, 1981Date of Patent: July 19, 1983Assignees: Sumitomo Chemical Company, Limited, Nippon Sheet Glass Co. Ltd.Inventors: Akira Fujioka, Kazuo Sakiyama, Akio Takigawa, Motoaki Yoshida