Patents by Inventor Yoichi Takizawa
Yoichi Takizawa 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: 9309389Abstract: A rubber composition in which from 80 to 150 parts by weight of carbon black having a nitrogen adsorption specific surface area of from 200 to 400 m2/g is compounded per 100 parts by weight of styrene-butadiene rubber including from 60% to 100% by weight of solution-polymerized styrene-butadiene rubber S-SBR1 and from 40% to 0% by weight of solution-polymerized styrene-butadiene rubber S-SBR2 to result in a total of 100% by weight, the styrene quantity of the S-SBR1 being from 30% to 38% by weight, the vinyl quantity of the S-SBR1 being from 60% to 80% by weight, the glass transition temperature of the S-SBR1 being from ?20° C. to ?5° C., the weight-average molecular weight of the S-SBR1 being from 1,000,000 to 1,800,000, the glass transition temperature of the S-SBR2 being not less than ?30° C. and less than ?20° C., and the weight-average molecular weight of the S-SBR2 being from 1,000,000 to 1,800,000.Type: GrantFiled: March 8, 2012Date of Patent: April 12, 2016Assignee: The Yokohama Rubber Co., LTD.Inventors: Yoichi Takizawa, Naoki Kushida
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Publication number: 20150259515Abstract: Problem: To provide a rubber composition for use in tire treads by which rubber hardness, elastic modulus and rubber strength in the high-temperature state can be enhanced to or beyond conventional levels while dry grip performance is maintained. Means of Solution: A rubber composition in which from 80 to 150 parts by weight of carbon black having a nitrogen adsorption specific surface area of from 200 to 400 m2/g is compounded per 100 parts by weight of styrene-butadiene rubber including from 60% to 100% by weight of solution-polymerized styrene-butadiene rubber S-SBR1 and from 40% to 0% by weight of solution-polymerized styrene-butadiene rubber S-SBR2 so as to result in a total of 100% by weight, the styrene quantity of the S-SBR1 being from 30% to 38% by weight, the vinyl quantity of the S-SBR1 being from 60% to 80% by weight, the glass transition temperature of the S-SBR1 being from ?20° C. to ?5° C.Type: ApplicationFiled: March 8, 2012Publication date: September 17, 2015Inventors: Yoichi Takizawa, Naoki Kushida
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Patent number: 8871832Abstract: Rubber compositions for use in tire treads are disclosed and described. Such a composition may include a rubber component having from 40 to 80 parts by mass of a natural rubber and from 20 to 60 parts by mass of a diene rubber (other than said natural rubber) and, per 100 parts by mass thereof, from 80 to 150 parts by mass of a carbon black having a nitrogen specific surface area of from 250 to 450 m2/g and from 30 to 80 parts by mass of a resin.Type: GrantFiled: February 25, 2011Date of Patent: October 28, 2014Assignee: The Yokohama Rubber Co., LtdInventor: Yoichi Takizawa
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Patent number: 8507582Abstract: A tire tread-use rubber composition includes from 10 to 50 parts by weight of a tackifying resin having a softening point of from 100° C. to 150° C.; from 70 to 130 parts by weight of a carbon black having a nitrogen specific surface area of from 250 to 400 m2/g; from 1 to 3 parts by weight of sulfur; from 0.5 to 4.0 parts by weight of a sulfenamide vulcanization accelerator; and from 1.5 to 5.0 parts by weight of a thiuram vulcanization accelerator per 100 parts by weight of a rubber component; wherein when A is a compounded amount in parts by weight of the sulfenamide vulcanization accelerator, T is a compounded amount in parts by weight of the thiuram vulcanization accelerator, and S is a compounded amount in parts by weight of the sulfur, a weight ratio (A+T)/S is from 2 to 4.Type: GrantFiled: June 15, 2010Date of Patent: August 13, 2013Assignee: The Yokohama Rubber Co. Ltd.Inventor: Yoichi Takizawa
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Publication number: 20120275014Abstract: A twist ball type electronic paper having a transparent electrode side base material having a first base material including a film having transparency, and a transparent electrode formed on one side surface of the first base material; a counter electrode side base material having a second base material including a film with an insulation property, and a counter electrode formed on one side surface of the second base material; and a twist ball layer comprising a twist ball and a low polarity solvent layer including a low polarity solvent, wherein the twist ball layer is sealed with the first base material and the second base material, and that the counter electrode side base material is disposed in such a way that the counter electrode is disposed on an opposite side with respect to the twist ball layer.Type: ApplicationFiled: November 18, 2010Publication date: November 1, 2012Applicants: SOKEN CHEMICAL & ENGINEERING CO., LTD., DAI NIPPON PRINTING CO., LTD.Inventors: Kenichi Ogawa, Hironori Kobayashi, Yoichi Takizawa
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Publication number: 20110213049Abstract: Rubber compositions for use in tire treads are disclosed and described. Such a composition may include a rubber component having from 40 to 80 parts by mass of a natural rubber and from 20 to 60 parts by mass of a diene rubber (other than said natural rubber) and, per 100 parts by mass thereof, from 80 to 150 parts by mass of a carbon black having a nitrogen specific surface area of from 250 to 450 m2/g and from 30 to 80 parts by mass of a resin.Type: ApplicationFiled: February 25, 2011Publication date: September 1, 2011Inventor: Yoichi Takizawa
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Patent number: 7897665Abstract: Provided is a tire rubber composition blended with an antioxidant that is derived from a raw material other than petroleum resources, the tire rubber composition being capable of achieving an oxidation resistance equal to or higher than a conventional level and of improving forming processability and a low hysteresis loss property. The tire rubber composition includes a blend of: 100 parts by weight of a diene rubber; 5 to 130 parts by weight of an inorganic filler; and 0.01 to 10 parts by weight of a tea extract containing a catechin.Type: GrantFiled: June 30, 2009Date of Patent: March 1, 2011Assignee: The Yokohama Rubber Co., Ltd.Inventors: Yoshihiro Kameda, Naoya Amino, Yoichi Takizawa
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Publication number: 20100324168Abstract: A tire tread-use rubber composition includes from 10 to 50 parts by weight of a tackifying resin having a softening point of from 100° C. to 150° C.; from 70 to 130 parts by weight of a carbon black having a nitrogen specific surface area of from 250 to 400 m2/g; from 1 to 3 parts by weight of sulfur; from 0.5 to 4.0 parts by weight of a sulfenamide vulcanization accelerator; and from 1.5 to 5.0 parts by weight of a thiuram vulcanization accelerator per 100 parts by weight of a rubber component; wherein when A is a compounded amount in parts by weight of the sulfenamide vulcanization accelerator, T is a compounded amount in parts by weight of the thiuram vulcanization accelerator, and S is a compounded amount in parts by weight of the sulfur, a weight ratio (A+T)/S is from 2 to 4.Type: ApplicationFiled: June 15, 2010Publication date: December 23, 2010Inventor: Yoichi Takizawa
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Publication number: 20090326109Abstract: Provided is a tire rubber composition blended with an antioxidant that is derived from a raw material other than petroleum resources, the tire rubber composition being capable of achieving an oxidation resistance equal to or higher than a conventional level and of improving forming processability and a low hysteresis loss property. The tire rubber composition includes a blend of: 100 parts by weight of a diene rubber; 5 to 130 parts by weight of an inorganic filler; and 0.01 to 10 parts by weight of a tea extract containing a catechin.Type: ApplicationFiled: June 30, 2009Publication date: December 31, 2009Applicant: THE YOKOHAMA RUBBER CO., LTD.Inventors: Yoshihiro KAMEDA, Naoya AMINO, Yoichi TAKIZAWA
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Patent number: 4988771Abstract: A graft copolymer having dispersion stabilizing effect, which comprises on the carbon backbone thereof a polymer side chain comprising a carbon chain having a molecular weight of 1,000.about.100,000, a fluorine atom containing fluorine side chain and a hydrophilic side chain containing a hydrophilic group, the total mean molecular weight of said graft copolymer being 5,000 or more. The graft copolymer of this invention can be used as an excellent dispersion stabilizer for emulsion polymerization, whereby in emulsion polymerization it is possible to attain polymer particle dispersion stability to ensure that the polymer particles will not be agglomerated even if they have been grown to larger particles having a diameter of 0.5.mu. or more and that dispersion of the polymer particles having a large and uniform particle diameter is obtained.Type: GrantFiled: September 26, 1989Date of Patent: January 29, 1991Assignee: Soken Kagaku Kabushiki KaishaInventors: Fumikatsu Takeuchi, Tsutomu Takeuchi, Noriyuki Osaka, Yoichi Takizawa, Susumu Kawase
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Patent number: 4986999Abstract: An anti-denaturation agent for an edible paste product contains a protein decomposition extract obtained by decomposition of protein by proteinase and saccharides as essential active ingredients.Type: GrantFiled: July 18, 1988Date of Patent: January 22, 1991Assignee: Nihon Bussan Kabushiki KaishaInventors: Takashi Takasaki, Reikichi Yanai, Shigeru Amakawa, Yoichi Takizawa, Akira Iwamoto
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Patent number: 4916191Abstract: A graft copolymer having dispersion stabilizing effect, which is a product of the polymerization of 5 to 30% by weight of a macromonomer which has a molecular weight of 1,000 to 100,000 and has a radical polymerizable unsaturated group at its one end, 1 to 40% by weight of a hydrophillic monomer which has a hydrophillic moiety in it and has a radical polymerizable unsaturated group, and 5 to 40% by weight of a fluorinated monomer which has a florinated moiety in it and has a radical polymerizable unsaturated group, the % by weight being based on a total of the three monomers, and 0 to 50% of the total of the total of the three monomers of a monomer copolymerizable therewith.Type: GrantFiled: June 25, 1987Date of Patent: April 10, 1990Assignee: Soken Kagaku Kabushiki KaishaInventors: Fumikatsu Takeuchi, Tsutomu Takeuchi, Noriyuki Osaka, Yoichi Takizawa, Susumu Kawase