Patents by Inventor Ryota Fujio

Ryota Fujio 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).

  • Publication number: 20220185673
    Abstract: A method for detecting abnormal growth of graphene includes: measuring, through spectroscopic ellipsometry, a reflection spectrum of a measurement object having a graphene film formed through CVD on a substrate; creating a film structure model, calculating polarization parameters, and matching calculated values of the polarization parameters to measured values through fitting; and detecting abnormal growth of the graphene based on a value of goodness of fit obtained when fitting the polarization parameters.
    Type: Application
    Filed: March 5, 2020
    Publication date: June 16, 2022
    Inventors: Ryota IFUKU, Takashi MATSUMOTO, Akira FUJIO, Shin KONO
  • Publication number: 20220155242
    Abstract: A method of detecting an abnormal growth of graphene includes: preparing an inspection target having a graphene film formed on a substrate by CVD; receiving light from the graphene film by using a dark field optical system; and inspecting the received light, thereby detecting the abnormal growth of the graphene.
    Type: Application
    Filed: February 26, 2020
    Publication date: May 19, 2022
    Inventors: Ryota IFUKU, Takashi MATSUMOTO, Akira FUJIO, Kousaku SAITO
  • Patent number: 6025450
    Abstract: A functionalized polymer includes a polymer chain carrying at least one functional group selected from alkyl, dialkyl and cycloalkyl amine radicals having the general formula ##STR1## and cyclic amine radicals having the general formula ##STR2## where R.sub.1 is an alkyl, cycloalkyl or aralkyl having from 1 to about 12 carbon atoms, and R.sub.2 is an alkylene, substituted alkylene, oxy- or N-alkylamino-alkylene group having from about 3 to about 16 methylene groups. The invention also provides products based upon such polymers.
    Type: Grant
    Filed: July 9, 1998
    Date of Patent: February 15, 2000
    Assignee: Bridgestone Corporation
    Inventors: David F. Lawson, Mark L. Stayer, Jr., David Saffles, Koichi Morita, Yoichi Ozawa, Ryota Fujio, Thomas A. Antkowiak
  • Patent number: 5916962
    Abstract: A rubber composition having good breaking properties, high tan.delta., good wear resistance and a method for preparing a copolymer used in the rubber composition. The copolymer is a butadiene-styrene copolymer prepared in the presence of an organopotassium compound, an oxolanyl alkane and an organolithium initiator compound. The copolymer may be modified. A vulcanite of the rubber composition including 20 parts or more of the copolymer of the present invention has good properties.
    Type: Grant
    Filed: May 23, 1996
    Date of Patent: June 29, 1999
    Assignee: Bridgestone Corporation
    Inventors: Tadashi Shibata, Ryota Fujio
  • Patent number: 5625017
    Abstract: A process for preparing a polymer comprises polymerizing a conjugated diene monomer and/or a vinylaromatic hydrocarbon monomer in a hydrocarbon solvent in the presence of or in the absence of a randomizer by using a lithium polymerization initiator which is formed by bringing an organolithium compound and at least one secondary amine compound into contact with each other in the polymerization system in the presence of at least said monomer, wherein the polymerization conversion at the time of contact is less than 5%. The secondary amine is an amine compound having two hydrocarbon groups bonded to N or an imine compound in which an NH group and a saturated or unsaturated cyclic structure group form a cyclic structure. The cyclic structure group comprises a hydrocarbon group as the ring member and may also comprise N or O.
    Type: Grant
    Filed: September 21, 1995
    Date of Patent: April 29, 1997
    Assignee: Bridgestone Corporation
    Inventors: Koichi Morita, Atsushi Nakayama, Yoichi Ozawa, Ryota Fujio
  • Patent number: 5576376
    Abstract: A rubber composition having good physical properties such as breaking properties, wear strength and grip properties, and good processability at the same time is suitable for a high performance tire. A nitrogen containing polymer with a weight average molecular weight of 70.times.10.sup.4 to 250.times.10.sup.4 is compounded with 60 to 200 phr of carbon black, a softener comprising 30 to 250 phr of a process oil and/or 5 to 100 phr of liquid polymer, and not more than 60 parts of another polymer.
    Type: Grant
    Filed: March 28, 1994
    Date of Patent: November 19, 1996
    Assignee: Bridgestone Corporation
    Inventors: Tadashi Shibata, Ryota Fujio
  • Patent number: 5550200
    Abstract: A rubber composition, having good breaking properties, high tan.delta., good wear resistance and a method for preparing a copolymer used in the rubber composition. The copolymer is a butadiene-styrene copolymer prepared in the presence of an organopotassium compound, an oxolanyl alkane and an organolithium initiator compound. The copolymer may be modified. A vulcanite of the rubber composition including 20 parts or more of the copolymer of the present invention has good properties.
    Type: Grant
    Filed: June 7, 1995
    Date of Patent: August 27, 1996
    Assignee: Bridgestone Corporation
    Inventors: Tadashi Shibata, Ryota Fujio
  • Patent number: 5514753
    Abstract: A block copolymer containing a non-polar polymer block and a polar polymer block was prepared by using an anionic polymerization initiator, by reacting an organic compound which can form an ate complex at the active end of the non-polar polymer block, the compound which contains a main group element of II or III group, before the addition of the polar monomer.
    Type: Grant
    Filed: June 30, 1994
    Date of Patent: May 7, 1996
    Assignee: Bridgestone Corporation
    Inventors: Yoichi Ozawa, Ryota Fujio
  • Patent number: 5329005
    Abstract: The present invention is directed toward anionic polymerization initiators which are soluble in hydrocarbon solvents. The initiators include a lithio amine having the general formula ALi. The component A is a dialkyl or dicycloalkyl amine radical or a cyclic amine. The invention is also directed toward polymers and other products made using the initiator, and methods therefor. Further, the invention contemplates a polymer, a polymer composition and products therefrom, which include a functional group from the reaction product of an amine and an organolithium compound. The resulting polymers may be terminated with a terminating, coupling or linking agent, which may provide the polymer with a multifunctionality.
    Type: Grant
    Filed: October 2, 1992
    Date of Patent: July 12, 1994
    Assignee: Bridgestone Corporation
    Inventors: David F. Lawson, Koichi Morita, Yoichi Ozawa, Mark L. Stayer, Jr., Ryota Fujio
  • Patent number: 5292790
    Abstract: A conjugated diene series rubber composition comprises 100 parts by weight of a diene series rubber containing at least 30 parts by weight of a particular modified styrene-butadiene copolymer rubber, and 30-80 parts by weight of a specified carbon black, and is excellent in strength at breakage, abrasion resistance and low fuel consumption after vulcanization.
    Type: Grant
    Filed: July 29, 1992
    Date of Patent: March 8, 1994
    Assignee: Bridgestone Corporation
    Inventors: Takashi Shimizu, Takashi Kitamura, Ryota Fujio
  • Patent number: 5250630
    Abstract: A heat resistant pneumatic tire whose tread is composed of a rubber composition comprising, as a main rubber component, a modified, conjugated diene based polymer prepared by adding an .alpha., .beta.-unsaturated carboxylic acid represented by the following general formula: ##STR1## wherein R.sub.1, R.sub.2 and R.sub.3 independently represent hydrogen atom, halogen atom, or an alkyl, alkenyl or allyl group having at most 5 carbon atoms, or a substituted alkyl, alkenyl or allyl group,to a conjugated diene based polymer in an amount within the range between 0.1% and 5.0% based on the weight of the conjugated diene based polymer. This tire is suitable for continuous running at high temperatures and maintains a good road-surface-grip performance even during such running.
    Type: Grant
    Filed: April 26, 1991
    Date of Patent: October 5, 1993
    Assignee: Bridgestone Corporation
    Inventors: Nobumitsu Oshima, Takashi Kitamura, Ryota Fujio, Kenji Matsuo
  • Patent number: 5183543
    Abstract: There is provided a polyaniline having a thickness of 0.3 to 5 mm which is suitable for an electronic material, particularly for an electrode material in a cell. Also provided is a cell comprising a positive electrode, a negative electrode and an electrolyte in which the polyaniline having a thickness of 0.3 to 5 mm is employed in at least one of the positive and negative electrodes, the cell having a high energy density and good cell performance stable for a long period of time.
    Type: Grant
    Filed: May 15, 1986
    Date of Patent: February 2, 1993
    Assignee: Bridgestone Corporation
    Inventors: Shinichi Toyosawa, Tadashi Nakajima, Kinya Suzuki, Takahiro Kawagoe, Tadaaki Miyazaki, Takashi Kitamura, Tadashi Fuse, Masao Ogawa, Yoshitomo Masuda, Hideharu Daifuku, Ryota Fujio
  • Patent number: 5137981
    Abstract: A novel halogenated polybutadiene series elastomer is produced by reacting a polybutadiene series elastomer with a particular active halogen group-containing compound in the presence of a particular organic halogenating agent. The resulting halogenated polybutadiene series elastomer can be subjected to heat-resistant crosslinking with a particular polyvalent amine, and is suitable for the preparation of rubber compositions for tire requiring the heat resistance.
    Type: Grant
    Filed: May 26, 1989
    Date of Patent: August 11, 1992
    Assignee: Bridgestone Corporation
    Inventors: Tomoharu Yamada, Ryota Fujio
  • Patent number: 5104476
    Abstract: Two vulcanizates are adhered to each other by (I) applying a particular rubber cement composition to surfaces of the vulcanizates to be adhered and drying it; and (II) sandwiching an unvulcanized rubber sheet of a particular cushion rubber composition between the applied surfaces of the vulcanizates and fulcanizing them at a temperature of 0.degree.-100.degree. C. under pressure.
    Type: Grant
    Filed: March 21, 1990
    Date of Patent: April 14, 1992
    Assignee: Bridgestone Corporation
    Inventors: Tomoharu Yamada, Ryota Fujio
  • Patent number: 4717634
    Abstract: An electric cell comprises a positive electrode, a negative electrode and an electrolytic solution, characterized in that a positive active material of the positive electrode is a polyaniline, a negative electrode active material of the negative electrode is lithium or a lithium alloy containing 4.times.10.sup.-3 to 170.times.10.sup.-3 mol of effective lithium which is capable of electrochemical occlusion and release upon charging and discharging per g of the polyaniline used as the positive electrode active material, and said electrolytic solution is an non-aqueous electrolytic solution containing an electrolyte of more than 1 mol/l to less than 6 mol/l in a non-aqueous solvent.
    Type: Grant
    Filed: October 17, 1986
    Date of Patent: January 5, 1988
    Assignee: Bridgestone Corporation
    Inventors: Hideharu Daifuku, Tadashi Fuse, Masao Ogawa, Yoshitomo Masuda, Shinichi Toyosawa, Ryota Fujio
  • Patent number: 4461796
    Abstract: A sound damping material is disclosed, which is a composite structural body comprising honeycomb or corrugated core, plain sheet and pressure sensitive adhesive layer, a height direction of the honeycomb or corrugated core being perpendicular to a surface of a vibrating body. In this sound damping material, one pressure sensitive adhesive layer is at least existent between the honeycomb or corrugated cores or between the honeycomb or corrugated core and the plain sheet.
    Type: Grant
    Filed: July 5, 1983
    Date of Patent: July 24, 1984
    Assignee: Bridgestone Tire Company Limited
    Inventors: Yoshihide Fukahori, Yasuhiro Morimura, Ryota Fujio, Yukio Fukuura
  • Patent number: 4169599
    Abstract: Two-piece solid golf balls having an improved initial velocity are disclosed. The core is obtained by curing a composition comprising (a) 100 parts by weight of polybutadiene, (b) 9-20 parts by weight of a polyfunctional unsaturated ester, (c) 5-10 parts by weight of methacrylic acid and/or acrylic acid, the total amount of the ingredients (b) and (c) being 15-30 parts by weight and the weight ratio of the ingredient (b)/the ingredient (c) being 55/45-80/20, (d) 20-80 parts by weight of a zinc compound and (e) 0.5-5 parts by weight of an alkyl peroxide. The cover comprises (f) 100 parts by weight of a metal salt of a copolymer of ethylene and unsaturated carboxylic acid, said metal salt having a loss tangent of lower than 0.08, and (g) 1-5 parts by weight of an inorganic filler.
    Type: Grant
    Filed: June 16, 1977
    Date of Patent: October 2, 1979
    Assignee: Bridgestone Tire Company Limited
    Inventors: Ryota Fujio, Motozumi Kitayama, Fumio Odaka, Takashi Nyomura, Shiro Anzai
  • Patent number: 3981943
    Abstract: One shot mouldable and curable homogeneous rubber composition consisting mainly of polyisoprene rubber and a monomer mixture composed of divinylbenzene and .alpha.-methylstyrene in specifically limited weight ratios of the rubber/the monomer mixture and of divinylbenzene/.alpha.-methylstyrene and containing small amounts of organic peroxide and at least one of amine compound and phenol compound. The cured product of the rubber composition has high Young's modulus, tear energy and tensile strength retention. More improved cured rubbers having these physical properties well balanced in a high level can be easily obtained by additionally adding a small amount of sulfur or p-quinonedioxime to the above rubber composition.
    Type: Grant
    Filed: April 15, 1974
    Date of Patent: September 21, 1976
    Assignee: Bridgestone Fire Company Limited
    Inventors: Ryota Fujio, Nobuyuki Kataoka, Yoshihide Fukabori, Shiro Anzai
  • Patent number: 3931097
    Abstract: An ethylene-propylene copolymer rubber composition having a high Young's modulus, which comprises 100 parts by weight of a mixture of the following ingredients (a) and (b) in a weight ratio of ingredient (a)/ingredient (b) of 67/33-50/50, said ingredient (a) being an ethylene-propylene copolymer having a Mooney viscosity of at least 75, said ingredient (b) being divinylbenzene, (c) 0.3-2.5 parts by weight of an organic peroxide, and (d) 0.01-0.25 part by weight of sulfur, and the homogeneous rubber composition cured at 120.degree.-180.degree.C having a Young's modulus of 200-500 Kg/cm.sup.2, a tensile strength of at least 200 Kg/cm.sup.2, an elongation of at least 300%, a tear energy of at least 10 Kg/cm and retentions of Young's modulus and tensile strength at 70.degree.C of at least 50%.
    Type: Grant
    Filed: December 4, 1974
    Date of Patent: January 6, 1976
    Assignee: Bridgestone Tire Company Limited
    Inventors: Ryota Fujio, Nobuyuki Kataoka, Motozumi Kitayama, Yoshihide Fukabori, Shiro Anzai