Patents by Inventor Yasuhiro Ishikawa

Yasuhiro Ishikawa 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).

  • Patent number: 8119228
    Abstract: Disclosed are a polycarbonate resin composition obtained by blending a specific amount of an acrylic resin (B) having a specific viscosity average molecular weight or a specific amount of a polyorganosiloxane into a polycarbonate resin containing a polycarbonate copolymer (A) having repeating structural units represented by the general formulae (I) and (II) below and an optical molded body using the resin composition such as a light guide member. The polycarbonate resin composition enables to obtain a molded body having good light conductivity and being free from yellowing due to thermal deterioration, even when it is molded into a large-sized light guide member or light guide plate.
    Type: Grant
    Filed: April 23, 2007
    Date of Patent: February 21, 2012
    Assignee: Idemitsu Kosan Co., Ltd.
    Inventor: Yasuhiro Ishikawa
  • Patent number: 8080606
    Abstract: A polycarbonate resin composition, which exhibits not only an excellent balance among fluidity, rigidity, heat resistance, and impact resistance while maintaining flame retardance but also an excellent performance of recycling efficiency and a molded article thereof are provided. The polycarbonate resin composition contains a resin mixture of component (A) which is composed of (A-1) 10 to 100 mass % of an aromatic polycarbonate resin wherein dihydroxybiphenyl is used in a part of a divalent phenol as the raw material thereof and (A-2) 90 to 0 mass % of an aromatic polycarbonate resin other than the aromatic polycarbonate resin of component (A-1), and an amorphous styrene resin (B), in a mass ratio of component (A) to component (B) of 50:50 to 95:5. The molded article is an injection-molded article made of the polycarbonate resin composition.
    Type: Grant
    Filed: March 8, 2005
    Date of Patent: December 20, 2011
    Assignee: Idemitsu Kosan Co., Ltd.
    Inventors: Toshio Isozaki, Yoshio Ikeda, Yasuhiro Ishikawa
  • Publication number: 20110022022
    Abstract: There is provided a multi-chamber bag that is capable of securely checking a medicinal substance accommodated therein without the necessity to perform a troublesome work, while preventing a matter deteriorating the medicinal substance from reaching the inside of a medicinal-substance accommodation chamber and hence securely preventing the deterioration of the medicinal substance. In a multi-chamber bag having a bag body that has a strong seal part that joins two sheet members together to define an interior space of the bag body, and a weak seal part that joints the two sheet members together so as to be able to rupture them apart, thereby partitioning the interior space of the bag body into a medicinal-substance accommodation chamber and a diluting-solution accommodation chamber, a pair of cover sheets are provided to respectively cover the medicinal-substance accommodation chamber.
    Type: Application
    Filed: July 16, 2008
    Publication date: January 27, 2011
    Inventors: Tatsuro Tsuruoka, Yasuhiro Ishikawa
  • Patent number: 7820778
    Abstract: Disclosed is a light guide member which includes a polycarbonate copolymer having a repeating unit represented by the formula (I) and a repeating unit represented by the formula (II), which is thin, and which is free from thermal degradation (yellowing) or deterioration in properties caused by the generation of a gas, such as a light guide plate formed of a polycarbonate material. Also disclosed is an illumination unit using the light guide member.
    Type: Grant
    Filed: April 23, 2007
    Date of Patent: October 26, 2010
    Assignee: Idemitsu Kosan Co., Ltd.
    Inventor: Yasuhiro Ishikawa
  • Publication number: 20100266234
    Abstract: The present invention relates to an optical control device capable of achieving an accurate match of modulation timing and modulation intensity between optical waves propagating through optical waveguides disposed between a plurality of signal electrodes in an optical control device using an anisotropic dielectric substrate.
    Type: Application
    Filed: March 29, 2010
    Publication date: October 21, 2010
    Applicant: Sumitomo Osaka Cement Co., Ltd.
    Inventors: Yuhki Kinpara, Masayuki Ichioka, Junichiro Ichikawa, Satoshi Oikawa, Yasuhiro Ishikawa
  • Publication number: 20100264855
    Abstract: A light control device with a reduced electric loss is provided which can suppress a phenomenon of electrically reflecting a high-frequency signal even when it employs a dielectric anisotropic substrate. A light control device includes a signal electrode formed on a dielectric anisotropic substrate and ground electrodes disposed with the signal electrode interposed therebetween. Here, the signal electrode includes at least two signal electrode portions disposed in directions in which the dielectric constant of the substrate is different from each other and a curved connecting portion connecting the at least two signal electrode portions. The connecting portion is configured so that the characteristic impedance in parts connected to the at least two signal electrode portions is equal to that of the corresponding signal electrode portion, and the characteristic impedance in the connecting portion between the at least two signal electrode portions continuously varies.
    Type: Application
    Filed: March 29, 2010
    Publication date: October 21, 2010
    Applicant: Sumitomo Osaka Cement Co., Ltd.
    Inventors: Yuhki Kinpara, Masayuki Ichioka, Junichiro Ichikawa, Satoshi Oikawa, Yasuhiro Ishikawa
  • Publication number: 20100247023
    Abstract: An optical waveguide type modulator with a decreased driving voltage and an improved return loss of a driving signal is provided which includes an optical waveguide having a Mach-Zehnder type optical waveguide portion and a signal electrode and a ground electrode modulating an optical wave guided in the optical waveguide. The signal electrode is arranged along at least one of two branched waveguides and Y-branched portions of the Mach-Zehnder type optical waveguide portion and along a part of one Y-branched portion connected to the one branched waveguide. Outside the part of one Y-branched portion, the signal electrode is drawn across a symmetric axis of the Mach-Zehnder type optical waveguide portion with a gap from the one Y-branched portion, and is drawn so as not to extend along the other Y-branched portion connected to the one branched waveguide and so as not to extend across the symmetric axis with a gap from the one branched waveguide.
    Type: Application
    Filed: September 25, 2008
    Publication date: September 30, 2010
    Applicant: Sumitomo Osaka Cement Co., Ltd.
    Inventors: Yasuhiro Ishikawa, Toru Sugamata
  • Patent number: 7767780
    Abstract: The present invention provides a light diffusing polycarbonate resin composition including a polycarbonate resin containing a polycarbonate copolymer which comprises a repeating unit represented by the general formula (I) shown below and a repeating unit represented by the general formula (II) shown below, which has a content of the repeating units of the general formula (II) of 1 to 30% by mass and which has a viscosity value of 30 to 71, and (B) a light diffusing agent compounded therein in an amount of 0.01 to 10 parts by mass per 100 parts by mass of the polycarbonate resin. The light diffusing polycarbonate resin composition and a light diffusing plate thereof show improved fluidity during molding and have excellent heat resistance, dimensional stability, luminance and color tone.
    Type: Grant
    Filed: June 22, 2006
    Date of Patent: August 3, 2010
    Assignee: Idemitsu Kosan Co., Ltd.
    Inventors: Hiroshi Kawato, Masami Kogure, Yoshihiko Horio, Yasuhiro Ishikawa
  • Patent number: 7678875
    Abstract: A method for producing a PC copolymer with improved productivity is provided. The PC copolymer has a specific structure and the method uses a diester diol-containing monomer as a raw material. The polycarbonate copolymer is produced by reacting a diester diol-containing monomer, a divalent phenol, and a carbonate precursor by interfacial polymerization, wherein the diester diol-containing monomer is a product of reaction between a hydroxybenzoic acid or an esterified product thereof and a polyalkylene glycol, wherein the esterification degree of hydroxyl groups of the polyalkylene glycol is 50 to 90 mol %.
    Type: Grant
    Filed: June 30, 2005
    Date of Patent: March 16, 2010
    Assignee: Idemitsu Kosan Co., Ltd.
    Inventors: Koichi Suga, Yasuhiro Ishikawa
  • Patent number: 7662905
    Abstract: A copolycarbonate; a copolycarbonate composition that contains the copolycarbonate and a polycarbonate resin; a polycarbonate base resin composition that contains the copolycarbonate and an acryl base resin; an optical molded article containing the copolycarbonate; a light guide plate containing the copolycarbonate; a lens containing the copolycarbonate; an optical molded article containing the copolycarbonate composition; a light guide plate containing the copolycarbonate composition; a lens containing the copolycarbonate composition; an optical molded article containing the polycarbonate base resin composition; a light guide plate containing the polycarbonate base resin composition; and an optical molded article containing the polycarbonate base resin composition.
    Type: Grant
    Filed: February 21, 2005
    Date of Patent: February 16, 2010
    Assignee: Idemitsu Kosan Co., Ltd.
    Inventors: Yasuhiro Ishikawa, Hiroshi Kawato, Atsushi Sato
  • Publication number: 20090185363
    Abstract: Disclosed are a polycarbonate resin composition obtained by blending a specific amount of an acrylic resin (B) having a specific viscosity average molecular weight or a specific amount of a polyorganosiloxane into a polycarbonate resin containing a polycarbonate copolymer (A) having repeating structural units represented by the general formulae (I) and (II) below and an optical molded body using the resin composition such as a light guide member. The polycarbonate resin composition enables to obtain a molded body having good light conductivity and being free from yellowing due to thermal deterioration, even when it is molded into a large-sized light guide member or light guide plate.
    Type: Application
    Filed: April 23, 2007
    Publication date: July 23, 2009
    Applicant: IDEMITSU KOSAN CO., LTD.
    Inventor: Yasuhiro Ishikawa
  • Publication number: 20090186208
    Abstract: Provided is a light diffusing resin composition, which, when molded into a large-plane light diffusing plate, is free of yellowing due to thermal deterioration, and can exhibit good light diffusing property, and a light diffusing plate using the resin composition. The light diffusing resin composition includes 100 parts by mass of a polycarbonate resin containing a polycarbonate copolymer (A) having repeating structural units represented by formulae (I) and (II) and 0.01 to 10 parts by mass of a light diffusing agent (B).
    Type: Application
    Filed: April 9, 2007
    Publication date: July 23, 2009
    Applicant: Idemitsu Kosan Co., Ltd.
    Inventors: Yasuhiro Ishikawa, Masami Kogure, Hiroshi Kawato
  • Publication number: 20090175052
    Abstract: Disclosed is a light guide member which includes a polycarbonate copolymer having a repeating unit represented by the formula (I) and a repeating unit represented by the formula (II), which is thin, and which is free from thermal degradation (yellowing) or deterioration in properties caused by the generation of a gas, such as a light guide plate formed of a polycarbonate material. Also disclosed is an illumination unit using the light guide member.
    Type: Application
    Filed: April 23, 2007
    Publication date: July 9, 2009
    Applicant: Idemitsu Kosan Co., Ltd
    Inventor: Yasuhiro Ishikawa
  • Patent number: 7553893
    Abstract: A polycarbonate resin composition comprising polycarbonate resin (A) and, blended therewith per 100 parts by mass thereof, 0.001 to 0.1 part by mass of arylphosphine (B) and 0.01 to 1.0 part by mass of alicyclic epoxy compound (C); or a polycarbonate resin composition comprising polycarbonate resin (A) and, blended therewith per 100 parts by mass thereof, 0.001 to 0.1 part by mass of arylphosphine (B), 0.01 to 1.0 part by mass of alicyclic epoxy compound (C) and 0.01 to 1.0 part by mass of acrylic resin (D). The polycarbonate resin composition exhibits excellent optical properties, excelling in resistance to high temperature high humidity, resistance to heat aging (especially high temperature aging), heat resistance and impact resistance, and is suitable for production of optical parts, such as a lens of optical semiconductor device mounted on vehicles which can be used even in especially severe environment. There is further provided an optical part molded from the polycarbonate resin composition.
    Type: Grant
    Filed: October 5, 2004
    Date of Patent: June 30, 2009
    Assignee: Idemitsu Kosan Co., Ltd.
    Inventors: Hiroshi Kawato, Yoshihiko Horio, Yasuhiro Ishikawa
  • Patent number: 7541419
    Abstract: A branched polycarbonate resin prepared from a divalent phenol, a carbonate precursor, a branching agent, and a chain terminating agent is provided, in which the branching agent is composed of a trisphenol compound represented by the general formula (I). The use of the branching agent brings about excellent washability and permits molding which barely suffers from sagging (blow down) of the melt or stringiness thereof and is accompanied with high melt tension and excellent moldability, thus enabling efficient production of good molded products at high productivity.
    Type: Grant
    Filed: May 19, 2005
    Date of Patent: June 2, 2009
    Assignee: Idemitsu Kosan Co., Ltd.
    Inventor: Yasuhiro Ishikawa
  • Patent number: 7541363
    Abstract: Microcrystals of (E)-8-(3,4-dimethoxystyryl)-1,3-diethyl-7-methyl-3,7-dihydro-1H-purine-2,6-dione having an average particle size of less than 50 ?m; microcrystals of (E)-8-(3,4-dimethoxystyryl)-1,3-diethyl-7-methyl-3,7-dihydro-1H-purine-2,6-dione having an average particle size of less than 50 ?m and a crystallinity of 20% or more or the like, which possess excellent solubility, stability, bioavailability, dispersing property in a pharmaceutical formulation; and the like are provided. A solid pharmaceutical formulation which is characterized by comprising the same is also provided.
    Type: Grant
    Filed: May 7, 2004
    Date of Patent: June 2, 2009
    Assignee: Kyowa Hakko Kirin Co., Ltd.
    Inventors: Kazutoshi Kuroda, Noboru Aoki, Toshiro Ochiai, Akihiro Uchida, Yasuhiro Ishikawa, Makoto Kigoshi, Eiji Hayakawa, Kazuki Asanome
  • Publication number: 20090093583
    Abstract: The present invention provides a light diffusing polycarbonate resin composition including a polycarbonate resin containing a polycarbonate copolymer which comprises a repeating unit represented by the general formula (I) shown below and a repeating unit represented by the general formula (II) shown below, which has a content of the repeating units of the general formula (II) of 1 to 30% by mass and which has a viscosity value of 30 to 71, and (B) a light diffusing agent compounded therein in an amount of 0.01 to 10 parts by mass per 100 parts by mass of the polycarbonate resin. The light diffusing polycarbonate resin composition and a light diffusing plate thereof show improved fluidity during molding and have excellent heat resistance, dimensional stability, luminance and color tone.
    Type: Application
    Filed: June 22, 2006
    Publication date: April 9, 2009
    Applicant: Idemitsu Kosan Co., Ltd.
    Inventors: Hiroshi Kawato, Masami Kogure, Yoshihiko Horio, Yasuhiro Ishikawa
  • Patent number: D622375
    Type: Grant
    Filed: January 18, 2008
    Date of Patent: August 24, 2010
    Assignee: Otsuka Pharmaceutical Factory, Inc.
    Inventors: Tatsuro Tsuruoka, Yasuhiro Ishikawa, Yasushi Nagata
  • Patent number: D623734
    Type: Grant
    Filed: January 18, 2008
    Date of Patent: September 14, 2010
    Assignee: Otsuka Pharmaceutical Factory, Inc.
    Inventors: Tatsuro Tsuruoka, Yasuhiro Ishikawa
  • Patent number: D623735
    Type: Grant
    Filed: January 18, 2008
    Date of Patent: September 14, 2010
    Assignee: Otsuka Pharmaceutical Factory, Inc.
    Inventors: Tatsuro Tsuruoka, Yasuhiro Ishikawa