Patents by Inventor Kazuya Oharu

Kazuya Oharu 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: 5648325
    Abstract: An azeotropic composition consisting of 89.2 wt % of 1,1,1,2,2,3,3,4,4,5,5,6,6-tridecafluorohexane and 10.8 wt % of methanol and an azeotropic composition consisting of 91.1 wt % of 1,1,1,2,2,3,3,4,4,5,5,6,6-tridecafluorohexane and 8.9 wt % of ethanol.The present invention provides alternative azeotropic solvent compositions which have excellent properties of conventional 1,1,2-trichloro-l,2,2-trifluoroethane and do not deplete the stratospheric ozone layer.
    Type: Grant
    Filed: June 9, 1995
    Date of Patent: July 15, 1997
    Assignee: AG Technology Co., Ltd.
    Inventors: Kenroh Kitamura, Michino Ikehata, Masaaki Tsuzaki, Kazuya Oharu
  • Patent number: 5648568
    Abstract: A method for producing a hydrofluorocarbon of the formula H.sub.n R.sub.f H wherein n is 0 or 1, and when n is 0, R.sub.f is a C.sub.2-12 linear or branched polyfluoroalkyl group, and when n is 1, R.sub.f is a C.sub.2-12 linear or branched polyfluoroalkylene group, which comprises reacting an iodofluorocarbon of the formula I.sub.n R.sub.f I wherein n and R.sub.f are as defined above, with hydrogen at a temperature of not higher than 450.degree. C. in a gas phase.
    Type: Grant
    Filed: June 5, 1995
    Date of Patent: July 15, 1997
    Assignee: Asahi Glass Company Ltd.
    Inventors: Kazuya Oharu, Ryuji Seki, Seisaku Kumai
  • Patent number: 5618986
    Abstract: A method for producing a hydrofluorocarbon of the formula a H.sub.n R.sub.f H wherein n is 0 or 1, and when n is 0, R.sub.f is a C.sub.2-12 linear or branched polyfluoroalkyl group, and when n is 1, R.sub.f is a C.sub.2-12 linear or branched polyfluoroalkylene group, which comprises reacting an iodofluorocarbon of the formula I.sub.n R.sub.f I wherein n and R.sub.f are as defined above, with an alkali metal hydroxide under action of an alcohol mixture comprising a primary alcohol and a secondary alcohol.
    Type: Grant
    Filed: May 3, 1996
    Date of Patent: April 8, 1997
    Assignee: Asahi Glass Company Ltd.
    Inventors: Kazuya Oharu, Ryuji Seki, Seisaku Kumai
  • Patent number: 5557017
    Abstract: A method for producing a hydrofluorocarbon of the formula a H.sub.n R.sub.f H wherein n is 0 or 1, and when n is 0, R.sub.f is a C.sub.2-12 linear or branched polyfluoroalkyl group, and when n is 1, R.sub.f is a C.sub.2-12 linear or branched polyfluoroalkylene group, which comprises reacting an iodofluorocarbon of the formula I.sub.n R.sub.f I wherein n and R.sub.f are as defined above, with an alkali metal hydroxide under action of an alcohol mixture comprising a primary alcohol and a secondary alcohol.
    Type: Grant
    Filed: October 5, 1994
    Date of Patent: September 17, 1996
    Assignee: Asahi Glass Company Ltd.
    Inventors: Kazuya Oharu, Ryuji Seki, Seisaku Kumai
  • Patent number: 5268411
    Abstract: A fluorine-containing polymer composition comprising a solvent containing a block compound composed of a polyfluorinated segment and a hydrocarbon segment and a fluorine-containing polymer having a fluorine-containing aliphatic cyclic structure dissolved in the solvent.
    Type: Grant
    Filed: February 17, 1993
    Date of Patent: December 7, 1993
    Assignee: Asahi Glass Company Ltd.
    Inventors: Shunsuke Yokotsuka, Isamu Kaneko, Kazuya Oharu
  • Patent number: 4910276
    Abstract: A method for cyclic polymerization, wherein a fluorine-containing monomer is subjected to cyclic polymerization, the fluorine-containing monomer having two carbon-carbon multiple bonds, each having different polymerizability, as linked by a linking chain having a straight chain portion to from 2 to 7 atoms, and having a fluorine content of at least 10% by weight.
    Type: Grant
    Filed: August 10, 1988
    Date of Patent: March 20, 1990
    Assignee: Asahi Glass Company, Ltd.
    Inventors: Masaru Nakamura, Isamu Kaneko, Kazuya Oharu, Gen Kojima, Masashi Matsuo, Shunichi Samejima, Motoi Kamba
  • Patent number: 4897457
    Abstract: A fluorine-containing thermoplastic resinous polymer which consist essentially of a group (a) of repeating units of a cyclic structure to be represented by the following general formula: ##STR1## (where: n is an integer of 1 to 2); the polymer having a molecular weight such that the intrinsic viscosity thereof may become at least 0.1.A fluorine-containing thermoplastic resinous polymer which consists essentially of:(i) a group (a) of repeating units to be represented by the following general formula: ##STR2## (where: n is an integer of 1 or 2), and (ii) a group (b) of repeating units to be represented by the following general formula:--CF.sub.2 --CFX)--(where: X is selected from fluorine, chlorine. O--CF.sub.2 CF.sub.2 CF.sub.3, O--CF.sub.2 CF(CF.sub.3)OCF.sub.2 CF.sub.2 SO.sub.2 F, and O--CF.sub.2 CF.sub.2 CF.sub.2 COOCH.sub.
    Type: Grant
    Filed: August 10, 1988
    Date of Patent: January 30, 1990
    Assignee: Asahi Glass Company Ltd.
    Inventors: Masaru Nakamura, Isamu Kaneko, Kazuya Oharu, Gen Kojima, Masashi Matsuo, Shunichi Samejima, Motoi Kamba
  • Patent number: 4859754
    Abstract: A water and oil repellant having desoiling properties composed of a polyfluorinated group-containing copolymer obtained by copolymerizing the following monomers a and b as essential constituting components:a: a polyfluorinated group-containing monomerb: an amphipathic monomer having a hydrophilic moiety and a lipophilic moiety.
    Type: Grant
    Filed: October 20, 1988
    Date of Patent: August 22, 1989
    Assignee: Asahi Glass Company, Ltd.
    Inventors: Takashige Maekawa, Kazuya Oharu, Tomoko Sakaguchi