Patents by Inventor Kohei Okumura

Kohei Okumura 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).

  • Methacrylic resin and process for producing thererof
    Patent number: 7964690
    Abstract: A methacrylic resin comprising 80 to 98.5 wt % of methyl methacrylate monomer unit and 1.5 to 20 wt % of at least one different vinyl monomer unit copolymerizable with methyl methacrylate, characterized in that the methacrylic resin has a weight average molecular weight measured by gel permeation chromatography (GPC) of 60,000 to 230,000 and comprises 7 to 30% of a component having a weight average molecular weight of ? or less of a peak weight average molecular weight (Mp) obtained from a GPC elution curve based on the methacrylic resin component.
    Type: Grant
    Filed: November 17, 2006
    Date of Patent: June 21, 2011
    Assignee: Asahi Kasei Chemicals Corporation
    Inventors: Naoki Azuma, Kohei Okumura, Kazunori Kozawa
  • Methacrylic Resin and Process for Producing Thererof
    Publication number: 20090239050
    Abstract: A methacrylic resin comprising 80 to 98.5 wt % of methyl methacrylate monomer unit and 1.5 to 20 wt % of at least one different vinyl monomer unit copolymerizable with methyl methacrylate, characterized in that the methacrylic resin has a weight average molecular weight measured by gel permeation chromatography (GPC) of 60,000 to 230,000 and comprises 7 to 30% of a component having a weight average molecular weight of ? or less of a peak weight average molecular weight (Mp) obtained from a GPC elution curve based on the methacrylic resin component.
    Type: Application
    Filed: November 17, 2006
    Publication date: September 24, 2009
    Applicant: Asahi Kasei Chemicals Corporation
    Inventors: Naoki Azuma, Kohei Okumura, Kazunori Kozawa