Patents by Inventor Masashi Yamanashi

Masashi Yamanashi 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).

  • Tetracarboxylic acid compound, polyimide thereof, and production method thereof
    Patent number: 7795370
    Abstract: A tetracarboxylic acid compound of formula (1) or (2) wherein A represents a divalent group; X1, X2 and X3 respectively represent a hydrogen atom or the like; R1, R2, R3 and R4 respectively represent a carboxyl group or an acid anhydride group; n represents 1 or 2; and B represents a cyclic group.
    Type: Grant
    Filed: November 14, 2006
    Date of Patent: September 14, 2010
    Assignee: Mitsubishi Chemical Corporation
    Inventors: Haruhiko Kusaka, Yuji Ohgomori, Masashi Yamanashi
  • TETRACARBOXYLIC ACID COMPOUND, POLYIMIDE THEREOF, AND PRODUCTION METHOD THEREOF
    Publication number: 20090182114
    Abstract: Disclosed is a novel tetracarboxylic acid compound having excellent characteristics such as high transparency, low dielectric property, low water absorption, low thermal expansion, solvent solubility and etching characteristics, while exhibiting high heat resistance at the same time. This tetracarboxylic acid compound is useful as a raw material monomer for producing a polyesterimide or a polyamideimide. Specifically disclosed is a tetracarboxylic acid compound represented by the general formula (1) or (2) below. In the formulae, A represents a divalent group; X1, X2 and X3 respectively represent a hydrogen atom or the like; R1, R2, R3 and R4 respectively represent a carboxyl group or an acid anhydride group; n represents 1 or 2; and ring B represents a cyclic group.
    Type: Application
    Filed: November 14, 2006
    Publication date: July 16, 2009
    Inventors: Haruhiko Kusaka, Yuji Ohgomori, Masashi Yamanashi