Patents by Inventor Mitsumoto Murayama

Mitsumoto Murayama 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).

  • Material for electrical insulating organic film, electrical insulating organic film and process for the preparation thereof
    Patent number: 6380271
    Abstract: The present invention provides a material for electrical insulating organic film, superior in electrical properties, thermal properties and low water absorption; an electrical insulating organic film made from the material; and a process for production of the film. That is, the present invention provides an electrical insulating organic film having fine pores, consisting of a layer of a polybenzoxazole resin represented by the following general formula (1): wherein n is an integer of 2 to 1,000; X is a tetravalent organic group; and Y is a bivalent organic group; a material for electrical insulating organic film obtained by mixing a polybenzoxazole precursor or a polybenzoxazole resin, with an oligomer; and a material for electrical insulating organic film, obtained by reacting at least one carboxylic acid terminal of a polybenzoxazole precursor with an amino group- or hydroxyl group-containing oligomer.
    Type: Grant
    Filed: June 27, 2000
    Date of Patent: April 30, 2002
    Assignee: Sumitomo Bakelite Company Limited
    Inventors: Takashi Enoki, Takashi Yamaji, Mitsumoto Murayama, Yoko Hase, Toshimasa Eguchi
  • Polybenzoxazole resin and precursor thereof
    Patent number: 6297351
    Abstract: A polybenzoxazole precursor having recurring units represented by the following general formula (1) and a polybenzoxazole resin having a structure obtained by cyclizing the polybenzoxazole precursor: wherein n denotes an integer of 1-1000, and (i) when X is selected from bivalent aromatic groups represented by the general formulas (2)-(4) defined in the specification each having two OR groups (Rs each denotes H or a monovalent organic group and may be the same or different), and the amide group in the formula (1) and the OR group respectively bond to the adjacent carbon atoms of the aromatic group, Y denotes a bivalent organic group containing fluorine; and (ii) when Y is selected from bivalent aromatic groups represented by the general formulas (5)-(7) defined in the specification, X denotes a bivalent aromatic group containing fluorine and having two OR groups (Rs each denotes H or a monovalent organic group and may be the same or different), and the amide group in the formula (1) and the
    Type: Grant
    Filed: December 16, 1999
    Date of Patent: October 2, 2001
    Assignee: Sumitomo Bakelite Company Limited
    Inventors: Mitsumoto Murayama, Toshimasa Egucih, Takashi Yamaji, Takuya Hatao, Nobuhiro Higashida, Yoko Mizumoto
  • Polybenzoxazole resin and precursor thereof
    Patent number: 6114497
    Abstract: Polybenzoxazole precursors are used to prepare resins with good electrical characteristics and thermal characteristics as well as low water absorption.
    Type: Grant
    Filed: October 26, 1999
    Date of Patent: September 5, 2000
    Assignee: Sumitomo Bakelite Company Limited
    Inventors: Masahiro Tada, Mitsumoto Murayama, Takuya Hatao, Takashi Yamaji