Patents by Inventor Yoko Mizumoto

Yoko Mizumoto 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).

  • 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