Patents by Inventor Ohshima Koji

Ohshima Koji 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).

  • Process for the preparation of siloxane copolymers and resin compositions containing the siloxane copolymers prepared by the process
    Patent number: 6407193
    Abstract: This invention relates to a process of producing a siloxane copolymer comprising the step of reacting at least one diol, at least one dicarbonate and at least one silicon compound as copolymerization components in the presence of an esterification or transesterification catalyst, wherein the silicon compound is represented by the general formulas (I) and (II): wherein R1, R2, R3 and R4 are each independently a hydrogen atom or a substituted or non-substituted organic group; X and Y are each independently a hydrogen atom or a substituted or non-substituted organic group; a represents an integer of 0 to 5,000; and b represents an integer of 3 to 20.
    Type: Grant
    Filed: July 30, 1998
    Date of Patent: June 18, 2002
    Assignee: Kaneka Corporation
    Inventors: Tomoki Hiiro, Ohshima Koji, Aoyama Taizo