Patents by Inventor Hiromi Nakaoka

Hiromi Nakaoka 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 preparation of high-purity indene
    Patent number: 6291735
    Abstract: A process is provided for the preparation of high-purity indene. According to the process, impurities are eliminated by crystallization from an indene stock which is available in a concentrated form by distillation of a coal tar fraction and/or a petroleum fraction. High-purity indene having a purity of 99 wt. % or higher can be obtained.
    Type: Grant
    Filed: September 17, 1999
    Date of Patent: September 18, 2001
    Assignee: ADCHEMCO Corporation
    Inventors: Yasuyuki Takigawa, Hiromi Nakaoka