Patents by Inventor Yoshiko Ueda, heiress

Yoshiko Ueda, heiress 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).

  • Stabilized polyphenylene ether resin and process for the preparation of the same
    Patent number: RE35695
    Abstract: Disclosed is a stabilized polyphenylene ether resin which comprises a plurality of polyphenylene ether chains, which chains collectively contain terminal 6-chroman groups in an amount of at least 0.01 in terms of the number of the terminal 6-chroman groups per 100 polyphenylene ether units in the resin. This polyphenylene ether resin has excellent resistance to thermal oxidation. A composition comprising this stabilized polyphenylene ether resin and a polystyrene resin has not only high resistance to thermal oxidation but also excellent moldability.
    Type: Grant
    Filed: October 26, 1994
    Date of Patent: December 16, 1997
    Assignee: Asahi Kasei Kogyo Kabushiki Kaisha
    Inventors: Akihiro Kanayama, Sumio Ueda, deceased, Yoshiko Ueda, heiress, Sadao Ibe