Patents by Inventor Masaki Hashizume

Masaki Hashizume 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).

  • Tetracyclododecene compositions and process for producing the same
    Patent number: 6512152
    Abstract: The present invention is drawn to a tetracyclododecene composition having a regulated cyclopentadiene trimer content, whereby addition polymerization with the aid of a Ziegler catalyst can be carried out while preventing gelation caused by a cross-linking reaction. A tetracyclododecene composition regulated with respect to the content of a specific ingredient having a molecular weight of 188 is disclosed, whereby polymers having high glass transition temperatures can be obtained through various polymerizations. Further, the present invention is drawn to a method for producing tetracyclododecene in the presence of an aliphatic solvent having a boiling point close to that of norbornene, which solvent is effective in inhibiting the recovered norbornene from solidifying.
    Type: Grant
    Filed: February 28, 2000
    Date of Patent: January 28, 2003
    Assignee: Nippon Petrochemicals Company, Limited
    Inventors: Masaki Hashizume, Tomonobu Uchida, Fuyuki Aida, Takashi Suzuki, Yoshihisa Inomata, Yasuo Matsumura