Patents by Inventor Shigeru Nishikida

Shigeru Nishikida 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).

  • Method of recovering boron trifluoride complex and process for producing olefin oligomer using the same
    Patent number: 6084144
    Abstract: A boron trifluoride complex can be recovered without changing its molar coordination ratio, by applying a direct and/or alternating voltage to an electrically-nonconductive fluid in which at least a part of boron trifluoride complex is dispersed and/or dissolved, and separating the boron trifluoride complex by settling from the electrically-nonconductive fluid. By utilizing this method for the preparation of olefin oligomer using a boron trifluoride complex catalyst, it is possible to reuse the recovered catalyst as it stands for the reaction.
    Type: Grant
    Filed: October 15, 1998
    Date of Patent: July 4, 2000
    Assignee: Nippon Petrochemicals Company, Limited
    Inventors: Tsutomu Takashima, Yoshisuke Kakuyama, Shigeru Nishikida, Yuichi Tokumoto, Kouji Fujimura