Patents by Inventor Yuusaku Arima

Yuusaku Arima 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 hydrotreating heavy hydrocarbon oils
    Patent number: 4613425
    Abstract: A two-stage process for hydrotreating asphaltenes and metallic contaminants-containing heavy hydrocarbon oils which comprises a demetallization step using a catalyst composition which is smaller in pore size and less in active metal amount than the conventional demetallization catalysts, and a hydrotreating step using a catalyst composition which is larger in pore size and more in active metal amount than the conventional hydrodesulfurization catalysts or hydrocracking catalysts, said hydrotreating step being located downstream of said demetallization step.
    Type: Grant
    Filed: January 19, 1984
    Date of Patent: September 23, 1986
    Assignee: Catalysts & Chemicals Industries Co., Ltd.
    Inventors: Hidehiro Higashi, Katsuhiro Shirono, Yuusaku Arima, Yoichi Nishimura, Shinichi Yoshida