Patents by Inventor Hayao Yoshioka

Hayao Yoshioka 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 producing 1,3-butadiene
    Patent number: 4504692
    Abstract: A process for producing 1,3-butadiene which comprises feeding a fraction comprising C.sub.4 -paraffins and C.sub.4 -olefins as the main components and being free from isobutene, 1,3-butadiene and C.sub.4 -acetylenes to a dehydrogenation or oxidative dehydrogenation step (step A), where the n-butenes contained therein is converted to 1,3-butadiene; feeding the 1,3-butadiene-containing hydrocarbon fraction thus obtained (fraction C) to an extractive distillation column (column B), in which said fraction C is distilled in an atmosphere of a selective solvent while obtaining a fraction comprising C.sub.
    Type: Grant
    Filed: March 9, 1984
    Date of Patent: March 12, 1985
    Assignee: Japan Synthetic Rubber Co., Ltd.
    Inventors: Masatoshi Arakawa, Hayao Yoshioka, Kazuyoshi Nakazawa