Patents by Inventor Shigetoshi Yamaki

Shigetoshi Yamaki 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 separating para-dichlorobenzene from isomeric mixture of dichlorobenzenes
    Patent number: 4762955
    Abstract: Disclosed herein is a process for separating p-dichlorobenzene from an isomeric mixture of dichlorobenzenes comprising adding 1-bromo-4-chlorobenzene, 1,4-dibromobenzene or a mixture of 1-bromo-4-chlorobenzene and 1,4-dibromobenzene to the isomeric mixture of dichlorobenzenes, heating the thus formed mixture to dissolve a part or the whole thereof, cooling the thus treated material, thereby crystallizing the eutictic crystals of p-dichlorobenzene and 1-bromo-4-chlorobenzene or 1,4-dibromobenzene or the eutectic crystals of p-dichlorobenzene, 1-bromo-4-chlorobenzene and 1,4-dibromobenzene, and thus separating p-dichlorobenzene from the isomeric mixture of dichlorobenzenes.
    Type: Grant
    Filed: May 15, 1986
    Date of Patent: August 9, 1988
    Assignee: Kureha Kagaku Kogyo Kabushiki Kaisha
    Inventor: Shigetoshi Yamaki