Patents Assigned to Unique Chemical Consultant, Ltd.
  • Method for lightening petroleum hydrocarbon oil by distillation
    Patent number: 4931170
    Abstract: A method for lightening a petroleum hydrocarbon oil by distillation in which 1 part by weight or less of an organic compound having an active mercapto group therein is added to 100 parts by weight of the petroleum hydrocarbon oil when the petroleum hydrocarbon oil is lightened by a thermal treatment.
    Type: Grant
    Filed: June 22, 1988
    Date of Patent: June 5, 1990
    Assignees: Seibu Oil Co., Ltd., Unique Chemical Consultant, Ltd.
    Inventor: Tadashi Sasaki