Patents by Inventor Kunimitsu Fukumura

Kunimitsu Fukumura 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).

  • Preparation process of N-substituted maleimides
    Patent number: 5175309
    Abstract: A process for the preparation of N-substituted maleimides by conducting heat-dehydration and dehydrating imidization of N-substituted maleamic acids under azeotropic distillation of generated water in a solvent mixture containing a solvent capable of forming water azeotrope and an organic aprotic polar solvent, in the presence as catalyst of a zinc salt of a maleamic acid, metallic zinc or a zinc compound which forms a zinc salt of the N-substituted maleamic acid in the reaction system.
    Type: Grant
    Filed: December 8, 1989
    Date of Patent: December 29, 1992
    Assignee: Mitsui Toatsu Chemicals Inc.
    Inventors: Ryuichiro Tsumura, Kunimitsu Fukumura, Teruo Muraishi
  • Process for removing oil particles from waste water containing the same
    Patent number: 4202766
    Abstract: A process for the separation of oil from waste water containing the same in the form of fine particles, comprising introducing a hydroxide or oxide of calcium or a mixture thereof into the waste water for adsorbing the oil on the hydroxide or oxide and/or coagulating the oil, adding an acid or an alkali to the waste water for dissolving the oil-adsorbing hydroxide or oxide to liberate the oil, and separating the liberated oil from the waste water.
    Type: Grant
    Filed: June 22, 1978
    Date of Patent: May 13, 1980
    Inventors: Hiroshi Ono, Toyoyasu Saida, Kunimitsu Fukumura