Patents by Inventor Keiichi Ideda

Keiichi Ideda 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 of N-substituted maleimides by use of tin catalysts
    Patent number: 5068357
    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 aproptic polar solvent, in the presence as catalyst of metallic tin, tin oxide, a tin salt of a maleamic acid or a tin compound which forms a thin salt of the N-substituted maleamic acid in the reaction system.
    Type: Grant
    Filed: June 11, 1990
    Date of Patent: November 26, 1991
    Assignee: Mitsui Toatsu Chemicals, Inc.
    Inventors: Ryuichiro Tsumura, Teruo Muraishi, Keiichi Ideda, Jin-Kai Wang