Patents by Inventor Masanori Oiwa

Masanori Oiwa 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).

  • Production of polymer microparticles having water-insoluble chemicals immobilized therein
    Patent number: 5302654
    Abstract: Polymer microparticles having immobilized therein a water-insoluble substance such as oil-soluble dyes or pigments are produced by a method which includes the steps of forming droplets of a solution of a self-emulsifiable resin in a nonaqueous solvent containing the water-insoluble substance and an ethylenically unsaturated monomer suspended in an aqueous medium, and then allowing the monomer in the droplets to polymerize in situ.
    Type: Grant
    Filed: March 2, 1993
    Date of Patent: April 12, 1994
    Assignee: Nippon Paint Co., Ltd.
    Inventors: Keizo Ishii, Hidetsumu Okada, Masanori Oiwa, Hisaichi Muramoto, Shinichi Ishikura