Patents by Inventor Seigo Iwamoto

Seigo Iwamoto 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).

  • Agent for improving chroma and brightness of pigments
    Patent number: 4368161
    Abstract: The present invention relates to the product from the reaction of a basic polyaluminum or aluminum salt with an amino acid-based anionic surfactant. This agent is espectially effective for improving the chroma and brightness of pigments, even when such pigment is treated with the polyaluminum salt by mixing. In addition to this, the polyaluminum salt increases the lipophilic properties of the pigment, which improves their oil-dispersability and also prevents bleeding of the pigments.
    Type: Grant
    Filed: April 10, 1981
    Date of Patent: January 11, 1983
    Assignees: Nihonshikizai Kogyo Co., Ltd., Takeda Chemical Industries, Ltd.
    Inventors: Seigo Iwamoto, Eiichi Saito
  • Agent of chroma and brightness for pigments
    Patent number: 4327017
    Abstract: The present invention relates to the product from the reaction of a basic polyaluminum or aluminum salt with a resin acid or its salt; said resin acid being derived from a rosin or a modified rosin. This agent is especially effective for improving the chroma and brightness of pigments when such pigment is treated with the polyaluminum salt by e.g. mixing. In addition to this, the polyaluminum salt increases the lipophilic properties of the pigments, which improves their oil-dispersability and also the pigments treated with the polyaluminum salt are essentially free from bleeding.
    Type: Grant
    Filed: March 6, 1980
    Date of Patent: April 27, 1982
    Assignees: Nihonshikizai Kogyo Co., Ltd., Takeda Chemical Industries, Ltd.
    Inventors: Seigo Iwamoto, Eiichi Saito