Patents by Inventor Hiroto Yonekura

Hiroto Yonekura 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).

  • Phosphating process of metal surface
    Patent number: 4419147
    Abstract: A process for phosphating a metal surface to be electrocoated, which comprises treating the metal surface with an acidic phosphating solution comprising a zinc compound in a concentration of 0.5 to 1.5 g/l as zinc ion, a phosphate in a concentration of 5 to 30 g/l as phosphate ion and a nitrite in a concentration of 0.01 to 0.2 g/l as nitrite ion and/or an aromatic nitro compound in a concentration of 0.05 to 2 g/l in water at a temperature of 40 to 70.degree. C. first by dipping for not less than 15 seconds and then by spraying for not less than 2 seconds.
    Type: Grant
    Filed: April 6, 1981
    Date of Patent: December 6, 1983
    Assignee: Amchem Products, Inc.
    Inventors: Ryoichi Murakami, Hideo Shimizu, Takashi Yoshii, Minoru Ishida, Hiroto Yonekura
  • Phosphating process of metal surface
    Patent number: 4292096
    Abstract: A process for phosphating a metal surface to be electrocoated, which comprises treating the metal surface with an acidic phosphating solution comprising a zinc compound in a concentration of 0.5 to 1.5 g/l as zinc ion, a phosphate in a concentration of 5 to 30 g/l as phosphate ion and a nitrite in a concentration of 0.01 to 0.2 g/l as nitrite ion and/or an aromatic nitro compound in a concentration of 0.05 to 2 g/l in water at a temperature of 40 to 70.degree. C. first by dipping for not less than 15 seconds and then by spraying for not less than 2 seconds.
    Type: Grant
    Filed: February 13, 1980
    Date of Patent: September 29, 1981
    Assignee: Nippon Paint Co., Ltd.
    Inventors: Ryoichi Murakami, Hideo Shimizu, Takashi Yoshii, Minoru Ishida, Hiroto Yonekura