Patents by Inventor Seitaro Iwamoto

Seitaro 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).

  • Powder epoxy resin coating composition
    Patent number: 5418265
    Abstract: A powder coating composition useful for fixation of rotor and stator windings is disclosed, which includes100 parts by weight of an epoxy resin;5-35 parts by weight of an acid anhydride;2-30 parts by weight of a phenol resin;0.05-5 parts by weight of a curing accelerator; and130-270 parts by weight of an inorganic filler consisting of 99.7-87.0% by weight of a first filler component having an average particle size of 0.5-100 .mu.m and 0.3-13.0% by weight of a second filler component having an average particle size of 0.1 .mu.m or less.
    Type: Grant
    Filed: December 21, 1993
    Date of Patent: May 23, 1995
    Assignee: Somar Corporation
    Inventors: Kunimitsu Matsuzaki, Kazuya Ono, Seitaro Iwamoto, Mikio Osa, Takeshi Watanabe
  • Epoxy powder coating composition for use in electrostatic coating
    Patent number: 5319002
    Abstract: A powder coating composition is disclosed which includes a particulate material containing an epoxy resin and a curing agent, and fine powder of a charge controlling agent such as an acrylic resin, silica or a mixture thereof. The charge controlling agent is deposited on surfaces of the particles of the particulate material.
    Type: Grant
    Filed: October 14, 1992
    Date of Patent: June 7, 1994
    Assignee: Somar Corporation
    Inventors: Kunimitsu Matsuzaki, Seitaro Iwamoto, Takeshi Watanabe, Kazuya Ono, Katsuji Kitagawa
  • Epoxy powder coating composition for use in electrostatic coating
    Patent number: 5204387
    Abstract: A powder coating composition is disclosed which includes a particulate material containing an epoxy resin and a curing agent, and fine powder of a charge controlling agent such as an acrylic resin, silica or a mixture thereof. The charge controlling agent is deposited on surfaces of the particles of the particulate material. Additionally, a powder coating composition is disclosed in which two different charge controlling agents are used and are separately deposited on different particles of epoxy resin consisting particulate material.
    Type: Grant
    Filed: December 20, 1991
    Date of Patent: April 20, 1993
    Assignee: Somar Corporation
    Inventors: Kunimitsu Matsuzaki, Seitaro Iwamoto, Takeshi Watanabe, Kazuya Ono, Katsuji Kitagawa
  • Composite material having an expanded, cured epoxy resin layer, method of producing same and powder epoxy resin composition for forming such an expanded layer
    Patent number: 5196261
    Abstract: A composite material having a substrate and an expanded, cured layer of an epoxy resin composition which is provided over a surface of the substrate and in which a major portion of the cells are present in a location adjacent to the interface between the substrate and the expanded layer and substantially no cells are present on the top surface portion of the expanded layer. The epoxy resin composition includes an acid anhydride curing agent and an alkali metal carbonate blowing agent. The composition is coated over the substrate and the coating is heated to sure and expand the composition while maintaining the top surface of the coating below the expansion temperature.
    Type: Grant
    Filed: July 27, 1992
    Date of Patent: March 23, 1993
    Assignee: Somar Corporation
    Inventors: Kazuya Ono, Katsuji Kitagawa, Seitaro Iwamoto, Mikio Osa, Takeshi Watanabe