Patents by Inventor Yoshifumi Hama

Yoshifumi Hama 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).

  • Method of injection molding a reinforced article
    Patent number: 5102605
    Abstract: A method of making a molded article by injecting into a mold filled with reinforcing material a resin composition including (a) 40 to 80% by weight of a resin including an oligomer having a number average molecular weight of 900 to 3,000 in terms of polystyrene equivalent obtained by gel permeation chromatography and having two or more terminal (meth)acrylate groups and an unsaturated polyester, and (b) 20 to 60% by weight of methyl (meth)acrylate monomer.
    Type: Grant
    Filed: August 21, 1991
    Date of Patent: April 7, 1992
    Assignee: Dainippon Ink and Chemicals, Inc.
    Inventors: Katsuo Kagaya, Yoshifumi Hama, Shichinosuke Ito
  • Resin composition
    Patent number: 5084508
    Abstract: A resin composition comprising(a) 40 to 80% by weight of a resin comprisingan oligomer having a number average molecular weight of 900 to 3,000 in terms of polystyrene equivalent obtained by gel permeation chromatography and having two or more terminal (meth)acrylate groups andan unsaturated polyester, and(b) 20 to 60% by weight of methyl (meth)acrylate monomer.
    Type: Grant
    Filed: April 28, 1989
    Date of Patent: January 28, 1992
    Assignee: Dainippon Ink & Chemicals, Inc.
    Inventors: Katsuo Kagaya, Yoshifumi Hama, Shichinosuke Ito