Patents by Inventor Hiroshi Kuboyama

Hiroshi Kuboyama 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).

  • Polyester-based film
    Patent number: 5051475
    Abstract: The present invention is directed to a polyester film comprising at least at its surface portion oriented sulfonic acid groups and/or salts thereof with an orientation degree of 5-100, which has an excellent adhesiveness, especially excellent anti-alkaline adhesiveness. The present invention also makes it possible to provide a polyester film having, in addition to the excellent adhesiveness, an excellent transparency, antistatic property and waterproof property.
    Type: Grant
    Filed: December 20, 1989
    Date of Patent: September 24, 1991
    Assignee: Toray Industries, Inc.
    Inventors: Kenji Tsunashima, Takashi Mimura, Takashi Sumiya, Hiroshi Kuboyama
  • Polyester film
    Patent number: 4908277
    Abstract: The present invention is directed to a polyester film comprising at least at its surface portion oriented sulfonic acid groups and/or salts thereof with an orientation degree of 5-100, which has an excellent adhesiveness, especially excellent anti-alkaline adhesiveness. The present invention also makes it possible to provide a polyester film having, in addition to the excellent adhesiveness, an excellent transparency, antistatic property and waterproof property.
    Type: Grant
    Filed: March 16, 1988
    Date of Patent: March 13, 1990
    Assignee: Toray Industries, Inc.
    Inventors: Kenji Tsunashima, Takashi Mimura, Takashi Sumiya, Hiroshi Kuboyama