Patents by Inventor Hirofumi Tsuka

Hirofumi Tsuka 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).

  • Recording material
    Patent number: 5178944
    Abstract: A recording material comprising a base material and at least one polymer selected from the group consisting of a homopolymer of diallylamine, copolymers of diallyamine with (meth)acrylamide and optionally at least one other vinyl monomer having substantially no carboxyl group, and salts thereof which is contained in said base material or in a coating layer formed on said base material, on which an ink is printed with good initial coloring property and a printed image with higher resolution and improved water and light resistance.
    Type: Grant
    Filed: April 19, 1988
    Date of Patent: January 12, 1993
    Assignee: Sumitomo Chemical Co., Ltd.
    Inventors: Hiroshi Horiuchi, Hirofumi Tsuka, Nobuyuki Matsuda