Patents by Inventor Nagahisa Karube

Nagahisa Karube 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).

  • High-concentration starch adhesive
    Patent number: 5181959
    Abstract: The present invention relates to a high-concentration starch adhesive prepared by treating a starch slurry at a temperature of 100.degree. C. or above to form a gelatinized solution and suspending an ungelatinized starch in the gelatinized solution. According to the present invention, the viscosity of the starch adhesive can be kept stable over a long period of time; the problems such as warp due to the expansion and contraction, by the absorption of water, of the material to be adhered, can be solved; and the quantity of heat necessitated in the adhesion step can be much reduced.
    Type: Grant
    Filed: December 28, 1989
    Date of Patent: January 26, 1993
    Assignee: Honshu Paper Co., Ltd.
    Inventors: Shigeki Nagai, Haruo Sato, Nagahisa Karube
  • Aqueous starch slurry adhesive
    Patent number: 5096491
    Abstract: The present invention relates to a high concentration aqueous starch slurry adhesive comprising 20 to 60% of starch and the following components in the specified amount based on the weight of starch:(1) 0.01 to 1.0% of rhamsan gum or xanthan gum,(2) 1.0 to 3.0% of sodium hydroxide, and(3) if necessary, up to 3% of sodium tetraborate.According to the present invention, a high concentration aqueous starch slurry adhesive can be easily obtained at a single step by merely dispersing starch into cold water while stirring.
    Type: Grant
    Filed: July 16, 1990
    Date of Patent: March 17, 1992
    Assignee: Honshu Paper Co., Ltd.
    Inventors: Shigeki Nagai, Kohei Hamazaki, Nagahisa Karube