Patents by Inventor Junkichi Tanaka

Junkichi Tanaka 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 making a paper tube
    Patent number: 4504261
    Abstract: A method of manufacturing spiral winding paper tube, the surface of which is ground, coated with colored synthetic resin and ground again after coating. By this way, paper tube of any length, with variously colored and very smooth surface of appropriate hardness, will be gained continuously and economically.
    Type: Grant
    Filed: December 18, 1981
    Date of Patent: March 12, 1985
    Assignee: Tanaka Shikan Kabushiki Kaisha
    Inventor: Junkichi Tanaka
  • Paper bobbins
    Patent number: 4008860
    Abstract: An improved paper bobbin of such structure that it may be used on a drive spindle for a metal bobbin without alteration to the drive spindle. In the past when paper bobbins have been used, a special drive spindle was required that was not adapted to have metal bobbins mounted thereon.
    Type: Grant
    Filed: April 28, 1975
    Date of Patent: February 22, 1977
    Assignee: Tanaka Paper Tube Co. Ltd.
    Inventor: Junkichi Tanaka