Patents by Inventor Tadao Sunaga

Tadao Sunaga 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).

  • Electric punch
    Patent number: 4579029
    Abstract: An electric punch wherein lower blades each are formed in the bottom part of each insertion concavity into which sheets of paper being punched are inserted sideways, and a plurality of elevatable upper blades are formed, each upper blade being lowered into the corresponding lower blade by a solenoid excited in sequence.
    Type: Grant
    Filed: August 16, 1984
    Date of Patent: April 1, 1986
    Assignee: Maruzen Kabushiki Kaisha
    Inventor: Tadao Sunaga