Patents by Inventor Naotaka Nakaji

Naotaka Nakaji 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 using porcelain block in porcelain press technique for dental use
    Patent number: 4913860
    Abstract: A homogeneous porcelain block is used instead of using porcelain powder in a porcelain press technique to make dental prosthesis. Porcelain block is placed directly onto a mold, and softened by heating. Then the upper and the lower flasks of the mold assembly are closed so as to press the porcelain block. The process prevents adverse effects from steam and gases during the procedure. Therefore the porcelain block eliminates discoloration, bubbles, uneven baking and weakness in the porcelain block. In addition, considerable time and labor may be saved.
    Type: Grant
    Filed: July 22, 1988
    Date of Patent: April 3, 1990
    Inventors: Naotaka Nakaji, Kisao Nakaji