Patents by Inventor Yoshinobu Yukinaga

Yoshinobu Yukinaga 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).

  • Apparatus for molding a formatted substrate for an optical disk
    Patent number: 5171585
    Abstract: Improvement in a method for molding a plastic substrate for an optical disk having a concave-convex pattern on a side surface thereof including a step of feeding liquid resin into a molding cavity defined by a pair of mold halves, characterized in that, when the molded plastic substrate is released from the mold halves, the molded plastic substrate is released at least simultaneously in time from both of the mold halves in a mold-opening stage.
    Type: Grant
    Filed: April 20, 1992
    Date of Patent: December 15, 1992
    Assignee: Daicel Chemical Industries, Ltd.
    Inventors: Yoshio Onisawa, Yoshinobu Yukinaga
  • Method for molding a formatted substrate for an optical disk
    Patent number: 5106553
    Abstract: Improvement in a method for molding a plastic substrate for an optical disk having a concave-convex pattern on a side surface thereof including a step of feeding liquid resin into a molding cavity defined by a pair of mold halves, characterized in that, when the molded plastic substrate is released from the mold halves, the molded plastic substrate is released at least simultaneously in time from both of the mold halves in a mold-opening stage.
    Type: Grant
    Filed: April 17, 1989
    Date of Patent: April 21, 1992
    Assignee: Daicel Chemical Industries, Ltd.
    Inventors: Yoshio Onisawa, Yoshinobu Yukinaga