Patents by Inventor Makoto Hamamura

Makoto Hamamura 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).

  • Composite optical disk with structure for preventing adhesive from leaking into the center hole
    Patent number: 5956317
    Abstract: A composite optical disk structure includes a first transparent disk plate having a first center hole, a first stamper clamp groove and a first information recording area on its one main surface; a second transparent disk plate having a second center hole having a diameter equal to that of the first center hole, a second stamper clamp groove and a second information recording area on its one main surface; a transparent adhesive sandwiched between the first and second transparent disk plates to bond the one main surfaces of them; and a mechanism formed between the one main surfaces for preventing the transparent adhesive from leaking our into the center holes.
    Type: Grant
    Filed: July 26, 1996
    Date of Patent: September 21, 1999
    Assignee: Toshiba-Emi Limited
    Inventors: Takeshi Komiyama, Makoto Hamamura