Patents by Inventor Sinichi Tezuka

Sinichi Tezuka 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).

  • Optical recording medium
    Patent number: 5161150
    Abstract: An optical recording disk intended for use as an additionally recordable CD is provided. It has a substrate, a dye or recording layer on the substrate, and a reflective layer and a protective layer disposed on the recording layer in a close contact relationship. Recording is carried out by directing recording light to the recording layer to form a pit and reproduction is carried out by directing reproducing light to the pit. A layer containing a decomposition product of the dye or recording material, but substantially free of the substrate material is present at the interface between the substrate and the recording layer where the pit is formed.
    Type: Grant
    Filed: March 1, 1990
    Date of Patent: November 3, 1992
    Assignee: TDK Corporation
    Inventors: Kenryo Namba, Masahiro Shinkai, Sinichi Tezuka, Tetsushi Inoue, Toshiki Aoi, Suguru Takayama