Patents by Inventor Inui Tetsuya

Inui Tetsuya 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).

  • Patent number: 5246531
    Abstract: A method of fabricating a glass substrate for a disk including guide track portions and sector (or track) address portions of which grooves and pits have different depths, providing the steps of (i) forming a photoresist film over a glass substrate for an optical memory element, (ii) carrying out exposure to define a plurality of guide track portion formation areas and sector (or track) address portion formation areas interposed between the guide track portion formation areas, and carrying out development so as to cause the glass substrate in the address portion formation area to appear and to cause the photoresist film in the guide track portion formation area to remain as a first residual film, (iii) carrying out first etching to sink the glass substrate in the address portion formation area by a predetermined thickness such that a pit is formed and to remove the surface layer of the first residual film such that a second residual film is formed, (iv) carrying out first ashing to remove the second residual
    Type: Grant
    Filed: March 11, 1992
    Date of Patent: September 21, 1993
    Assignee: Sharp Kabushiki Kaisha
    Inventors: Hirokane Junji, Inui Tetsuya, Mieda Michinobu, Ohta Kenji