Patents by Inventor Toshio Sekiba

Toshio Sekiba 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 manufacturing thin-plate glass article, method of manufacturing glass substrate for information recording medium, and method of manufacturing magnetic recording medium
    Patent number: 6442975
    Abstract: There are disclosed a method of manufacturing a thin-plate glass having a good flatness with a high mass productivity and a method of manufacturing a high-quality and high-performance glass substrate for an information recording medium and a magnetic recording medium with a high mass productivity. A glass gob is press-formed between upper and lower dies to form a thin-plate glass. The press forming is finished when the inside of the thin-plate glass is at a softening point Ts or a higher temperature. Subsequently, warp modification pressing is performed to modify a warp of the thin-plate glass. The warp modification pressing is finished when the inside of the thin-plate glass is at a transition point Tg or a higher temperature.
    Type: Grant
    Filed: September 8, 1999
    Date of Patent: September 3, 2002
    Assignee: Hoya Corporation
    Inventors: Akira Murakami, Takeo Otagiri, Toshio Sekiba, Shizuo Suzuki, Takumi Yata, Tetsuya Saito, Jun Saito, Katsuya Nagakura, Tomomasa Takeuchi