Patents by Inventor Hideki Tarumoto

Hideki Tarumoto 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: 5455145
    Abstract: A method for forming a resist pattern using a double-layer resist. A substrate is prepared and then, a novolak i-line photoresist layer not photosensitive to a g-line but photosensitive to an i-line is formed on this substrate as a lower layer resist, by solving the novolak i-line photoresist in a first solvent. A novolak g-line photoresist layer photosensitive to the g-line in which a compound absorbing i-line is mixed is formed on this novolak i-line photoresist layer as an upper layer resist, by solving the novolak g-line photoresist in a second solvent to which is added a poor solvent in which the novolak i-line photoresist is substantially insoluble. Then, the upper layer resist is irradiated with the g-line using a mask and a pattern of this upper layer resist is formed by development. Thereafter, the whole surface of the substrate is irradiated with the i-line using this upper layer resist pattern as a mask to pattern the lower layer resist.
    Type: Grant
    Filed: March 25, 1994
    Date of Patent: October 3, 1995
    Assignee: Mitsubishi Denki Kabushiki Kaisha
    Inventor: Hideki Tarumoto