Patents by Inventor Yumiko Ohsaka

Yumiko Ohsaka 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).

  • Mask for multiple exposure
    Publication number: 20030059685
    Abstract: A mask for multiple exposure having a plurality of periodic patterns in which a relation 0.5S<D<1.5S is satisfied where S is the spacing between lines of a first periodic pattern of the plurality of periodic patterns and D is the spacing between the first periodic pattern and a second periodic pattern, of the plurality of periodic pattern, juxtaposed to the first periodic pattern with respect to the periodicity direction.
    Type: Application
    Filed: March 14, 2000
    Publication date: March 27, 2003
    Inventor: Yumiko Ohsaka