Patents by Inventor Masahura Sakamoto

Masahura Sakamoto 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: 8056026
    Abstract: The manufacturability of a lithographic mask employed in fabricating instances of a semiconductor device is determined. Target edges are selected from mask layout data of the lithographic mask. The mask layout data includes polygons distributed over cells, where each polygon has edges. The cells include a center cell, two vertical cells above and below the center cell, and two horizontal cells to the left and right of the center cell. Target edge pairs are selected for determining a manufacturing penalty in making the lithographic mask, in a manner that decreases the computational volume in determining the manufacturing penalty. The manufacturability of the lithographic mask, including the manufacturing penalty in making the lithographic mask, is determined based on the target edge pairs selected. The manufacturability of the lithographic mask is output. The manufacturability of the lithographic mask is dependent on the manufacturing penalty in making the lithographic mask.
    Type: Grant
    Filed: December 14, 2008
    Date of Patent: November 8, 2011
    Assignee: International Business Machines Corporation
    Inventors: Tadanobu Inoue, David O. Melville, Hidemasa Muta, Kehan Tian, Masahura Sakamoto, Alan E. Rosenbluth
  • Patent number: 8056023
    Abstract: The manufacturability of a lithographic mask employed in fabricating instances of a semiconductor device is determined. Target edge pairs are selected from mask layout data of the lithographic mask to determine a manufacturing penalty in making the lithographic mask. The mask layout data includes polygons, where each polygon has edges, and where each target edge pair is defined by two of the edges of one or more of the polygons. The number of the target edge pairs is reduced to decrease computational volume in determining the manufacturing penalty in making the lithographic mask. The manufacturability of the lithographic mask, including the manufacturing penalty in making the lithographic mask, is determined based on the target edge pairs as reduced in number. The manufacturability of the lithographic mask is output. The manufacturability of the lithographic mask is dependent on the manufacturing penalty in making the lithographic mask.
    Type: Grant
    Filed: December 14, 2008
    Date of Patent: November 8, 2011
    Assignee: International Business Machines Corporation
    Inventors: Tadanobu Inoue, David O. Melville, Hidemasa Muta, Kehan Tian, Masahura Sakamoto, Alan E. Rosenbluth