Patents by Inventor Takahiro Morikawa

Takahiro Morikawa 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).

  • Publication number: 20090302293
    Abstract: On the same semiconductor substrate 1, a memory cell array in which a plurality of memory elements R having a chalcogenide-material storage layer 22 storing a high-resistance state with a high electric resistance value and a low-resistance state with a low electric resistance value by a change of an atom arrangement are disposed in a matrix is formed in a memory cell region mmry, and a semiconductor integrated circuit is formed in a logic circuit region lgc. This chalcogenide-material storage layer 22 is made of a chalcogenide material containing at least either one of Ga or In of 10.5 atom % or larger to 40 atom % or smaller, Ge of 5 atom % or larger to 35 atom % or smaller, Sb of 5 atom % or larger to 25 atom % or smaller, and Te of 40 atom % or larger to 65 atom % or smaller.
    Type: Application
    Filed: November 14, 2006
    Publication date: December 10, 2009
    Inventors: Takahiro Morikawa, Motoyasu Terao, Norikatsu Takaura, Kenzo Kurotsuchi
  • Publication number: 20060105556
    Abstract: The annealing process at 400° C. or more required for the wiring process for a phase change memory has posed the problem in that the crystal grains in a chalcogenide material grow in an oblique direction to cause voids in a storage layer. The voids, in turn, cause peeling due to a decrease in adhesion, variations in resistance due to improper contact with a plug, and other undesirable events. After the chalcogenide material has been formed in an amorphous phase, post-annealing is conducted to form a (111)-oriented and columnarly structured face-centered cubic. This is further followed by high-temperature annealing to form a columnar, hexagonal closest-packed crystal. Use of this procedure makes it possible to suppress the growth of inclined crystal grains that causes voids, since crystal grains are formed in a direction perpendicular to the surface of an associated substrate.
    Type: Application
    Filed: November 15, 2005
    Publication date: May 18, 2006
    Inventors: Yuichi Matsui, Motoyasu Terao, Norikatsu Takaura, Takahiro Morikawa, Naoki Yamamoto
  • Patent number: 5898829
    Abstract: In a computer system comprising first through N-th processors which are provided with first through N-th processor input/output information transmission paths, respectively, an n-th processor is connected to an (n-1)-th processor, an (n-2)-th processor, an (n+1)-th processor, and an (n+2)-th processor, where n represents each of 1 through N, both inclusive. Coupled to the first through the N-th processor input/output information transmission paths and to a system input/output information transmission path for a controlled system, an input/output information path control device connects the system input/output information transmission path to one of the first through the N-th processor input/output information transmission paths.
    Type: Grant
    Filed: November 27, 1996
    Date of Patent: April 27, 1999
    Assignee: NEC Corporation
    Inventor: Takahiro Morikawa
  • Patent number: 5630053
    Abstract: In a computer system comprising first through N-th processors which are provided with first through N-th processor input/output information transmission paths, respectively, an n-th processor is connected to an (n-1)-th processor, an (n-2)-th processor, an (n+1)-th processor, and an (n+2)-th processor, where n represents each of 1 through N, both inclusive. Coupled to the first through the N-th processor input/output information transmission paths and to a system input/output information transmission path for a controlled system, an input/output information path control device connects the system input/output information transmission path to one of the first through the N-th processor input/output information transmission paths.
    Type: Grant
    Filed: March 22, 1995
    Date of Patent: May 13, 1997
    Assignee: NEC Corporation
    Inventor: Takahiro Morikawa