Patents by Inventor Shougo Yagi

Shougo Yagi 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).

  • Multi-layered holographic read-only memory and data retrieval method
    Patent number: 7570567
    Abstract: An inexpensive multi-layered holographic read-only memory having a large capacity is provided. In the memory in which single-mode slab waveguides are multi-layered, a periodic scattering center whose period approximately agrees with the period of the guided mode is provided in at least one of a core layer and a clad layer in each waveguide so that a guided wave in the waveguide is diffracted by the periodic scattering center to the outside of the waveguide and a holographic image is generated.
    Type: Grant
    Filed: September 30, 2004
    Date of Patent: August 4, 2009
    Assignee: Nippon Telegraph and Telephone
    Inventors: Shougo Yagi, Tadayuki Imai, Michio Ono, Hiroki Yamazaki, Haruki Kozawaguchi
  • Multi-layered holographic read-only memory and data retrieval method
    Publication number: 20050041557
    Abstract: An inexpensive multi-layered holographic read-only memory having a large capacity is provided. In the memory in which single-mode slab waveguides are multi-layered, a periodic scattering center whose period approximately agrees with the period of the guided mode is provided in at least one of a core layer and a clad layer in each waveguide so that a guided wave in the waveguide is diffracted by the periodic scattering center to the outside of the waveguide and a holographic image is generated.
    Type: Application
    Filed: September 30, 2004
    Publication date: February 24, 2005
    Inventors: Shougo Yagi, Tadayuki Imai, Michio Ono, Hiroki Yamazaki, Haruki Kozawaguchi
  • Multi-layered holographic read-only memory and data retrieval method
    Patent number: 6811728
    Abstract: An inexpensive multi-layered holographic read-only memory having a large capacity is provided. In the memory in which single-mode slab waveguides are multi-layered, a periodic scattering center whose period approximately agrees with the period of the guided mode is provided in at least one of a core layer and a clad layer in each waveguide so that a guided wave in the waveguide is diffracted by the periodic scattering center to the outside of the waveguide and a holographic image is generated.
    Type: Grant
    Filed: February 24, 2003
    Date of Patent: November 2, 2004
    Assignee: Nippon Telegraph & Telephone Corporation
    Inventors: Shougo Yagi, Tadayuki Imai, Michio Ono, Hiroki Yamazaki, Haruki Kozawaguchi
  • Multi-layered holographic read-only memory and data retrieval method
    Publication number: 20030161247
    Abstract: An inexpensive multi-layered holographic read-only memory having a large capacity is provided. In the memory in which single-mode slab waveguides are multi-layered, a periodic scattering center whose period approximately agrees with the period of the guided mode is provided in at least one of a core layer and a clad layer in each waveguide so that a guided wave in the waveguide is diffracted by the periodic scattering center to the outside of the waveguide and a holographic image is generated.
    Type: Application
    Filed: February 24, 2003
    Publication date: August 28, 2003
    Applicant: Nippon Telegraph and Telephone Corporation
    Inventors: Shougo Yagi, Tadayuki Imai, Michio Ono, Hiroki Yamazaki, Haruki Kozawaguchi
  • Multi-layered holographic read-only memory and data retrieval method
    Patent number: 6556531
    Abstract: An inexpensive multi-layered holographic read-only memory having a large capacity is provided. In the memory in which single-mode slab waveguides are multi-layered, a periodic scattering center whose period approximately agrees with the period of the guided mode is provided in at least one of a core layer and a clad layer in each waveguide so that a guided wave in the waveguide is diffracted by the periodic scattering center to the outside of the waveguide and a holographic image is generated.
    Type: Grant
    Filed: February 16, 1999
    Date of Patent: April 29, 2003
    Assignee: Nippon Telegraph and Telephone Corporation
    Inventors: Shougo Yagi, Tadayuki Imai, Michio Ono, Hiroki Yamazaki, Haruki Kozawaguchi